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 AT YELLOWSTONE NATIONAL PARK (YLAW4)

Lat: 44.977222°NLon: 110.695278°WElev: 6138.0ft.

37°F

3°C

Humidity	82%
Wind Speed	S 8 MPH
Barometer	NA
Dewpoint	32°F (0°C)
Visibility	NA
Wind Chill	31°F (-1°C)
Last update	26 Dec 02:15 AM MST

More Information:

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

Extended Forecast for

5 Miles SSW Mammoth Hot Springs WY

Winter Weather Advisory December 26, 05:00am until December 26, 11:00pm

Click here for hazard details and duration

Winter Weather Advisory

Overnight
Low: 29 °F
Snow Likely
and Patchy
Blowing Snow
Friday
High: 34 °F
Snow and
Patchy
Blowing Snow
Friday Night
Low: 20 °F
Chance Snow
and Patchy
Blowing Snow
Saturday
High: 24 °F
Snow and
Breezy
Saturday Night
Low: -3 °F
Slight Chance
Snow then
Mostly Clear
Sunday
High: 16 °F
Sunny
Sunday Night
Low: 0 °F
Mostly Clear
Monday
High: 21 °F
Sunny
Monday Night
Low: 8 °F
Partly Cloudy

Detailed Forecast

Overnight

Snow likely. Patchy blowing snow. Mostly cloudy, with a low around 29. Breezy, with a south southwest wind 8 to 18 mph, with gusts as high as 25 mph. Chance of precipitation is 70%. Total nighttime snow accumulation of 1 to 3 inches possible.

Friday

Snow, mainly before 2pm. Some thunder is also possible. Patchy blowing snow. High near 34. Breezy, with a south southwest wind 18 to 24 mph, with gusts as high as 33 mph. Chance of precipitation is 90%. New snow accumulation of 2 to 4 inches possible.

Friday Night

A 50 percent chance of snow. Some thunder is also possible. Patchy blowing snow before 11pm. Mostly cloudy, with a low around 20. Breezy, with a south southwest wind 20 to 22 mph, with gusts as high as 31 mph. New snow accumulation of around an inch possible.

Saturday

Snow. Some thunder is also possible. High near 24. Breezy, with a southwest wind 16 to 21 mph decreasing to 9 to 14 mph in the afternoon. Winds could gust as high as 38 mph. Chance of precipitation is 100%. New snow accumulation of 1 to 3 inches possible.

Saturday Night

A 20 percent chance of snow before 11pm. Partly cloudy, with a low around -3. Northwest wind 5 to 7 mph.

Sunday

Sunny, with a high near 16. Southwest wind around 6 mph.

Sunday Night

Mostly clear, with a low around 0. South wind around 6 mph.

Monday

Sunny, with a high near 21.

Monday Night

Partly cloudy, with a low around 8.

Tuesday

Partly sunny, with a high near 27.