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

TOSTON (TOSM)

Lat: 46.12222°NLon: 111.49472°WElev: 4058.0ft.

72°F

22°C

Humidity	48%
Wind Speed	W 4 MPH
Barometer	NA
Dewpoint	51°F (11°C)
Visibility	NA
Last update	17 Aug 12:00 PM MDT

More Information:

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

Extended Forecast for

6 Miles SSE Toston MT

This Afternoon
High: 83 °F
Showers
Likely
Tonight
Low: 50 °F
Chance
T-storms then
Haze
Monday
High: 89 °F
Mostly Sunny
then Slight
Chance
Showers
Monday Night
Low: 53 °F
Haze
Tuesday
High: 95 °F
Sunny
Tuesday Night
Low: 53 °F
Mostly Clear
Wednesday
High: 92 °F
Sunny
Wednesday Night
Low: 53 °F
Partly Cloudy
Thursday
High: 87 °F
Sunny

Detailed Forecast

This Afternoon

A chance of showers and thunderstorms between 2pm and 4pm, then showers likely and possibly a thunderstorm after 4pm. Increasing clouds, with a high near 83. West northwest wind 5 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Tonight

A 50 percent chance of showers and thunderstorms, mainly before 7pm. Widespread haze between 1am and 4am. Mostly cloudy, with a low around 50. West wind 5 to 10 mph becoming light and variable after midnight. Winds could gust as high as 21 mph.

Monday

A 20 percent chance of showers after noon. Mostly sunny, with a high near 89. Light and variable wind becoming west southwest 5 to 8 mph in the morning. Winds could gust as high as 20 mph.

Monday Night

Widespread haze before 1am. Partly cloudy, with a low around 53. Northwest wind 5 to 7 mph becoming calm after midnight.

Tuesday

Sunny, with a high near 95. Light and variable wind becoming southwest around 6 mph in the afternoon.

Tuesday Night

Mostly clear, with a low around 53. South southwest wind around 6 mph becoming light and variable after midnight.

Wednesday

Sunny, with a high near 92. Light and variable wind becoming west northwest 5 to 9 mph in the afternoon. Winds could gust as high as 21 mph.

Wednesday Night

Partly cloudy, with a low around 53. North northwest wind 5 to 11 mph, with gusts as high as 23 mph.

Thursday

Sunny, with a high near 87.