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 >

Hazardous Weather Conditions

Special Weather Statement

Current conditions at

Lewistown, Lewistown Municipal Airport (KLWT)

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

Clear

81°F

27°C

Humidity	39%
Wind Speed	NNE 3 MPH
Barometer	29.98 in (1015.24 mb)
Dewpoint	54°F (12°C)
Visibility	10.00 mi
Heat Index	81°F (27°C)
Last update	17 Aug 04:20 PM MDT

More Information:

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

Extended Forecast for

6 Miles NNE Moore MT

This Afternoon
High: 82 °F
Chance
T-storms
Tonight
Low: 53 °F
Heavy Rain
then Partly
Cloudy
Monday
High: 86 °F
Sunny then
Slight Chance
T-storms
Monday Night
Low: 57 °F
Mostly Clear
Tuesday
High: 93 °F
Sunny
Tuesday Night
Low: 58 °F
Mostly Clear
Wednesday
High: 89 °F
Sunny
Wednesday Night
Low: 55 °F
Slight Chance
T-storms then
Slight Chance
Showers
Thursday
High: 79 °F
Mostly Sunny

Detailed Forecast

This Afternoon

A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 82. North wind around 6 mph.

Tonight

Showers and thunderstorms likely, mainly before 8pm. Some of the storms could produce heavy rainfall. Cloudy during the early evening, then gradual clearing, with a low around 53. South wind 3 to 7 mph. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.

Monday

A 20 percent chance of showers and thunderstorms after 3pm. Sunny, with a high near 86. Calm wind becoming east southeast around 6 mph in the afternoon.

Monday Night

Mostly clear, with a low around 57. North wind 5 to 7 mph becoming south in the evening.

Tuesday

Sunny, with a high near 93. South wind 3 to 6 mph.

Tuesday Night

Mostly clear, with a low around 58. North northeast wind around 7 mph becoming south after midnight.

Wednesday

Sunny, with a high near 89. 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 55. North wind 5 to 9 mph becoming southwest in the evening.

Thursday

Mostly sunny, with a high near 79.