Watching Hurricane Erin; Heavy Rainfall Threat for Upper Midwest; Heatrisk for Mississippi Valley

Hurricane Erin continues to track westward with its outer bands bringing heavy rainfall and gusty winds for Puerto Rico and US Virgin Islands. Life-threatening surf and rip currents are occurring and will spread across the Atlantic coasts this week. Meanwhile, heavy rainfall and possible flooding are in the forecast for upper Midwest through Monday. Heatrisk continues for the Mississippi Valley. Read More >

Current conditions at

USCRN SITE NEAR LEWISTOWN 42WSW (JRWM8)

Lat: 46.88472°NLon: 110.28944°WElev: 5045.0ft.

73°F

23°C

Humidity	39%
Wind Speed	NA NA MPH
Barometer	NA
Dewpoint	46°F (8°C)
Visibility	NA
Last update	17 Aug 11:00 AM MDT

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

5 Miles SW Windham MT

Today
High: 79 °F
Showers
Likely
Tonight
Low: 54 °F
Heavy Rain
then Haze
Monday
High: 84 °F
Haze then
Chance
Showers
Monday Night
Low: 59 °F
Partly Cloudy
Tuesday
High: 91 °F
Sunny
Tuesday Night
Low: 60 °F
Mostly Clear
Wednesday
High: 89 °F
Sunny
Wednesday Night
Low: 56 °F
Partly Cloudy
Thursday
High: 77 °F
Sunny

Detailed Forecast

Today

A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 5pm. Increasing clouds, with a high near 79. East northeast wind 5 to 7 mph becoming northwest in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Tonight

A chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and 11pm. Some of the storms could produce heavy rainfall. Widespread haze after 2am. Cloudy, then gradually becoming partly cloudy, with a low around 54. North wind 7 to 10 mph becoming south in the evening. Chance of precipitation is 50%.

Monday

A chance of showers and thunderstorms between noon and 3pm, then a chance of showers after 3pm. Widespread haze before 9am. Mostly sunny, with a high near 84. Light and variable wind becoming west 5 to 9 mph in the morning. Chance of precipitation is 50%.

Monday Night

Partly cloudy, with a low around 59. North northwest wind around 7 mph becoming south in the evening.

Tuesday

Sunny, with a high near 91. Southwest wind 6 to 9 mph becoming northeast in the afternoon.

Tuesday Night

Mostly clear, with a low around 60. Northeast wind around 8 mph becoming southwest after midnight.

Wednesday

Sunny, with a high near 89. Southwest wind 8 to 11 mph becoming north northwest in the afternoon. Winds could gust as high as 21 mph.

Wednesday Night

Partly cloudy, with a low around 56. North northwest wind 7 to 10 mph becoming west after midnight. Winds could gust as high as 18 mph.

Thursday

Sunny, with a high near 77.