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

Lewistown, Lewistown Municipal Airport (KLWT)

Lat: 47.04917°NLon: 109.46639°WElev: 4167.0ft.

Partly Cloudy

59°F

15°C

Humidity	89%
Wind Speed	SSE 9 MPH
Barometer	30.04 in (1017.27 mb)
Dewpoint	56°F (13°C)
Visibility	10.00 mi
Last update	17 Aug 06:24 PM MDT

More Information:

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

Extended Forecast for

4 Miles ESE Moore MT

Tonight
Low: 54 °F
Showers
Likely then
Haze
Monday
High: 84 °F
Haze then
Slight Chance
T-storms
Monday Night
Low: 58 °F
Mostly Clear
Tuesday
High: 90 °F
Sunny
Tuesday Night
Low: 59 °F
Mostly Clear
Wednesday
High: 87 °F
Sunny
Wednesday Night
Low: 56 °F
Slight Chance
T-storms then
Slight Chance
Showers
Thursday
High: 77 °F
Mostly Sunny
Thursday Night
Low: 51 °F
Mostly Clear

Detailed Forecast

Tonight

Showers and thunderstorms likely, mainly before 10pm. Widespread haze after 4am. Cloudy during the early evening, then gradual clearing, with a low around 54. South wind 5 to 7 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Monday

A 20 percent chance of showers and thunderstorms after 3pm. Widespread haze before 7am. Sunny, with a high near 84. Light and variable wind becoming south southwest around 6 mph in the afternoon.

Monday Night

Mostly clear, with a low around 58. West wind 5 to 7 mph becoming east northeast in the evening.

Tuesday

Sunny, with a high near 90. South wind 3 to 6 mph.

Tuesday Night

Mostly clear, with a low around 59. North northwest wind around 7 mph becoming south southeast after midnight.

Wednesday

Sunny, with a high near 87. South southwest wind 6 to 9 mph becoming north northwest in the afternoon. Winds could gust as high as 18 mph.

Wednesday Night

A slight chance of showers and thunderstorms. Partly cloudy, with a low around 56. North wind 6 to 8 mph becoming west southwest after midnight. Chance of precipitation is 20%.

Thursday

Mostly sunny, with a high near 77. West wind 5 to 8 mph becoming north northwest in the afternoon.

Thursday Night

Mostly clear, with a low around 51.

Friday

Sunny, with a high near 72.

Friday Night

Mostly clear, with a low around 49.

Saturday

Sunny, with a high near 75.

Saturday Night

Mostly clear, with a low around 50.