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.

unknown precip

36°F

2°C

Humidity	80%
Wind Speed	SE 12 MPH
Barometer	29.79 in (1008.81 mb)
Dewpoint	30°F (-1°C)
Visibility	10.00 mi
Wind Chill	28°F (-2°C)
Last update	24 Dec 06:55 PM PST

More Information:

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

Extended Forecast for

4 Miles ENE Mammoth Lakes CA

Winter Storm Warning December 24, 07:00pm until December 26, 10:00am

Click here for hazard details and duration

Winter Storm Warning

Winter Storm Warning December 24, 07:00pm until December 26, 10:00am
NOW until 10:00am Fri
Winter Storm Warning
Tonight
Low: 28 °F
Heavy Snow
and Breezy
Christmas Day
High: 36 °F
Heavy Snow
and Dense
Freezing Fog
Thursday Night
Low: 28 °F
Heavy Snow
and Breezy
Friday
High: 36 °F
Heavy Snow
Friday Night
Low: 12 °F
Chance Snow
Saturday
High: 34 °F
Slight Chance
Snow
Saturday Night
Low: 9 °F
Mostly Clear
Sunday
High: 38 °F
Sunny

Detailed Forecast

Tonight

Snow. The snow could be heavy at times. Low around 28. Breezy, with a south wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. Total nighttime snow accumulation of 2 to 4 inches possible.

Christmas Day

Snow, mainly before 4pm, then snow showers after 4pm. The snow could be heavy at times. Some thunder is also possible. Widespread dense freezing fog between 9am and 10am. 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 7 to 11 inches possible.

Thursday Night

Snow showers before 10pm, then snow after 10pm. The snow could be heavy at times. Some thunder is also possible. Low around 28. Breezy, with a south wind around 20 mph, with gusts as high as 35 mph. Chance of precipitation is 100%. New snow accumulation of 6 to 10 inches possible.

Friday

Snow. 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 3 to 5 inches possible.

Friday Night

A 50 percent chance of snow. Mostly cloudy, with a low around 12. Southwest wind 5 to 10 mph. New snow accumulation of less than a half inch possible.

Saturday

A 20 percent chance of snow. Mostly sunny, with a high near 34. Calm wind becoming north around 5 mph in the afternoon.

Saturday Night

Mostly clear, with a low around 9.

Sunday

Sunny, with a high near 38.

Sunday Night

Mostly clear, with a low around 12.

Monday

Sunny, with a high near 43.

Monday Night

Mostly clear, with a low around 20.