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

Winter Storm Warning until December 26, 10:00 AM PST

Current conditions at

Mammoth Yosemite Airport (KMMH)

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

Mostly Cloudy

34°F

1°C

Humidity	93%
Wind Speed	N 5 MPH
Barometer	29.81 in (1009.48 mb)
Dewpoint	32°F (0°C)
Visibility	10.00 mi
Wind Chill	29°F (-2°C)
Last update	24 Dec 05:15 PM PST

More Information:

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

Extended Forecast for

9 Miles SE Mammoth Lakes CA

Winter Storm Warning December 24, 05:34pm until December 26, 10:00am

Click here for hazard details and duration

Winter Storm Warning

Winter Storm Warning December 24, 05:34pm until December 26, 10:00am
NOW until 10:00am Fri
Winter Storm Warning
This Afternoon
High: 30 °F
Chance Snow
and Areas
Freezing Fog
Tonight
Low: 18 °F
Heavy Snow
and Dense
Freezing Fog
Christmas Day
High: 24 °F
Heavy Snow
and Dense
Freezing Fog
Thursday Night
Low: 18 °F
Heavy Snow
and Areas
Freezing Fog
Friday
High: 23 °F
Heavy Snow
and Dense
Freezing Fog
Friday Night
Low: 4 °F
Chance Snow
and Breezy
Saturday
High: 22 °F
Slight Chance
Snow
Saturday Night
Low: 1 °F
Mostly Clear
and Breezy

Detailed Forecast

This Afternoon

A 50 percent chance of snow. Areas of freezing fog. Partly sunny, with a high near 30. Very windy, with a south wind around 40 mph, with gusts as high as 60 mph. Total daytime snow accumulation of 17 to 23 inches possible.

Tonight

Snow, mainly after 7pm. The snow could be heavy at times. Widespread dense freezing fog before 9pm, then widespread dense freezing fog after 10pm. Low around 18. Very windy, with a south wind 45 to 50 mph, with gusts as high as 70 mph. Chance of precipitation is 90%. New snow accumulation of 9 to 13 inches possible.

Christmas Day

Snow before 4pm, then snow showers after 4pm. The snow could be heavy at times. Some thunder is also possible. Widespread dense freezing fog, mainly between 7am and 2pm. High near 24. Very windy, with a southwest wind 40 to 50 mph, with gusts as high as 70 mph. Chance of precipitation is 100%. New snow accumulation of 17 to 23 inches possible.

Thursday Night

Snow showers before 10pm, then snow after 10pm. The snow could be heavy at times. Some thunder is also possible. Patchy fog between 11pm and 2am. Areas of freezing fog after 5am. Low around 18. 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 14 to 20 inches possible.

Friday

Snow. The snow could be heavy at times. Areas of fog between 8am and 11am. Widespread dense freezing fog before 8am. High near 23. Very windy, with a southwest wind 40 to 50 mph decreasing to 25 to 35 mph in the afternoon. Winds could gust as high as 70 mph. Chance of precipitation is 100%. New snow accumulation of 7 to 11 inches possible.

Friday Night

A 50 percent chance of snow. Mostly cloudy, with a low around 4. Breezy, with a southwest wind 15 to 20 mph. New snow accumulation of around an inch possible.

Saturday

A 20 percent chance of snow. Mostly sunny, with a high near 22.

Saturday Night

Mostly clear, with a low around 1. Breezy.

Sunday

Sunny, with a high near 26. Breezy.

Sunday Night

Clear, with a low around 6. Blustery.

Monday

Sunny, with a high near 31. Blustery.

Monday Night

Mostly clear, with a low around 14.