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 >

Current conditions at

Karst US-191 MP 55.3 (MTKAR)

Lat: 45.34534°NLon: 111.17261°WElev: 5699.0ft.

unknown precip

39°F

4°C

Humidity	NA
Wind Speed	NNE 1 MPH
Barometer	NA
Dewpoint	N/A
Visibility	NA
Last update	NA

More Information:

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

Extended Forecast for

4 Miles E Big Sky MT

Overnight
Low: 41 °F
Rain Likely
Christmas Day
High: 47 °F
Rain/Snow
Likely then
Slight Chance
Rain
Thursday Night
Low: 33 °F
Rain/Snow
Likely
Friday
High: 43 °F
Snow
Friday Night
Low: 20 °F
Chance Snow
Saturday
High: 32 °F
Snow
Saturday Night
Low: 4 °F
Slight Chance
Snow then
Partly Cloudy
Sunday
High: 27 °F
Mostly Sunny
Sunday Night
Low: 10 °F
Partly Cloudy

Detailed Forecast

Overnight

Rain likely. Cloudy, with a steady temperature around 41. South wind around 7 mph, with gusts as high as 20 mph. Chance of precipitation is 70%.

Christmas Day

Rain and snow likely before 11am, then a chance of rain between 11am and 1pm. Partly sunny, with a high near 47. South southeast wind 6 to 8 mph, with gusts as high as 22 mph. Chance of precipitation is 60%. Little or no snow accumulation expected.

Thursday Night

Rain and snow likely, becoming all snow after 2am. Mostly cloudy, with a low around 33. South southwest wind around 7 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

Friday

Snow. High near 43. South southwest wind 6 to 13 mph, with gusts as high as 28 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.

Friday Night

A 50 percent chance of snow. Mostly cloudy, with a low around 20. South southwest wind 6 to 10 mph, with gusts as high as 24 mph. New snow accumulation of less than one inch possible.

Saturday

Snow. High near 32. Southwest wind around 6 mph. Chance of precipitation is 90%. New snow accumulation of 1 to 2 inches possible.

Saturday Night

A 20 percent chance of snow before 11pm. Partly cloudy, with a low around 4. West northwest wind around 5 mph becoming calm in the evening.

Sunday

Mostly sunny, with a high near 27. Calm wind.

Sunday Night

Partly cloudy, with a low around 10.

Monday

Sunny, with a high near 38.

Monday Night

Mostly cloudy, with a low around 18.