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.

unknown precip

32°F

0°C

Humidity	92%
Wind Speed	ESE 4 MPH
Barometer	29.92 in (1013.21 mb)
Dewpoint	30°F (-1°C)
Visibility	7.00 mi
Wind Chill	28°F (-2°C)
Last update	25 Dec 05:55 PM PST

More Information:

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

Extended Forecast for

10 Miles SE Mammoth Lakes CA

Winter Storm Warning December 25, 06:06pm until December 26, 10:00am

Click here for hazard details and duration

Winter Storm Warning

Winter Storm Warning December 25, 06:06pm until December 26, 10:00am
NOW until 10:00am Fri
Winter Storm Warning
Tonight
Low: 23 °F
Heavy Snow
and Very
Windy
Friday
High: 27 °F
Heavy Snow
and Areas
Freezing Fog
Friday Night
Low: 10 °F
Chance Snow
then Slight
Chance Snow
Saturday
High: 25 °F
Sunny
Saturday Night
Low: 10 °F
Mostly Clear
Sunday
High: 28 °F
Sunny
Sunday Night
Low: 15 °F
Mostly Clear
Monday
High: 32 °F
Sunny

Detailed Forecast

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. Low around 23. Very windy, with a south wind 35 to 40 mph, with gusts as high as 60 mph. Chance of precipitation is 100%. Total nighttime snow accumulation of 11 to 15 inches possible.

Friday

Snow, mainly before 4pm. The snow could be heavy at times. Areas of freezing fog between 11am and 1pm. High near 27. Windy, with a southwest wind 30 to 35 mph decreasing to 20 to 25 mph in the afternoon. Winds could gust as high as 55 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. Partly cloudy, with a low around 10. Southwest wind around 15 mph, with gusts as high as 30 mph. Little or no snow accumulation expected.

Saturday

Sunny, with a high near 25. Southwest wind 5 to 10 mph becoming northwest in the afternoon.

Saturday Night

Mostly clear, with a low around 10. West wind 10 to 15 mph, with gusts as high as 25 mph.

Sunday

Sunny, with a high near 28. West wind 10 to 15 mph.

Sunday Night

Mostly clear, with a low around 15.

Monday

Sunny, with a high near 32.

Monday Night

Mostly clear, with a low around 21.