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

Mammoth Yosemite Airport (KMMH)

Lat: 37.6241°NLon: 118.8423°WElev: 7112.0ft.

light snow,mist

32°F

0°C

Humidity 100%
Wind Speed N 0 MPH
Barometer 29.85 in (1010.84 mb)
Dewpoint 32°F (0°C)
Visibility 0.50 mi
Last update 24 Dec 02:15 PM PST
Extended Forecast for

8 Miles ESE Mammoth Lakes CA

Winter Storm Warning until December 26, 10:00am
Click here for hazard details and duration
Winter Storm Warning
  •  
    Winter Storm Warning until December 26, 10:00am

    NOW until 10:00am Fri

    Winter Storm Warning

  • This Afternoon

    High: 43 °F

    Rain/Snow and
    Breezy

  • Tonight

    Tonight: Snow. The snow could be heavy at times. Widespread dense freezing fog, mainly between 1am and 4am. Low around 23. South wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New snow accumulation of 2 to 4 inches possible.

    Low: 23 °F

    Heavy Snow
    and Dense
    Freezing Fog

  • Christmas Day

    Christmas Day: Snow, mainly before 4pm, then snow showers after 4pm. The snow could be heavy at times. Some thunder is also possible. Areas of fog before 7am. Widespread dense freezing fog between 7am and 10am. High near 39. Breezy, with a south wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New snow accumulation of 6 to 10 inches possible.

    High: 39 °F

    Heavy Snow
    and Dense
    Freezing Fog

  • Thursday Night

    Thursday Night: Snow showers before 10pm, then snow after 10pm. The snow could be heavy at times. Some thunder is also possible. Areas of fog between 3am and 5am. Areas of freezing fog before 3am, then areas of freezing fog after 5am. Low around 24. Breezy, with a south wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New snow accumulation of 5 to 9 inches possible.

    Low: 24 °F

    Heavy Snow
    and Areas
    Freezing Fog

  • Friday

    Friday: Snow. The snow could be heavy at times. Areas of fog between 8am and 9am. Widespread dense freezing fog before 8am. High near 39. Southwest wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New snow accumulation of 3 to 5 inches possible.

    High: 39 °F

    Heavy Snow
    and Dense
    Freezing Fog

  • Friday Night

    Friday Night: A 50 percent chance of snow. Mostly cloudy, with a low around 9. Southwest wind around 5 mph. New snow accumulation of less than a half inch possible.

    Low: 9 °F

    Chance Snow

  • Saturday

    Saturday: A 20 percent chance of snow. Mostly sunny, with a high near 37.

    High: 37 °F

    Slight Chance
    Snow

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 5.

    Low: 5 °F

    Mostly Clear

Detailed Forecast

This Afternoon
Rain, possibly mixed with snow. Snow level 7300 feet. High near 43. Breezy, with a south wind around 20 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. Total daytime snow accumulation of less than one inch possible.
Tonight
Snow. The snow could be heavy at times. Widespread dense freezing fog, mainly between 1am and 4am. Low around 23. South wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New snow accumulation of 2 to 4 inches possible.
Christmas Day
Snow, mainly before 4pm, then snow showers after 4pm. The snow could be heavy at times. Some thunder is also possible. Areas of fog before 7am. Widespread dense freezing fog between 7am and 10am. High near 39. Breezy, with a south wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New snow accumulation of 6 to 10 inches possible.
Thursday Night
Snow showers before 10pm, then snow after 10pm. The snow could be heavy at times. Some thunder is also possible. Areas of fog between 3am and 5am. Areas of freezing fog before 3am, then areas of freezing fog after 5am. Low around 24. Breezy, with a south wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New snow accumulation of 5 to 9 inches possible.
Friday
Snow. The snow could be heavy at times. Areas of fog between 8am and 9am. Widespread dense freezing fog before 8am. High near 39. Southwest wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New snow accumulation of 3 to 5 inches possible.
Friday Night
A 50 percent chance of snow. Mostly cloudy, with a low around 9. Southwest wind around 5 mph. New snow accumulation of less than a half inch possible.
Saturday
A 20 percent chance of snow. Mostly sunny, with a high near 37.
Saturday Night
Mostly clear, with a low around 5.
Sunday
Sunny, with a high near 41.
Sunday Night
Mostly clear, with a low around 10.
Monday
Sunny, with a high near 45.
Monday Night
Mostly clear, with a low around 17.
Tuesday
Sunny, with a high near 50.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
8 Miles ESE Mammoth Lakes CA
 37.61°N 118.82°W (Elev. 7201 ft)
Last Update:
1:15 pm PST Dec 24, 2025
Forecast Valid:
2pm PST Dec 24, 2025-6pm PST Dec 30, 2025
 
Forecast Discussion
 
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