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.

Overcast

32°F

0°C

Humidity	86%
Wind Speed	E 10 MPH
Barometer	29.85 in (1010.84 mb)
Dewpoint	28°F (-2°C)
Visibility	10.00 mi
Wind Chill	24°F (-4°C)
Last update	25 Dec 02:55 AM PST

More Information:

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

Extended Forecast for

5 Miles ENE Mammoth Lakes CA

Winter Storm Warning December 25, 03:05am until December 26, 10:00am

Click here for hazard details and duration

Winter Storm Warning

Winter Storm Warning December 25, 03:05am until December 26, 10:00am
NOW until 10:00am Fri
Winter Storm Warning
Overnight
Low: 28 °F
Heavy Snow
and Breezy
Christmas Day
High: 36 °F
Heavy Snow
and Breezy
Thursday Night
Low: 27 °F
Heavy Snow
and Breezy
Friday
High: 36 °F
Heavy Snow
Friday Night
Low: 11 °F
Chance Snow
Saturday
High: 35 °F
Slight Chance
Snow
Saturday Night
Low: 8 °F
Mostly Clear
Sunday
High: 38 °F
Sunny

Detailed Forecast

Overnight

Snow. The snow could be heavy at times. Low around 28. Breezy, with a south wind around 20 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. Total nighttime snow accumulation of 3 to 5 inches possible.

Christmas Day

Snow. The snow could be heavy at times. High near 36. 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 5 to 9 inches possible.

Thursday Night

Snow. The snow could be heavy at times. Low around 27. Breezy, with a south wind 15 to 20 mph, with gusts as high as 40 mph. Chance of precipitation is 100%. New snow accumulation of 4 to 8 inches possible.

Friday

Snow, mainly before 4pm. The snow could be heavy at times. High near 36. Southwest wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New snow accumulation of 2 to 4 inches possible.

Friday Night

A 40 percent chance of snow, mainly before 10pm. Partly cloudy, with a low around 11. Southwest wind 5 to 10 mph. Little or no snow accumulation expected.

Saturday

A 20 percent chance of snow. Mostly sunny, with a high near 35. Calm wind becoming northwest around 5 mph in the afternoon.

Saturday Night

Mostly clear, with a low around 8.

Sunday

Sunny, with a high near 38.

Sunday Night

Mostly clear, with a low around 14.

Monday

Sunny, with a high near 43.

Monday Night

Mostly clear, with a low around 20.