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

Excessive Rainfall and Tropical Storm in the South; Severe Thunderstorms in the Midwest

Excessive rainfall may produce considerable, potentially life-threatening, flooding across the lower Mississippi River Valley and central Great Lakes region through tonight. Tropical Storm Arthur will move northeastward along the Texas coast today and then move inland over southwestern Louisiana by tonight. An outbreak of severe thunderstorms is expected across portions of Illinois and Indiana. Read More >

Current conditions at

MAMMOTH AT YELLOWSTONE NATIONAL PARK (YLAW4)

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

NA

65°F

18°C

Humidity 25%
Wind Speed NNW 12 MPH
Barometer NA
Dewpoint 29°F (-2°C)
Visibility NA
Last update 17 Jun 05:15 PM MDT
Extended Forecast for

2 Miles S Mount Holmes WY

  • Tonight

    Tonight: Mostly clear, with a low around 35. Breezy, with a north wind 13 to 18 mph decreasing to 5 to 10 mph after midnight. Winds could gust as high as 28 mph.

    Low: 35 °F

    Mostly Clear
    and Breezy
    then Mostly
    Clear

  • Thursday

    Thursday: Sunny, with a high near 63. Breezy, with a light west northwest wind becoming west 10 to 15 mph in the morning. Winds could gust as high as 29 mph.

    High: 63 °F

    Sunny then
    Sunny and
    Breezy

  • Thursday Night

    Thursday Night: Increasing clouds, with a low around 39. Breezy, with a west wind 5 to 15 mph becoming northeast after midnight. Winds could gust as high as 29 mph.

    Low: 39 °F

    Mostly Clear
    and Breezy
    then Mostly
    Cloudy

  • Juneteenth

    Juneteenth: Mostly sunny, with a high near 69. Northeast wind 5 to 14 mph becoming south southwest in the morning. Winds could gust as high as 25 mph.

    High: 69 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 46. West wind 5 to 13 mph becoming east after midnight. Winds could gust as high as 24 mph.

    Low: 46 °F

    Mostly Cloudy

  • Saturday

    Saturday: A chance of showers before 9am, then a chance of showers and thunderstorms between 9am and noon, then showers and possibly a thunderstorm after noon. High near 60. South southeast wind 5 to 11 mph becoming west in the afternoon. Winds could gust as high as 22 mph. Chance of precipitation is 90%.

    High: 60 °F

    Chance
    Showers then
    Showers

  • Saturday Night

    Saturday Night: Showers likely and possibly a thunderstorm before midnight, then a slight chance of showers. Mostly cloudy, with a low around 40. West southwest wind 5 to 7 mph becoming calm after midnight. Chance of precipitation is 70%.

    Low: 40 °F

    Showers
    Likely then
    Slight Chance
    Showers

  • Sunday

    Sunday: A 40 percent chance of showers and thunderstorms, mainly after noon. Mostly sunny, with a high near 59.

    High: 59 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A 20 percent chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 38.

    Low: 38 °F

    Slight Chance
    T-storms then
    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 35. Breezy, with a north wind 13 to 18 mph decreasing to 5 to 10 mph after midnight. Winds could gust as high as 28 mph.
Thursday
Sunny, with a high near 63. Breezy, with a light west northwest wind becoming west 10 to 15 mph in the morning. Winds could gust as high as 29 mph.
Thursday Night
Increasing clouds, with a low around 39. Breezy, with a west wind 5 to 15 mph becoming northeast after midnight. Winds could gust as high as 29 mph.
Juneteenth
Mostly sunny, with a high near 69. Northeast wind 5 to 14 mph becoming south southwest in the morning. Winds could gust as high as 25 mph.
Friday Night
Mostly cloudy, with a low around 46. West wind 5 to 13 mph becoming east after midnight. Winds could gust as high as 24 mph.
Saturday
A chance of showers before 9am, then a chance of showers and thunderstorms between 9am and noon, then showers and possibly a thunderstorm after noon. High near 60. South southeast wind 5 to 11 mph becoming west in the afternoon. Winds could gust as high as 22 mph. Chance of precipitation is 90%.
Saturday Night
Showers likely and possibly a thunderstorm before midnight, then a slight chance of showers. Mostly cloudy, with a low around 40. West southwest wind 5 to 7 mph becoming calm after midnight. Chance of precipitation is 70%.
Sunday
A 40 percent chance of showers and thunderstorms, mainly after noon. Mostly sunny, with a high near 59.
Sunday Night
A 20 percent chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 38.
Monday
A 10 percent chance of showers and thunderstorms after noon. Sunny, with a high near 62.
Monday Night
Mostly clear, with a low around 37.
Tuesday
Sunny, with a high near 67.
Tuesday Night
Mostly clear, with a low around 42.
Wednesday
A slight chance of showers and thunderstorms. Sunny, with a high near 68.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles S Mount Holmes WY
 44.8°N 110.84°W (Elev. 8209 ft)
Last Update:
4:02 pm MDT Jun 17, 2026
Forecast Valid:
5pm MDT Jun 17, 2026-6pm MDT Jun 24, 2026
 
Forecast Discussion
 
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Additional Resources

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National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation