Portola Valley Warnings, Watches and Advisories

Do not drive vehicles through flooded areas. The water depth or fast flowing water/mud/debris from a flash flood will make road conditions unsafe. Do not rely soley on data presented here or other third-party websites - always check your official national and local weather service agency website, socials, radio and/or TV stations for making critical decisions related to weather events.

Please carefully read each posted Warning and Alert as it relates to the area(s) being affected. We may provide a wider range of issued severe weather warnings for surrounding cities and counties, so some alerts may not directly impact this location. This is done to help with preparing for severe weather that may overlap or be heading towards Portola Valley.

Use the Radar Maps link provided to understand the trajectory of a storm.

Flood Advisory issued November 21 at 9:33AM PST until November 21 at 1:30PM PST by NWS Eureka CA

* WHAT...Flooding caused by excessive rainfall is expected. * WHERE...A portion of northwest California, including the following counties, southern Humboldt and Mendocino. * WHEN...Until 130 PM PST. * IMPACTS...Minor flooding in low-lying and poor drainage areas. Rises in small streams and normally dry arroyos. Overflowing poor drainage areas. River or stream flows are elevated. * ADDITIONAL DETAILS... - At 933 AM PST, Doppler radar indicated heavy rain. Minor flooding is ongoing or expected to begin shortly in the advisory area. Between 2 and 4 inches of rain have fallen and rainfall rates are very heavy from 0.3 to 0.6 inches per hour are being recorded - Additional rainfall amounts of 2 to 4 inches are expected over the area. This additional rain will result in minor flooding and the situation may evolve quickly to a greater flood threat. - Some locations that will experience flooding include... Arcata, Fort Bragg, Willits, Point Arena, Richardson Grove State Park, Garberville, Laytonville, Shelter Cove, Honeydew, Albion, Grizzly Creek Redwoods State Park, Willow Creek, Leggett, Rockport, Richardson Grove, Whitehorn, Redway, Alderpoint, Myers Flat and Weott. - http://www.weather.gov/safety/flood

Flood Warning issued November 21 at 8:51AM PST until November 22 at 1:00PM PST by NWS Eureka CA

...The National Weather Service in Eureka CA has issued a Flood Warning for the following rivers in California... Van Duzen River Near Bridgeville affecting Humboldt County. For the Van Duzen, Bridgeville...Minor flooding is forecast. * WHAT...Minor flooding is forecast. * WHERE...Van Duzen River near Bridgeville. * WHEN...From late tonight to early tomorrow afternoon. * IMPACTS...At 17.0 feet, Flooding begins in lower portions of Grizzly Creek State Park and along River Bar Road. * ADDITIONAL DETAILS... - At 8:15 AM PST Thursday the stage was 10.5 feet. - Bankfull stage is 17.0 feet. - Forecast...The river is expected to rise above flood stage late tonight to a crest of 17.1 feet tomorrow morning. It will then fall below flood stage tomorrow morning. - Flood stage is 17.0 feet. - Flood History...This crest compares to a previous crest of 17.1 feet on 01/18/2016. - http://www.weather.gov/safety/flood

Flood Warning issued November 21 at 8:40AM PST until November 22 at 6:00PM PST by NWS Eureka CA

...The National Weather Service in Eureka CA has issued a Flood Warning for the following rivers in California... Russian River near Hopland affecting Mendocino County. Navarro River at Navarro affecting Mendocino County. Mad River near Arcata affecting Humboldt County. Eel River at Fernbridge affecting Humboldt County. For the Russian River...including Hopland...Minor flooding is forecast. For the Navarro River...including Navarro...Minor flooding is forecast. For the Mad River...including Arcata...Minor flooding is forecast. For the Eel River...including Fernbridge...Major flooding is forecast. * WHAT...Minor flooding is forecast. * WHERE...Mad River near Arcata. * WHEN...From Friday morning to tomorrow evening. * IMPACTS...At 22.0 feet, Significant flooding of portions of Mad River Beach Road. Water may flow across roads to Tyee City. Flood impacts will be aggravated by high tides and strong, onshore winds. * ADDITIONAL DETAILS... - At 8:00 AM PST Thursday the stage was 17.2 feet. - Bankfull stage is 22.0 feet. - Forecast...The river will rise to 17.8 feet late this morning. It will then fall to 16.6 feet this evening. It will rise above flood stage tomorrow morning to 22.4 feet late tomorrow morning. It will then fall below flood stage late tomorrow morning to 13.9 feet Saturday evening. It will rise to 14.3 feet early Sunday morning. It will then fall again and remain below flood stage. - Flood stage is 22.0 feet. - Flood History...This crest compares to a previous crest of 22.3 feet on 12/30/2022. - http://www.weather.gov/safety/flood

Flood Warning issued November 21 at 8:40AM PST until November 22 at 11:00PM PST by NWS Eureka CA

...The National Weather Service in Eureka CA has issued a Flood Warning for the following rivers in California... Russian River near Hopland affecting Mendocino County. Navarro River at Navarro affecting Mendocino County. Mad River near Arcata affecting Humboldt County. Eel River at Fernbridge affecting Humboldt County. For the Russian River...including Hopland...Minor flooding is forecast. For the Navarro River...including Navarro...Minor flooding is forecast. For the Mad River...including Arcata...Minor flooding is forecast. For the Eel River...including Fernbridge...Major flooding is forecast. * WHAT...Minor flooding is forecast. * WHERE...Navarro River at Navarro. * WHEN...From this evening to late tomorrow evening. * IMPACTS...At 30.0 feet, Water will flow over the south bank of the river approximately 1 mile east of Highway 1, and begins to flood property in this area including six homes. Expect closure of Highway 128. Motorists should use alternate routes. * ADDITIONAL DETAILS... - At 8:15 AM PST Thursday the stage was 13.4 feet. - Forecast...The river will rise above flood stage this evening to 28.3 feet late tomorrow morning. It will then fall below flood stage tomorrow afternoon to 10.8 feet early Sunday morning. It will rise to 10.9 feet early Sunday morning. It will then fall again and remain below flood stage. - Flood stage is 23.0 feet. - Flood History...This crest compares to a previous crest of 29.5 feet on 02/07/2015. - http://www.weather.gov/safety/flood

Flood Warning issued November 21 at 8:40AM PST until November 23 at 5:00AM PST by NWS Eureka CA

...The National Weather Service in Eureka CA has issued a Flood Warning for the following rivers in California... Russian River near Hopland affecting Mendocino County. Navarro River at Navarro affecting Mendocino County. Mad River near Arcata affecting Humboldt County. Eel River at Fernbridge affecting Humboldt County. For the Russian River...including Hopland...Minor flooding is forecast. For the Navarro River...including Navarro...Minor flooding is forecast. For the Mad River...including Arcata...Minor flooding is forecast. For the Eel River...including Fernbridge...Major flooding is forecast. * WHAT...Minor flooding is forecast. * WHERE...Russian River near Hopland. * WHEN...From this evening to early Saturday morning. * IMPACTS...At 18.0 feet, Flooding of Highway 222 near Ukiah. Secondary roads in low-lying areas will be flooded in the Hopland, Ukiah, and Talmage areas. * ADDITIONAL DETAILS... - At 8:00 AM PST Thursday the stage was 9.1 feet. - Bankfull stage is 21.0 feet. - Forecast...The river will rise above flood stage this evening to 16.2 feet just after midnight tonight. It will then fall late tonight. It will rise to 18.2 feet early tomorrow afternoon. It will then fall below flood stage tomorrow afternoon to 6.1 feet late Sunday morning. It will rise to 8.2 feet early Tuesday morning. It will then fall again and remain below flood stage. - Flood stage is 15.0 feet. - Flood History...This crest compares to a previous crest of 18.2 feet on 03/09/1995. - http://www.weather.gov/safety/flood

Flood Warning issued November 21 at 8:40AM PST until November 23 at 4:00PM PST by NWS Eureka CA

...The National Weather Service in Eureka CA has issued a Flood Warning for the following rivers in California... Russian River near Hopland affecting Mendocino County. Navarro River at Navarro affecting Mendocino County. Mad River near Arcata affecting Humboldt County. Eel River at Fernbridge affecting Humboldt County. For the Russian River...including Hopland...Minor flooding is forecast. For the Navarro River...including Navarro...Minor flooding is forecast. For the Mad River...including Arcata...Minor flooding is forecast. For the Eel River...including Fernbridge...Major flooding is forecast. * WHAT...Major flooding is forecast. * WHERE...Eel River at Fernbridge. * WHEN...From this evening to Saturday afternoon. * IMPACTS...At 25.0 feet, Severe flooding of the Eel River Delta including areas northwest of Loleta and the western portion of Cannibal Island Road. Numerous road closures in low-lying areas, including Highway 211 to Ferndale. A Special Action Advisory is issued to all owners of livestock in low-lying areas near the river. Appropriate action should be taken to protect livestock. * ADDITIONAL DETAILS... - At 8:15 AM PST Thursday the stage was 10.7 feet. - Bankfull stage is 20.0 feet. - Forecast...The river is expected to rise above flood stage this evening to a crest of 25.3 feet early tomorrow afternoon. It will then fall below flood stage late Saturday morning. - Flood stage is 20.0 feet. - Flood History...This crest compares to a previous crest of 25.3 feet on 01/09/1995. - http://www.weather.gov/safety/flood

Flood Advisory issued November 21 at 7:59AM PST until November 21 at 11:00AM PST by NWS Eureka CA

* WHAT...Flooding caused by excessive rainfall is expected. * WHERE...Portions of central and northwest California, including the following counties, in central California, northwestern Lake. In northwest California, northeastern Mendocino. * WHEN...Until 1100 AM PST. * IMPACTS...Minor flooding in low-lying and poor drainage areas. Overflowing poor drainage areas. River or stream flows are elevated. There will be an increased risk of rock and land slides along roadways. * ADDITIONAL DETAILS... - At 759 AM PST, Doppler radar indicated heavy rain. Minor flooding is ongoing or expected to begin shortly in the advisory area. Between 3 and 5 inches of rain have fallen. - Additional rainfall amounts of 1 to 3 inches are expected over the area. This additional rain will result in minor flooding. - Some locations that will experience flooding include... Covelo and Gravelly Valley Airport. - http://www.weather.gov/safety/flood

Winter Storm Watch issued November 21 at 7:52AM PST until November 26 at 4:00PM PST by NWS Sacramento CA

* WHAT...Heavy snow possible. Total snow accumulations between 1 and 4 feet possible from Friday afternoon through Tuesday afternoon. Winds could gust as high as 50 mph. * WHERE...West Slope Northern Sierra Nevada and Western Plumas County/Lassen Park Counties. * WHEN...From Friday afternoon through Tuesday afternoon. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the morning and evening commutes. Gusty winds could bring down tree branches. * ADDITIONAL DETAILS...Snow levels around 6000-7000 feet this morning, rising through the day and into Friday. Snow levels Friday afternoon around 6000-7000 feet, lowering to around 4500-5500 feet over the weekend. A brief break in snowfall will be possible from late Saturday afternoon into the overnight period with lighter snowfall amounts.

Flood Advisory issued November 21 at 7:28AM PST until November 23 at 3:15AM PST by NWS San Francisco CA

* WHAT...Urban area and small stream flooding caused by excessive rainfall continues. * WHERE...All of Marin, Sonoma, and Napa Counties. * WHEN...Until 315 AM PST Saturday. * IMPACTS...Minor flooding in low-lying and poor drainage areas. Water over roadways. Overflowing poor drainage areas. * ADDITIONAL DETAILS... - At 723 AM PST, Doppler radar and automated rain gauges indicated heavy rain. This is causing urban and small stream flooding. Between 3 and 12 inches of rain have fallen. - Green Valley Road near Sebastopol, Trenton Healdsburg Road near Forestville, and Mark West Station Road near Windsor are the most likely place to experience minor flooding and are closed due to water over the roadway. Additional rainfall amounts of 2 to 7 inches are expected over the area. This additional rain will result in minor flooding. - Some locations that will experience flooding include... Santa Rosa, Napa, Petaluma, San Rafael, Novato, Rohnert Park, Windsor, American Canyon, Mill Valley, San Anselmo, Larkspur, Healdsburg, Sonoma, Corte Madera, Tiburon, Cloverdale, Fairfax, Sebastopol, Cotati and Sausalito. - http://www.weather.gov/safety/flood

Flood Advisory issued November 21 at 7:11AM PST until November 21 at 10:15AM PST by NWS Eureka CA

* WHAT...Urban area and small stream flooding caused by excessive rainfall is expected. * WHERE...Portions of central and northwest California, including the following counties, in central California, Lake. In northwest California, southeastern Mendocino. * WHEN...Until 1015 AM PST. * IMPACTS...Minor flooding in low-lying and poor drainage areas. Overflowing poor drainage areas. * ADDITIONAL DETAILS... - At 711 AM PST, Doppler radar indicated heavy rain. This will cause urban and small stream flooding. Between 2.5 and 4 inches of rain have fallen. - Additional rainfall amounts of 1 to 3 inches are expected over the area. This additional rain will result in minor flooding. - Some locations that will experience flooding include... Ukiah, Lakeport, Upper Lake, Ukiah Municipal Airport, Middletown, Clearlake, Finley, North Lakeport, Soda Bay, Mount Konocti, Knobcone Camp, Glenhaven, Konocti Bay, Saratoga Springs, Witter Springs, Loch Lomond, Adams, Hopland, Hobergs and Seigler Springs. - http://www.weather.gov/safety/flood

Wind Advisory issued November 21 at 7:02AM PST until November 22 at 4:00AM PST by NWS Eureka CA

* WHAT...South winds 20 to 30 mph with gusts up to 60 mph expected. Up to 70 mph over the more prominent ridges. * WHERE...Humboldt County. * WHEN...From 4 PM this afternoon to 4 AM PST Friday. * IMPACTS...Wind gusts will be particularly strong along windward ridges and exposed coastal headlands.

Wind Advisory issued November 21 at 7:02AM PST until November 22 at 4:00AM PST by NWS Eureka CA

* WHAT...South winds 20 to 30 mph with gusts up to 55 mph. * WHERE...Mendocino Coast. * WHEN...Until 4 AM PST Friday. * IMPACTS...Wind gusts will be particularly strong along windward ridges and exposed coastal headlands. There is an increased risk of tree branches and other debris on roadways. Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

High Wind Warning issued November 21 at 7:02AM PST until November 22 at 4:00AM PST by NWS Eureka CA

* WHAT...South winds 20 to 30 mph with gusts up to 65 mph expected. * WHERE...Del Norte County. * WHEN...From 4 PM this afternoon to 4 AM PST Friday. * IMPACTS...Damaging winds will blow down trees and power lines. Widespread power outages are expected. Travel will be difficult, especially for high profile vehicles.

Flood Advisory issued November 21 at 6:56AM PST until November 21 at 10:00AM PST by NWS Eureka CA

* WHAT...Flooding caused by excessive rainfall is expected. * WHERE...A portion of northwest California, including the following county, northwestern Humboldt. * WHEN...Until 1000 AM PST. * IMPACTS...Minor flooding in low-lying and poor drainage areas. Water over roadways. Overflowing poor drainage areas. * ADDITIONAL DETAILS... - At 656 AM PST, Doppler radar indicated heavy rain. Overflowing poor drainage areas will cause minor flooding in the advisory area. Between 1.5 and 3 inches of rain have fallen. - Additional rainfall amounts of 1 to 3 inches are expected over the area. This additional rain will result in minor flooding. - Some locations that will experience flooding include... Eureka, Arcata, Orick, Fortuna, Rio Dell, Trinidad, McKinleyville, Westhaven-Moonstone, Carlotta, Scotia, Ferndale, Blue Lake, Myrtletown, Samoa, Cutten, Bayview, Freshwater, Fairhaven, Pine Hills and Humboldt Hill. - http://www.weather.gov/safety/flood

Flood Watch issued November 21 at 5:56AM PST until November 23 at 4:00AM PST by NWS San Francisco CA

* WHAT...Flooding caused by excessive rainfall is expected * WHERE...The North Bay. * WHEN...Through late Friday night. * IMPACTS...Creeks and streams may rise out of their banks. Flooding may occur in poor drainage and urban areas. Low-water crossings may be flooded. * ADDITIONAL DETAILS... - Light to moderate rain is continuing across the watch area. Two to four inches of rain have already fallen in the valley regions with up to six inches of rain in the higher elevations. Areas of the Sonoma County valleys have already reported minor flooding and road closures. - http://www.weather.gov/safety/flood

Flood Watch issued November 21 at 5:21AM PST until November 22 at 10:00PM PST by NWS Eureka CA

* WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...A portion of northwest California, including Coastal Del Norte and Del Norte Interior. * WHEN...Through Friday evening. * IMPACTS...There will be an increased risk of rock and land slides along roadways. Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. Flooding may occur in poor drainage and urban areas. Low-water crossings may be flooded. Storm drains and ditches may become clogged with debris. Extensive street flooding and flooding of creeks and rivers are possible. Area creeks and streams are running high and could flood with more heavy rain. * ADDITIONAL DETAILS... - An additional 0.5 to 2 inches of rain is expected to fall tonight and early Thursday. Then heavier rain is expected again with an additional 2 to 5 inches possible Thursday afternoon and Thursday night. Additional light rain expected to continue Friday. - http://www.weather.gov/safety/flood

Flood Watch issued November 21 at 5:21AM PST until November 22 at 10:00PM PST by NWS Eureka CA

* WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...A portion of northwest California, including Southern Trinity, with highest amounts expected to the southwest of South Fork Mtn. * WHEN...Through Friday evening. * IMPACTS...There will be an increased risk of rock and land slides along roadways. Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. Flooding may occur in poor drainage and urban areas. Low-water crossings may be flooded. Storm drains and ditches may become clogged with debris. Extensive street flooding and flooding of creeks and rivers are possible. Area creeks and streams are running high and could flood with more heavy rain. * ADDITIONAL DETAILS... - An additional 5 to 10 inches of rain is expected to fall mainly tonight and Thursday with occasional light rain on Friday. - http://www.weather.gov/safety/flood

Flood Watch issued November 21 at 5:21AM PST until November 22 at 10:00PM PST by NWS Eureka CA

* WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...A portion of northwest California, including the following areas, Northern Lake and Southern Lake. * WHEN...Through Friday evening. * IMPACTS...There will be an increased risk of rock and land slides along roadways. Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. Flooding may occur in poor drainage and urban areas. Low-water crossings may be flooded. Storm drains and ditches may become clogged with debris. Extensive street flooding and flooding of creeks and rivers are possible. Area creeks and streams are running high and could flood with more heavy rain. * ADDITIONAL DETAILS... - An additional 3 to 7 inches is expected to fall tonight through Friday. - http://www.weather.gov/safety/flood

Flood Watch issued November 21 at 5:21AM PST until November 22 at 10:00PM PST by NWS Eureka CA

* WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...A portion of northwest California, including the Mendocino Coast, Northeastern Mendocino Interior, Northwestern Mendocino Interior, Southeastern Mendocino Interior and Southwestern Mendocino Interior. * WHEN...Through Friday evening. * IMPACTS...There will be an increased risk of rock and land slides along roadways. Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. Flooding may occur in poor drainage and urban areas. Low-water crossings may be flooded. Storm drains and ditches may become clogged with debris. Extensive street flooding and flooding of creeks and rivers are possible. Area creeks and streams are running high and could flood with more heavy rain. * ADDITIONAL DETAILS... - An additional 4 to 10 inches of rain is expected to fall tonight through early Friday. - http://www.weather.gov/safety/flood

Flood Watch issued November 21 at 5:21AM PST until November 22 at 10:00PM PST by NWS Eureka CA

* WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...A portion of northwest California, including the Northern Humboldt Coast, Northern Humboldt Interior, Southern Humboldt Interior and Southwestern Humboldt. * WHEN...Through Friday evening. * IMPACTS...There will be an increased risk of rock and land slides along roadways. Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. Flooding may occur in poor drainage and urban areas. Low-water crossings may be flooded. Storm drains and ditches may become clogged with debris. Extensive street flooding and flooding of creeks and rivers are possible. Area creeks and streams are running high and could flood with more heavy rain. * ADDITIONAL DETAILS... - An additional 3 to 10 inches of rain is expected to fall tonight tonight through Friday morning. The heaviest amounts will be in the King Range. Additional light rain expected to continue Friday. - http://www.weather.gov/safety/flood

Winter Storm Warning issued November 21 at 3:25AM PST until November 23 at 10:00PM PST by NWS Reno NV

* WHAT...Heavy snow for Mono County above 7000 feet. Snow accumulations of 10 to 18 inches with isolated amounts up to 2 feet. Ridge winds gusting as high as 85 mph. * WHERE...Mono County. * WHEN...From 4 PM Friday to 10 PM PST Saturday. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the Friday evening commute. Very strong winds could cause extensive damage to trees and power lines.

Winter Storm Warning issued November 21 at 3:25AM PST until November 23 at 10:00PM PST by NWS Reno NV

* WHAT...Heavy snow. Snow accumulations between 1 to 2 feet above 7,000 feet with 2 to 6 inches below 7,000 feet. Ridge winds gusting as high as 75 mph. * WHERE...Greater Lake Tahoe Area, and Lassen-Eastern Plumas-Eastern Sierra Counties. * WHEN...From 10 AM Friday to 10 PM PST Saturday. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the Friday evening commute. Very strong winds could cause extensive damage to trees and power lines.

Winter Storm Watch issued November 21 at 3:17AM PST until November 26 at 4:00PM PST by NWS Hanford CA

* WHAT...Heavy snow possible above 7000 feet. Total snow accumulations between 10 and 18 inches possible. Winds could gust as high as 50 mph. * WHERE...A portion of central California across the Sierra Nevada. * WHEN...From Friday afternoon through Tuesday afternoon. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the Friday evening and Monday morning commutes as roads become slick and snow covered. Gusty winds could bring down tree branches.

Beach Hazards Statement issued November 21 at 2:55AM PST until November 22 at 6:00AM PST by NWS San Francisco CA

* WHAT...A moderate period northwest swell will result in a more energetic surf zone and an increased risk of sneaker waves and rip currents. Breaking waves of 10 to 13 ft are expected with some potential for breaking waves up to 15 ft to develop. * WHERE...Northern Monterey Bay County. * WHEN...Through late Thursday night. * IMPACTS...Dangerous swimming and surfing conditions. Large waves can sweep across the beach without warning, pulling people into the sea from rocks, jetties, and beaches. Sudden immersion in cold water can result in cold water shock even for the most experienced swimmers. Cold water shock can result in dramatic changes in breathing, heart rate and blood pressure, greatly increasing the risk of drowning in rough open waters.

High Surf Advisory issued November 21 at 2:55AM PST until November 22 at 6:00AM PST by NWS San Francisco CA

* WHAT...Large breaking waves between 14 to 19 ft along southwest facing beaches and between 19 to 22 ft along well exposed west facing beaches. * WHERE...San Francisco, Coastal North Bay Including Point Reyes National Seashore, San Francisco Peninsula Coast and Southern Monterey Bay and Big Sur Coast Counties. * WHEN...Until 6 AM PST Friday. * IMPACTS...Dangerous swimming and surfing conditions and localized beach erosion. Large waves can sweep across the beach without warning, pulling people into the sea from rocks, jetties and beaches. Sudden immersion in cold water can result in cold water shock even for the most experienced swimmers. Cold water shock can result in dramatic changes in breathing, heart rate and blood pressure, greatly increasing the risk of drowning in rough open waters.

Flood Watch issued November 21 at 2:51AM PST until November 23 at 2:00AM PST by NWS Eureka CA

...The Flood Watch is extended for the following rivers in California... Russian River near Hopland affecting Southeastern Mendocino Interior zone. For the Russian River...including Hopland...flooding is possible. * WHAT...Flooding is possible. * WHERE...Russian River near Hopland. * WHEN...From Friday morning to early Saturday morning. * IMPACTS...At 15.0 feet, Flooding of Highway 175 is expected at the approaches to the Russian River bridge. Expect flooding of cropland on the right bank of river. * ADDITIONAL DETAILS... - At 12:45 AM PST Thursday the stage was 3.6 feet. - Forecast...Flood stage may be reached early tomorrow afternoon. - Flood stage is 15.0 feet. - http://www.weather.gov/safety/flood

Winter Storm Warning issued November 21 at 2:40AM PST until November 21 at 10:00PM PST by NWS Eureka CA

* WHAT...Heavy snow expected above 3, 500 feet. Additional snow accumulations between 1 and 2 feet. * WHERE...Northeastern Trinity. * WHEN...Until 10 PM PST this evening. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. The strong winds and weight of snow on tree limbs may down power lines and could cause sporadic power outages. Travel could be very difficult to impossible. Tire chains may be necessary if travelling through mountain passes. * ADDITIONAL DETAILS...This includes highway 3 at Scott Mountain Pass.

High Wind Warning issued November 21 at 2:12AM PST until November 22 at 10:00AM PST by NWS Medford OR

* WHAT...For the High Wind Warning, south winds 25 to 40 mph with gusts up to 65 mph. For the Wind Advisory, south winds 20 to 30 mph with gusts up to 50 mph. * WHERE...For the high wind warning. Portions of Lake and Modoc counties and far eastern Klamath County, including Lakeview, Valley Falls, Bly, Paisley, Summer Lake, Silver Lake, Adel, Fort Rock, the Warner and Hart mountains, and portions of Highways 395, 31, and 140. Southwest Klamath counties, including Klamath Falls, Bonanza, and portions of Highways 97, 140, 39, and 139. For the wind advisory, the remainder of zones, including the cities of Modoc Point, Chemult, Crescent, Canby and Alturas. * WHEN...For the Wind Advisory, until 4 PM PST Friday. For the High Wind Warning, until 10 AM PST Friday. * IMPACTS...Damaging winds could blow down trees and power lines. Power outages are possible. Travel will be difficult, especially for high profile vehicles. Unsecured objects may be lost or damaged. * ADDITIONAL DETAILS...Gusty winds persist overnight, but could ease for a time into Thursday afternoon. Strong winds are likely to redevelop Thursday evening with gusts to 60 mph into Friday morning.

High Wind Warning issued November 21 at 2:12AM PST until November 22 at 10:00AM PST by NWS Medford OR

* WHAT...South winds 25 to 40 mph with gusts up to 60 mph. * WHERE...Northeast Siskiyou and Northwest Modoc Counties, this includes the cities of Macdoel, Dorris, Tulelake, and Newell. * WHEN...Until 10 AM PST Friday. * IMPACTS...Damaging winds will blow down trees and power lines. Widespread power outages are expected. Travel will be difficult, especially for high profile vehicles. * ADDITIONAL DETAILS...Gusty winds persist overnight, but could ease for a time into Thursday afternoon. Strong winds are likely to redevelop Thursday evening with gusts to 60 mph into Friday morning.

High Wind Warning issued November 21 at 2:12AM PST until November 22 at 10:00AM PST by NWS Medford OR

* WHAT...South winds 25 to 40 mph with gusts up to 60 mph. * WHERE...The Shasta Valley in central Siskiyou COunty, including Weed, Grenada, Montague, and portions of Interstate 5 and Highway 97. * WHEN...Until 10 AM PST Friday. * IMPACTS...Damaging winds could blow down trees and power lines. Power outages are possible. Travel will be difficult, especially for high profile vehicles. Unsecured objects may be lost or damaged. * ADDITIONAL DETAILS...Gusty winds persist overnight, but could ease for a time into Thursday afternoon. Strong winds are likely to redevelop Thursday evening with gusts to 60 mph into Friday morning.

Wind Advisory issued November 21 at 2:12AM PST until November 22 at 4:00PM PST by NWS Medford OR

* WHAT...For the High Wind Warning, south winds 25 to 40 mph with gusts up to 65 mph. For the Wind Advisory, south winds 20 to 30 mph with gusts up to 50 mph. * WHERE...For the high wind warning. Portions of Lake and Modoc counties and far eastern Klamath County, including Lakeview, Valley Falls, Bly, Paisley, Summer Lake, Silver Lake, Adel, Fort Rock, the Warner and Hart mountains, and portions of Highways 395, 31, and 140. Southwest Klamath counties, including Klamath Falls, Bonanza, and portions of Highways 97, 140, 39, and 139. For the wind advisory, the remainder of zones, including the cities of Modoc Point, Chemult, Crescent, Canby and Alturas. * WHEN...For the Wind Advisory, until 4 PM PST Friday. For the High Wind Warning, until 10 AM PST Friday. * IMPACTS...Damaging winds could blow down trees and power lines. Power outages are possible. Travel will be difficult, especially for high profile vehicles. Unsecured objects may be lost or damaged. * ADDITIONAL DETAILS...Gusty winds persist overnight, but could ease for a time into Thursday afternoon. Strong winds are likely to redevelop Thursday evening with gusts to 60 mph into Friday morning.

Flood Watch issued November 21 at 1:08AM PST until November 23 at 4:00AM PST by NWS Sacramento CA

* WHAT...Prolonged periods of moderate to heavy rain with amounts of 3 to 6 inches expected, and up to 8 to 12 inches possible in the foothills. Flooding caused by excessive rainfall is possible. * WHERE...A portion of northern California, including the following areas, Northern and Central Sacramento Valley, Mountains Southwestern Shasta County to Western Colusa County, Northeast Foothills/Sacramento Valley, and Shasta Lake Area / Northern Shasta County. * WHEN...Through 4 AM PST Saturday morning. * IMPACTS...Excessive runoff may result in sharp rises of rivers, creeks, and streams, and ponding of water or flooding on roadways and other low-lying locations. * ADDITIONAL DETAILS... - http://www.weather.gov/safety/flood

High Surf Advisory issued November 21 at 12:19AM PST until November 21 at 10:00AM PST by NWS Los Angeles/Oxnard CA

* WHAT...Large breaking waves of 10 to 12 feet for northwest and west facing beaches with dangerous rip currents. * WHERE...San Luis Obispo County Beaches and Santa Barbara County Central Coast Beaches. * WHEN...Until 10 AM PST this morning. * IMPACTS...There is an increased risk for ocean drowning. Rip currents can pull swimmers and surfers out to sea. Large breaking waves can cause injury, wash people off beaches and rocks, and capsize small boats near shore.

Flood Warning issued November 20 at 10:46PM PST until November 23 at 12:00AM PST by NWS Medford OR

* WHAT...Flooding caused by excessive rainfall and snowmelt is expected. * WHERE...A portion of northern California, including the following county, Siskiyou, including the cities of Mount Shasta City, Weed, Callahan and Tennant. * WHEN...Until midnight PST Friday Night. * IMPACTS...Flooding of rivers, creeks, streams, and other low-lying and flood-prone locations is imminent or occurring. * ADDITIONAL DETAILS... - At 1042 PM PST, Satellite estimates and rain gauge data indicate heavy rain and snowmelt in the warned area. Flooding is ongoing or expected to begin shortly. Between 2 and 6 inches of rain have fallen. - Additional rainfall amounts of 3 to 7 inches are possible in the warned area. Many areas that received heavy snowfall earlier have switched over to rain. Rain can melt the snow and cause a higher runoff response than rainfall alone. - Some locations that will experience flooding include... Mount Shasta, Weed, Dunsmuir, Pilgrim Creek Snow Park, Trout Creek Campground, Cattle Camp Campground, Fowlers Camp Campground And McCloud Falls, McCloud, Tennant, Mount Shasta Summit Plateau, Mount Shasta Ski Park Highway, Mount Shasta Bunny Flat Trail, Mcbride Springs Campground, Pondosa, Four Corners Snow Park, I 5 Black Butte Summit, Carrick, Edgewood, Medicine Lake Campground and Callahan. - http://www.weather.gov/safety/flood

Flood Advisory issued November 20 at 2:18PM PST until November 23 at 12:00PM PST by NWS Reno NV

* WHAT...Minor flooding is forecast for the Susan River, small creeks and streams, and on or near recent burn scars. This does not include the Middle Fork of the Feather. * WHERE...Northeast California including Lassen, eastern Plumas, and eastern Sierra counties. * WHEN...Until noon PST Saturday. Flows are expected to rise though the day Thursday into Friday with peak flows occurring late Friday to early Saturday morning. * IMPACTS...Minor flooding along low lying areas near the Susan River in and downstream of Susanville, as well as near other creeks, streams, urban areas. Rock and debris may cover roads especially near or below recent burn areas. * ADDITIONAL DETAILS... - At 210 PM PST, Rounds of high elevation snow and heavy rain are forecast today through Saturday morning before transitioning to snow. - Additional rainfall amounts of 3 to 6 inches are expected over the area. This additional rain will result in minor flooding. - Some locations that will experience flooding include... Eagle Lake, Termo, Herlong, Beckwourth, Doyle, Blairsden, Plumas Eureka State Park, Graeagle, Chilcoot, Bieber, Sierraville, Nubieber, Stampede Reservoir, Verdi, Susanville, Standish, Janesville, Aspen Grove Campground, Antelope Lake and Spaulding. - http://www.weather.gov/safety/flood For river forecast updates, visit cnrfc.noaa.gov

Flood Warning issued November 20 at 12:45PM PST until November 23 at 12:00AM PST by NWS Medford OR

* WHAT...Flooding caused by excessive rainfall and snow melt is expected. * WHERE...Portions of southwest Oregon, including Coos, Curry, Jackson, and Josephine counties and western Siskiyou County in northern California. * WHEN...Until midnight PST Friday Night. * IMPACTS...Flooding of rivers, creeks, streams, and other low-lying and flood-prone locations is expected. * ADDITIONAL DETAILS... - At 1227 PM PST, satellite estimates and rain gauge data indicate heavy rain in the warned area. Between 1 and 6 inches of rain have fallen. - Additional rainfall amounts of 3 to 7 inches are possible in the warned area. Some areas will receive snowfall and then switch to rainfall. Rain can melt the snow and cause a higher runoff response than rainfall alone. - http://www.weather.gov/safety/flood

Avalanche Warning issued November 18 at 10:44PM PST by NWS Medford OR

AVWMFR The Mount Shasta Avalanche Center has issued a BACKCOUNTRY AVALANCHE WARNING for the following areas: NWS Medford OR - CAZ082 (South Central Siskiyou County). * WHAT...An exceptionally powerful atmospheric river will impact the Mount Shasta region. Prolonged periods of heavy snowfall, along with rain-on-snow will create high avalanche danger. * WHERE...Avalanche terrain of Mount Shasta, Castle Lake, the Eddy Mountains, and Ash Creek Butte area east of Mount Shasta. * WHEN...In effect from Tue 12:00 PST to Thu 12:00 PST. * IMPACTS...Intense rainfall and multiple feet of new snow will produce large and destructive avalanches. These avalanches may run long distances into flat terrain, valley floors, and mature forests. In addition, debris flows are possible out of Mount Shasta drainages such as Cascade Gulch, Ash Creek, and Mud Creek. * PRECAUTIONARY / PREPAREDNESS ACTIONS...Very dangerous avalanche conditions. Travel in, near, or below avalanche terrain is not recommended. Recreational users without backcountry avalanche skills are advised to stay out of the backcountry. Deep snow conditions exist. Consult http://shastaavalanche.org/ or www.avalanche.org for more detailed information. Similar avalanche danger may exist at locations outside the coverage area of this or any avalanche center.