National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Heavy Great Lakes Snow through Friday; Extreme Cold and Potential for Major Winter Storm Late Week into this Weekend

Multiple clipper systems will bring cold temperatures and enhance lake-effect snow downwind of the Great Lakes. An arctic blast will bring frigid temperatures accompanied with gusty winds that may lead to dangerous wind chills beginning in the Northern Plains Thursday before expanding to the South and East. An expansive winter storm will start Friday in the Southern Rockies/Plains and Mid-South. Read More >

Hazardous Weather Conditions

Current conditions at

MAMMOTH AT YELLOWSTONE NATIONAL PARK (YLAW4)

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

NA

10°F

-12°C

Humidity 72%
Wind Speed S 5 MPH
Barometer NA
Dewpoint 3°F (-16°C)
Visibility NA
Wind Chill1°F (-17°C)
Last update 21 Jan 08:15 AM MST
Extended Forecast for

5 Miles SSW Mammoth Hot Springs WY

  • Today

    Today: Sunny, with a high near 21. Wind chill values as low as zero. South wind 5 to 8 mph.

    High: 21 °F

    Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 4. Wind chill values as low as -5. South southwest wind 3 to 6 mph.

    Low: 4 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 20. Wind chill values as low as -5. Light and variable wind becoming north northwest around 6 mph in the afternoon.

    High: 20 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 0. North northeast wind 3 to 5 mph.

    Low: 0 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 14. North northwest wind 5 to 8 mph.

    High: 14 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around -7. North northwest wind 5 to 7 mph becoming light and variable.

    Low: -7 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 16. South southwest wind 6 to 8 mph becoming west in the afternoon.

    High: 16 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around -2.

    Low: -2 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 18.

    High: 18 °F

    Mostly Sunny

Detailed Forecast

Today
Sunny, with a high near 21. Wind chill values as low as zero. South wind 5 to 8 mph.
Tonight
Mostly cloudy, with a low around 4. Wind chill values as low as -5. South southwest wind 3 to 6 mph.
Thursday
Mostly sunny, with a high near 20. Wind chill values as low as -5. Light and variable wind becoming north northwest around 6 mph in the afternoon.
Thursday Night
Partly cloudy, with a low around 0. North northeast wind 3 to 5 mph.
Friday
Mostly sunny, with a high near 14. North northwest wind 5 to 8 mph.
Friday Night
Mostly clear, with a low around -7. North northwest wind 5 to 7 mph becoming light and variable.
Saturday
Mostly sunny, with a high near 16. South southwest wind 6 to 8 mph becoming west in the afternoon.
Saturday Night
Partly cloudy, with a low around -2.
Sunday
Mostly sunny, with a high near 18.
Sunday Night
Mostly clear, with a low around 1.
Monday
Mostly sunny, with a high near 23.
Monday Night
Partly cloudy, with a low around 8.
Tuesday
Partly sunny, with a high near 27.
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles SSW Mammoth Hot Springs WY
 44.89°N 110.74°W (Elev. 7402 ft)
Last Update:
8:47 am MST Jan 21, 2026
Forecast Valid:
8am MST Jan 21, 2026-6pm MST Jan 27, 2026
 
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