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

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

ROCKY BOY (RCBM8)

Lat: 48.25529°NLon: 109.78592°WElev: 3789.0ft.

NA

65°F

18°C

Humidity 66%
Wind Speed ESE 2 MPH
Barometer NA
Dewpoint 53°F (12°C)
Visibility NA
Last update 30 Jul 09:18 PM MDT
Extended Forecast for

Big Sandy MT

  • Tonight

    Tonight: Mostly clear, with a low around 61. East southeast wind 9 to 11 mph, with gusts as high as 21 mph.

    Low: 61 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 86. East southeast wind 8 to 13 mph, with gusts as high as 21 mph.

    High: 86 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A 30 percent chance of showers and thunderstorms, mainly before midnight. Mostly cloudy, with a low around 62. East wind 6 to 14 mph, with gusts as high as 22 mph.

    Low: 62 °F

    Chance
    T-storms

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 87. East wind around 6 mph.

    High: 87 °F

    Partly Sunny
    then Chance
    T-storms

  • Friday Night

    Friday Night: Showers likely and possibly a thunderstorm before midnight, then a slight chance of showers and thunderstorms between midnight and 3am, then a slight chance of showers after 3am. Mostly cloudy, with a low around 60. East southeast wind 5 to 7 mph becoming calm after midnight. Chance of precipitation is 60%.

    Low: 60 °F

    Showers
    Likely then
    Slight Chance
    T-storms

  • Saturday

    Saturday: A slight chance of showers, then a chance of showers and thunderstorms after noon. Partly sunny, with a high near 82. Calm wind becoming west 5 to 7 mph in the afternoon. Chance of precipitation is 50%.

    High: 82 °F

    Slight Chance
    Showers then
    Chance
    Showers

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms before midnight, then a slight chance of showers. Mostly cloudy, with a low around 58. West northwest wind 5 to 7 mph becoming calm after midnight. Chance of precipitation is 40%.

    Low: 58 °F

    Chance
    Showers

  • Sunday

    Sunday: A chance of showers after noon. Mostly sunny, with a high near 83. Light and variable wind becoming west 5 to 7 mph in the morning.

    High: 83 °F

    Mostly Sunny
    then Chance
    Showers

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 56.

    Low: 56 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 61. East southeast wind 9 to 11 mph, with gusts as high as 21 mph.
Thursday
Mostly sunny, with a high near 86. East southeast wind 8 to 13 mph, with gusts as high as 21 mph.
Thursday Night
A 30 percent chance of showers and thunderstorms, mainly before midnight. Mostly cloudy, with a low around 62. East wind 6 to 14 mph, with gusts as high as 22 mph.
Friday
A 30 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 87. East wind around 6 mph.
Friday Night
Showers likely and possibly a thunderstorm before midnight, then a slight chance of showers and thunderstorms between midnight and 3am, then a slight chance of showers after 3am. Mostly cloudy, with a low around 60. East southeast wind 5 to 7 mph becoming calm after midnight. Chance of precipitation is 60%.
Saturday
A slight chance of showers, then a chance of showers and thunderstorms after noon. Partly sunny, with a high near 82. Calm wind becoming west 5 to 7 mph in the afternoon. Chance of precipitation is 50%.
Saturday Night
A chance of showers and thunderstorms before midnight, then a slight chance of showers. Mostly cloudy, with a low around 58. West northwest wind 5 to 7 mph becoming calm after midnight. Chance of precipitation is 40%.
Sunday
A chance of showers after noon. Mostly sunny, with a high near 83. Light and variable wind becoming west 5 to 7 mph in the morning.
Sunday Night
Partly cloudy, with a low around 56.
Monday
A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 85.
Monday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 56.
Tuesday
A chance of showers. Mostly sunny, with a high near 81.
Tuesday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 55.
Wednesday
Mostly sunny, with a high near 82.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Big Sandy MT
 48.16°N 110.1°W (Elev. 2717 ft)
Last Update:
8:39 pm MDT Jul 30, 2025
Forecast Valid:
9pm MDT Jul 30, 2025-6pm MDT Aug 6, 2025
 
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