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 in effect from December 23, 10:00 PM PST until December 26, 10:00 AM PST

Current conditions at

Mammoth Yosemite Airport (KMMH)

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

snow,freezing fog

32°F

0°C

Humidity	100%
Wind Speed	SE 8 MPH
Barometer	29.85 in (1010.84 mb)
Dewpoint	32°F (0°C)
Visibility	0.25 mi
Wind Chill	25°F (-4°C)
Last update	24 Dec 10:15 AM PST

More Information:

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

Extended Forecast for

8 Miles ENE 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
Today
High: 43 °F
Rain/Snow
Tonight
Low: 26 °F
Snow
Christmas Day
High: 39 °F
Snow and
Breezy
Thursday Night
Low: 25 °F
Heavy Snow
and Breezy
Friday
High: 38 °F
Snow
Friday Night
Low: 8 °F
Chance Snow
Saturday
High: 36 °F
Chance Snow
Saturday Night
Low: 8 °F
Slight Chance
Snow then
Mostly Clear

Detailed Forecast

Today

Rain and snow. Snow level 7400 feet. High near 43. South wind around 15 mph. Chance of precipitation is 100%. Total daytime snow accumulation of less than a half inch possible.

Tonight

Snow. Low around 26. Southeast wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New snow accumulation of 1 to 3 inches possible.

Christmas Day

Snow. High near 39. Breezy, with a south wind 15 to 20 mph, with gusts as high as 35 mph. Chance of precipitation is 100%. New snow accumulation of 3 to 7 inches possible.

Thursday Night

Snow. The snow could be heavy at times. Low around 25. Breezy, with a south wind around 20 mph, with gusts as high as 35 mph. Chance of precipitation is 100%. New snow accumulation of 3 to 7 inches possible.

Friday

Snow. High near 38. Southwest wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New snow accumulation of 1 to 3 inches possible.

Friday Night

A 50 percent chance of snow. Mostly cloudy, with a low around 8. Southwest wind 5 to 10 mph. Little or no snow accumulation expected.

Saturday

A 30 percent chance of snow, mainly before 4pm. Mostly sunny, with a high near 36. Little or no snow accumulation expected.

Saturday Night

A slight chance of snow before 10pm. Mostly clear, with a low around 8.

Sunday

Sunny, with a high near 39.

Sunday Night

Mostly clear, with a low around 13.

Monday

Sunny, with a high near 44.