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

Heavy Rain and Flash Flooding Threat in Montana; Severe Thunderstorms in the Middle Missouri Valley

A low pressure system will bring heavy to excessive rainfall and high winds across Montana this afternoon. Heavy rainfall totals may lead to scattered flash flooding concerns. A line of showers and strong to severe thunderstorms will move into the mid Missouri Valley region this afternoon producing severe winds and isolated large hail with stronger storms. Read More >

Hazardous Weather Conditions

Current conditions at

Granby-Grand County Airport (KGNB)

Lat: 40.09°NLon: 105.92°WElev: 8207ft.

Fair

36°F

2°C

Humidity 7%
Wind Speed Calm
Barometer 30.15 in
Dewpoint -23°F (-31°C)
Visibility 10.00 mi
Last update 18 Sep 7:55 am MDT
Extended Forecast for

6 Miles WNW Arapahoe Peak CO

  • Today

    Today: Sunny, with a high near 55. Breezy, with a west wind 10 to 17 mph, with gusts as high as 28 mph.

    High: 55 °F

    Sunny then
    Sunny and
    Breezy

  • Tonight

    Tonight: Clear, with a low around 38. Breezy, with a west wind 7 to 15 mph, with gusts as high as 24 mph.

    Low: 38 °F

    Clear and
    Breezy then
    Clear

  • Thursday

    Thursday: Sunny, with a high near 60. West wind 5 to 8 mph.

    High: 60 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 40. North northwest wind around 6 mph becoming light and variable after midnight.

    Low: 40 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 62. Calm wind becoming west 5 to 9 mph in the morning. Winds could gust as high as 15 mph.

    High: 62 °F

    Sunny

  • Friday Night

    Friday Night: A slight chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and midnight. Partly cloudy, with a low around 40. Chance of precipitation is 20%.

    Low: 40 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Saturday

    Saturday: A chance of showers, then showers likely and possibly a thunderstorm after noon. Partly sunny, with a high near 48. Chance of precipitation is 70%.

    High: 48 °F

    Chance
    Showers then
    Showers
    Likely

  • Saturday Night

    Saturday Night: Rain showers likely before 2am, then rain and snow showers likely. Some thunder is also possible. Mostly cloudy, with a low around 35.

    Low: 35 °F

    Showers
    Likely then
    Rain/Snow
    Likely

  • Sunday

    Sunday: A chance of rain and snow showers before 11am, then a chance of rain showers. Some thunder is also possible. Partly sunny, with a high near 46.

    High: 46 °F

    Chance
    Rain/Snow
    then Chance
    Showers

Detailed Forecast

Today
Sunny, with a high near 55. Breezy, with a west wind 10 to 17 mph, with gusts as high as 28 mph.
Tonight
Clear, with a low around 38. Breezy, with a west wind 7 to 15 mph, with gusts as high as 24 mph.
Thursday
Sunny, with a high near 60. West wind 5 to 8 mph.
Thursday Night
Mostly clear, with a low around 40. North northwest wind around 6 mph becoming light and variable after midnight.
Friday
Sunny, with a high near 62. Calm wind becoming west 5 to 9 mph in the morning. Winds could gust as high as 15 mph.
Friday Night
A slight chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and midnight. Partly cloudy, with a low around 40. Chance of precipitation is 20%.
Saturday
A chance of showers, then showers likely and possibly a thunderstorm after noon. Partly sunny, with a high near 48. Chance of precipitation is 70%.
Saturday Night
Rain showers likely before 2am, then rain and snow showers likely. Some thunder is also possible. Mostly cloudy, with a low around 35.
Sunday
A chance of rain and snow showers before 11am, then a chance of rain showers. Some thunder is also possible. Partly sunny, with a high near 46.
Sunday Night
A slight chance of showers before midnight. Partly cloudy, with a low around 34.
Monday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 54.
Monday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 35.
Tuesday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 51.
Click Map For Forecast
Disclaimer
Map Legend

ABOUT THIS FORECAST

 
Point Forecast:
6 Miles WNW Arapahoe Peak CO
 40.06°N 105.74°W (Elev. 10095 ft)
Last Update:
2:30 am MDT Sep 18, 2024
Forecast Valid:
8am MDT Sep 18, 2024-6pm MDT Sep 24, 2024
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation