National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Atmospheric River Bringing Heavy Rain to Southern California and Heavy Snow to the Sierra Nevadas

A strong atmospheric river will continue heavy rain over southern California through Friday. The heaviest rainfall is ongoing today in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall has begun over the Sierra Nevada Mountains and will continue through Friday. Travel will become increasingly difficult over the passes due to snow and strong winds. Read More >

Hazardous Weather Conditions

Current conditions at

LYONS VALLEY (COWC1)

Lat: 39.12583°NLon: 123.07333°WElev: 3355.0ft.

NA

39°F

4°C

Humidity 100%
Wind Speed W 13 MPH
Barometer NA
Dewpoint 39°F (4°C)
Visibility NA
Wind Chill31°F (-1°C)
Last update 24 Dec 08:01 AM PST
Extended Forecast for

10 Miles NNW Lakeport CA

Flood Watch December 24, 09:14am until December 26, 10:00pm
High Wind Watch December 25, 12:00am until December 25, 07:00pm
Click here for hazard details and duration
Flood Watch
High Wind Watch
  •  
    Flood Watch December 24, 09:14am until December 26, 10:00pm

    NOW until 10:00pm Fri

    Flood Watch

  • Today

    High: 55 °F

    Rain then
    Chance Rain

  • Tonight

    Tonight: Rain, with thunderstorms also possible after 10pm. Low around 39. Windy, with a southeast wind 17 to 26 mph, with gusts as high as 47 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.

    Low: 39 °F

    Rain and
    Windy

  • Christmas Day

    Christmas Day: Rain, with thunderstorms also possible after 10am. High near 49. Breezy, with a south wind 16 to 20 mph, with gusts as high as 44 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 49 °F

    Rain and
    Breezy

  • Thursday Night

    Thursday Night: Rain. Low around 38. Breezy, with a south wind 17 to 20 mph, with gusts as high as 44 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 38 °F

    Rain and
    Breezy

  • Friday

    Friday: Rain before 10am, then rain and possibly a thunderstorm between 10am and 4pm, then showers likely and possibly a thunderstorm after 4pm. High near 51. Breezy, with a south wind 13 to 16 mph, with gusts as high as 33 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

    High: 51 °F

    Showers and
    Breezy

  • Friday Night

    Friday Night: Showers likely, mainly before 10pm. Mostly cloudy, with a low around 35. East wind 9 to 13 mph becoming north northeast after midnight. Winds could gust as high as 18 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 35 °F

    Showers
    Likely

  • Saturday

    Saturday: A 20 percent chance of showers before 10am. Mostly sunny, with a high near 54.

    High: 54 °F

    Slight Chance
    Showers then
    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 32.

    Low: 32 °F

    Mostly Clear

Detailed Forecast

Today
Rain, mainly before 10am. High near 55. Southwest wind 6 to 9 mph becoming southeast in the afternoon. Winds could gust as high as 21 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Tonight
Rain, with thunderstorms also possible after 10pm. Low around 39. Windy, with a southeast wind 17 to 26 mph, with gusts as high as 47 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.
Christmas Day
Rain, with thunderstorms also possible after 10am. High near 49. Breezy, with a south wind 16 to 20 mph, with gusts as high as 44 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Thursday Night
Rain. Low around 38. Breezy, with a south wind 17 to 20 mph, with gusts as high as 44 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
Friday
Rain before 10am, then rain and possibly a thunderstorm between 10am and 4pm, then showers likely and possibly a thunderstorm after 4pm. High near 51. Breezy, with a south wind 13 to 16 mph, with gusts as high as 33 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Friday Night
Showers likely, mainly before 10pm. Mostly cloudy, with a low around 35. East wind 9 to 13 mph becoming north northeast after midnight. Winds could gust as high as 18 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday
A 20 percent chance of showers before 10am. Mostly sunny, with a high near 54.
Saturday Night
Mostly clear, with a low around 32.
Sunday
Sunny, with a high near 58.
Sunday Night
Mostly clear, with a low around 34.
Monday
Sunny, with a high near 62.
Monday Night
Mostly clear, with a low around 37.
Tuesday
Sunny, with a high near 65.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
10 Miles NNW Lakeport CA
 39.17°N 122.98°W (Elev. 1998 ft)
Last Update:
1:10 am PST Dec 24, 2025
Forecast Valid:
9am PST Dec 24, 2025-6pm PST Dec 30, 2025
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation