Severe Thunderstorms and Heavy Rainfall Across the Midwest into the Great Lakes Region; Significant Heat in the Southwest

Strong to severe storms may produce damaging winds, isolated hail, and a few tornadoes from the Midwest into the lower Great Lakes. These storms may also produce areas of heavy rain and flash flooding. Significant heat will continue across parts of the Desert Southwest into western Texas and north Alaska. Dangerous heat will also build into the Eastern and Central U.S. and continue into next week. Read More >

Hazardous Weather Conditions

Current conditions at

Sparta, Sparta / Fort McCoy Airport (KCMY)

Lat: 43.96°NLon: 90.74°WElev: 837ft.

Partly Cloudy

75°F

24°C

Humidity	74%
Wind Speed	Calm
Barometer	29.74 in (1007.0 mb)
Dewpoint	66°F (19°C)
Visibility	8.00 mi
Last update	18 Jun 6:55 pm CDT

More Information:

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

Extended Forecast for

Ontario WI

Extreme Heat Watch June 21, 12:00pm until June 22, 09:00pm

Click here for hazard details and duration

Extreme Heat Watch

Tonight
Low: 60 °F
Chance
T-storms
Juneteenth
High: 84 °F
Sunny
Thursday Night
Low: 64 °F
Chance
Showers
Friday
High: 85 °F
Chance
T-storms
Friday Night
Low: 74 °F
Slight Chance
T-storms
Saturday
High: 94 °F
Mostly Sunny
Saturday Night
Low: 77 °F
Mostly Clear
Sunday
High: 95 °F
Sunny then
Sunny and
Breezy
Sunday Night
Low: 76 °F
Clear then
Slight Chance
Showers

Detailed Forecast

Tonight

A chance of showers and thunderstorms before 1am, then a slight chance of showers between 1am and 2am. Mostly cloudy, with a low around 60. Calm wind. Chance of precipitation is 30%.

Juneteenth

Sunny, with a high near 84. Calm wind becoming west 5 to 7 mph in the morning.

Thursday Night

A 30 percent chance of showers, mainly after 3am. Partly cloudy, with a low around 64. Light southwest wind.

Friday

A 40 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 85. South wind 6 to 11 mph, with gusts as high as 22 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Friday Night

A slight chance of showers and thunderstorms. Partly cloudy, with a low around 74. South wind 9 to 13 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.

Saturday

Mostly sunny, with a high near 94. Southwest wind around 15 mph, with gusts as high as 26 mph.

Saturday Night

Mostly clear, with a low around 77. South wind around 10 mph, with gusts as high as 24 mph.

Sunday

Sunny and hot, with a high near 95. Breezy, with a south wind 10 to 16 mph, with gusts as high as 28 mph.

Sunday Night

A 20 percent chance of showers after 1am. Mostly clear, with a low around 76. South wind 10 to 13 mph, with gusts as high as 24 mph.

Monday

A 50 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 91. Southwest wind 8 to 10 mph, with gusts as high as 20 mph.

Monday Night

Showers and possibly a thunderstorm. Low around 68. West wind around 6 mph becoming calm in the evening. Chance of precipitation is 80%.

Tuesday

Showers and possibly a thunderstorm. High near 83. Calm wind becoming west around 6 mph in the afternoon. Chance of precipitation is 80%.

Tuesday Night

Showers and possibly a thunderstorm. Low around 63. North wind around 5 mph becoming calm in the evening. Chance of precipitation is 80%.

Wednesday

Showers and possibly a thunderstorm. High near 77. East wind 5 to 7 mph becoming south in the afternoon. Chance of precipitation is 80%.