Heavy Rainfall to Bring Flooding Threat to California; Heavy Snow in the Sierra

A strong atmospheric river will bring heavy rainfall to California through the holiday week. The heaviest rainfall is expected on Wednesday in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall is expected in the Sierra Nevada from the atmospheric river, raising concerns for major snow‐load impacts. Travel may be difficult to impossible over the passes. 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

Top Stn/Summit (MTH03)

Lat: 37.63059°NLon: 119.03282°WElev: 11034.0ft.

24°F

-4°C

Humidity	99%
Wind Speed	S 33 MPH
Barometer	NA
Dewpoint	24°F (-4°C)
Visibility	NA
Wind Chill	6°F (-14°C)
Last update	24 Dec 01:05 AM PST

More Information:

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

Extended Forecast for

2 Miles W 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
Overnight
Low: 25 °F
Heavy Snow
and Very
Windy
Wednesday
High: 31 °F
Heavy Snow
and Very
Windy
Wednesday Night
Low: 22 °F
Heavy Snow
and Very
Windy
Christmas Day
High: 26 °F
Heavy Snow
and Very
Windy
Thursday Night
Low: 19 °F
Heavy Snow
and Damaging
Winds
Friday
High: 23 °F
Heavy Snow
and Very
Windy
Friday Night
Low: 10 °F
Snow Likely
and Breezy
Saturday
High: 20 °F
Chance Snow

Detailed Forecast

Overnight

Snow. The snow could be heavy at times. Low around 25. Very windy, with a southwest wind around 45 mph, with gusts as high as 65 mph. Chance of precipitation is 100%. Total nighttime snow accumulation of 8 to 12 inches possible.

Wednesday

Snow. The snow could be heavy at times. High near 31. Very windy, with a southwest wind 40 to 45 mph decreasing to 35 to 40 mph in the afternoon. Winds could gust as high as 65 mph. Chance of precipitation is 100%. New snow accumulation of 17 to 23 inches possible.

Wednesday Night

Snow. The snow could be heavy at times. Low around 22. Very windy, with a southwest wind 40 to 45 mph, with gusts as high as 70 mph. Chance of precipitation is 90%. New snow accumulation of 11 to 17 inches possible.

Christmas Day

Snow. The snow could be heavy at times. High near 26. Very windy, with a south wind 40 to 50 mph, with gusts as high as 70 mph. Chance of precipitation is 100%. New snow accumulation of 17 to 23 inches possible.

Thursday Night

Snow before 10pm, then snow showers after 10pm. The snow could be heavy at times. Some thunder is also possible. Low around 19. Strong and damaging winds, with a south wind 55 to 60 mph, with gusts as high as 90 mph. Chance of precipitation is 100%. New snow accumulation of 15 to 21 inches possible.

Friday

Snow. The snow could be heavy at times. High near 23. Very windy, with a southwest wind 40 to 45 mph decreasing to 30 to 35 mph in the afternoon. Winds could gust as high as 65 mph. Chance of precipitation is 100%. New snow accumulation of 8 to 12 inches possible.

Friday Night

Snow likely, mainly before 10pm. Mostly cloudy, with a low around 10. Breezy. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

Saturday

A chance of snow, mainly before 4pm. Mostly sunny, with a high near 20.

Saturday Night

A slight chance of snow before 10pm. Mostly clear, with a low around 12. Blustery.

Sunday

Sunny, with a high near 24. Blustery.

Sunday Night

Mostly clear, with a low around 15. Blustery.

Monday

Sunny, with a high near 29.

Monday Night

Mostly clear, with a low around 21.