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	92%
Wind Speed	ESE 20 MPH
Barometer	29.9 in (1012.53 mb)
Dewpoint	30°F (-1°C)
Visibility	0.50 mi
Wind Chill	20°F (-7°C)
Last update	25 Dec 03:35 PM PST

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

8 Miles SE Mammoth Lakes CA

Winter Storm Warning December 25, 03:57pm until December 26, 10:00am

Click here for hazard details and duration

Winter Storm Warning

Winter Storm Warning December 25, 03:57pm until December 26, 10:00am
NOW until 10:00am Fri
Winter Storm Warning
Christmas Day
High: 24 °F
Heavy Snow
and Very
Windy
Tonight
Low: 17 °F
Heavy Snow
and Dense
Freezing Fog
Friday
High: 24 °F
Heavy Snow
and Dense
Freezing Fog
Friday Night
Low: 4 °F
Breezy.
Chance Snow
then Slight
Chance Snow
Saturday
High: 22 °F
Sunny
Saturday Night
Low: 4 °F
Mostly Clear
and Breezy
Sunday
High: 26 °F
Sunny
Sunday Night
Low: 8 °F
Mostly Clear
and Blustery

Detailed Forecast

Christmas Day

Snow before 4pm, then snow showers after 4pm. The snow could be heavy at times. Some thunder is also possible. High near 24. Very windy, with a southwest wind around 40 mph, with gusts as high as 60 mph. Chance of precipitation is 90%. Total daytime snow accumulation of 13 to 19 inches possible.

Tonight

Snow before 1am, then snow showers between 1am and 4am, then snow after 4am. The snow could be heavy at times. Some thunder is also possible. Patchy fog after 4am. Widespread dense freezing fog, mainly before 1am. Low around 17. Very windy, with a southwest wind around 55 mph, with gusts as high as 85 mph. Chance of precipitation is 100%. New snow accumulation of 10 to 14 inches possible.

Friday

Snow, mainly before 4pm. The snow could be heavy at times. Widespread dense freezing fog, mainly before 10am. High near 24. Very windy, with a southwest wind 40 to 50 mph decreasing to 25 to 35 mph. Winds could gust as high as 70 mph. Chance of precipitation is 80%. New snow accumulation of 6 to 10 inches possible.

Friday Night

A 50 percent chance of snow, mainly before 10pm. Mostly cloudy, with a low around 4. Breezy, with a southwest wind around 20 mph, with gusts as high as 35 mph. New snow accumulation of less than a half inch possible.

Saturday

Sunny, with a high near 22. Northwest wind 5 to 15 mph.

Saturday Night

Mostly clear, with a low around 4. Breezy, with a west wind 15 to 20 mph, with gusts as high as 30 mph.

Sunday

Sunny, with a high near 26.

Sunday Night

Mostly clear, with a low around 8. Blustery.

Monday

Sunny, with a high near 30. Blustery.

Monday Night

Mostly clear, with a low around 14. Breezy.