Areas of Dangerous Heat and Heavy Rain with Possible Flooding into this Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend with heat advisories in effect. Heavy to excessive rainfall occurring at times through Sunday could bring areas of flooding to parts of the upper Midwest, central Great Lakes, southern New England and Virginia/North Carolina tidewater region. Read More >

Current conditions at

Sieben I-15 MP 216 (MTSBN)

Lat: 46.88748267° N Lon: 112.1111196° W Elev: 4199.0 ft.

NA

55°F

13°C

Humidity 79%
Wind Speed SSE 3 MPH
Barometer NA
Dewpoint 49°F (9°C)
Visibility NA
Last update 18 Sep 01:30 AM MDT
Detailed forecast for

Upper Blackfoot and MacDonald Pass

Rest Of Tonight
Mostly cloudy. Rain showers likely and chance of thunderstorms. Highs 61 to 69. Lows 44 to 50. North winds up to 10 mph. Chance of precipitation 70 percent.
Saturday
Cloudy. Patchy fog in the morning. Chance of rain in the morning, then chance of rain showers and slight chance of thunderstorms in the afternoon. Highs 52 to 62. Northeast winds up to 10 mph. Chance of precipitation 50 percent.
Saturday Night
Mostly cloudy with a 20 percent chance of rain showers in the evening, then partly cloudy after midnight. Patchy fog after midnight. Lows in the lower 40s. North winds up to 5 mph shifting to the west after midnight.
Sunday
Warmer, sunny. Patchy fog in the morning. Highs 62 to 70. West winds up to 5 mph.
Sunday Night
Mostly clear. Lows in the mid 40s. Southwest winds up to 5 mph.
Monday Through Thursday
Mostly clear. Highs 63 to 73. Lows in the mid 40s.
Thursday Night And Friday
Partly cloudy. Lows 45 to 51. Highs 64 to 72.



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1232 AM MDT Fri Sep 18 2026
 
 

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database