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.

heavy snow,freezing fog

32°F

0°C

Humidity	100%
Wind Speed	ESE 14 MPH
Barometer	29.92 in (1013.21 mb)
Dewpoint	32°F (0°C)
Visibility	-0.25 mi
Wind Chill	22°F (-6°C)
Last update	25 Dec 10:15 AM PST

More Information:

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

Extended Forecast for

12 Miles ENE Mammoth Lakes CA

Winter Storm Warning December 25, 10:43am until December 26, 10:00am

Click here for hazard details and duration

Winter Storm Warning

Winter Storm Warning December 25, 10:43am until December 26, 10:00am
NOW until 10:00am Fri
Winter Storm Warning
Christmas Day
High: 39 °F
Heavy Snow
and Patchy
Freezing Fog
Tonight
Low: 22 °F
Snow and
Patchy Dense
Freezing Fog
Friday
High: 39 °F
Snow and
Patchy
Freezing Fog
Friday Night
Low: 6 °F
Chance Snow
Saturday
High: 37 °F
Slight Chance
Snow
Saturday Night
Low: 3 °F
Mostly Clear
Sunday
High: 40 °F
Becoming
Sunny
Sunday Night
Low: 8 °F
Mostly Clear

Detailed Forecast

Christmas Day

Snow. The snow could be heavy at times. Patchy freezing fog before 11am. High near 39. Breezy, with a south wind around 20 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. Total daytime snow accumulation of 3 to 5 inches possible.

Tonight

Snow. Patchy fog after 4am. Patchy dense freezing fog between 10pm and 4am. Low around 22. Breezy, with a south wind 15 to 20 mph, with gusts as high as 35 mph. Chance of precipitation is 90%. New snow accumulation of 2 to 4 inches possible.

Friday

Snow, mainly before 4pm. Patchy freezing fog before 10am. High near 39. Southwest wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New snow accumulation of 1 to 3 inches possible.

Friday Night

A 40 percent chance of snow, mainly before 10pm. Partly cloudy, with a low around 6. West wind 5 to 10 mph. Little or no snow accumulation expected.

Saturday

A 20 percent chance of snow. Mostly sunny, with a high near 37. Calm wind becoming north around 5 mph.

Saturday Night

Mostly clear, with a low around 3. West wind around 5 mph.

Sunday

Partly sunny, then gradually becoming sunny, with a high near 40.

Sunday Night

Mostly clear, with a low around 8.

Monday

Sunny, with a high near 45.