Thunderstorms and Heavy Rainfall in the Mid-Atlantic; Fire Weather Concerns in the West

Thunderstorms are expected to bring heavy rain and potential significant flash and urban flooding to the Mid-Atlantic on Thursday, especially along the I-95 urban corridor. Dry conditions, gusty winds, and isolated dry thunderstorms will continue to bring a critical fire weather threat to the northwestern Great Basin into the interior Northwest through Thursday. Read More >

Hazardous Weather Conditions

Current conditions at

Granby-Grand County Airport (KGNB)

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

Fair

56°F

13°C

Humidity 60%
Wind Speed N 7 mph
Barometer 30.53 in
Dewpoint 42°F (6°C)
Visibility 10.00 mi
Last update 30 Jul 9:35 pm MDT
Extended Forecast for

2 Miles NW Saint Marys Glacier CO

  • Tonight

    Tonight: A 30 percent chance of showers before midnight.  Partly cloudy, with a low around 41. South southeast wind 9 to 11 mph becoming southwest after midnight. Winds could gust as high as 18 mph.

    Low: 41 °F

    Chance
    Showers then
    Mostly Clear

  • Thursday

    Thursday: Showers likely and possibly a thunderstorm between noon and 3pm, then showers and thunderstorms likely after 3pm.  Increasing clouds, with a high near 61. Southwest wind 9 to 13 mph becoming west northwest in the afternoon. Winds could gust as high as 21 mph.  Chance of precipitation is 70%.

    High: 61 °F

    Sunny then
    T-storms
    Likely

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and midnight.  Mostly cloudy, then gradually becoming mostly clear, with a low around 43. East wind 9 to 14 mph becoming west southwest after midnight. Winds could gust as high as 24 mph.  Chance of precipitation is 40%.

    Low: 43 °F

    Chance
    T-storms then
    Partly Cloudy

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms after noon.  Partly sunny, with a high near 60. West wind 9 to 14 mph, with gusts as high as 24 mph.

    High: 60 °F

    Mostly Sunny
    then Chance
    T-storms

  • Friday Night

    Friday Night: A slight chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and midnight.  Mostly clear, with a low around 44. Breezy, with a west southwest wind 9 to 15 mph, with gusts as high as 25 mph.  Chance of precipitation is 20%.

    Low: 44 °F

    Slight Chance
    T-storms then
    Mostly Clear
    and Breezy

  • Saturday

    Saturday: A 40 percent chance of showers and thunderstorms after noon.  Mostly sunny, with a high near 63. Breezy.

    High: 63 °F

    Sunny and
    Breezy then
    Chance
    T-storms

  • Saturday Night

    Saturday 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 44. Chance of precipitation is 20%.

    Low: 44 °F

    Slight Chance
    T-storms then
    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 62. Breezy.

    High: 62 °F

    Sunny then
    Mostly Sunny
    and Breezy

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 43.

    Low: 43 °F

    Mostly Clear

Detailed Forecast

Tonight
A 30 percent chance of showers before midnight. Partly cloudy, with a low around 41. South southeast wind 9 to 11 mph becoming southwest after midnight. Winds could gust as high as 18 mph.
Thursday
Showers likely and possibly a thunderstorm between noon and 3pm, then showers and thunderstorms likely after 3pm. Increasing clouds, with a high near 61. Southwest wind 9 to 13 mph becoming west northwest in the afternoon. Winds could gust as high as 21 mph. Chance of precipitation is 70%.
Thursday Night
A chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and midnight. Mostly cloudy, then gradually becoming mostly clear, with a low around 43. East wind 9 to 14 mph becoming west southwest after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 40%.
Friday
A 30 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 60. West wind 9 to 14 mph, with gusts as high as 24 mph.
Friday Night
A slight chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and midnight. Mostly clear, with a low around 44. Breezy, with a west southwest wind 9 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
Saturday
A 40 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 63. Breezy.
Saturday 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 44. Chance of precipitation is 20%.
Sunday
Sunny, with a high near 62. Breezy.
Sunday Night
Mostly clear, with a low around 43.
Monday
A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 64.
Monday Night
Partly cloudy, with a low around 46. Breezy.
Tuesday
Mostly sunny, with a high near 65. Breezy.
Tuesday Night
Partly cloudy, with a low around 46. Breezy.
Wednesday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 65. Breezy.
Basemap Options
Click map to change the forecast location
Loading map...

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NW Saint Marys Glacier CO
 39.87°N 105.66°W (Elev. 10620 ft)
3:03 pm MDT Jul 30, 2025
9pm MDT Jul 30, 2025-6pm MDT Aug 6, 2025
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database