Tonight will be partly cloudy, warm and very muggy with any showers and thunderstorms ending. Some patchy fog may develop overnight. Temperatures will fall into the upper 70s by late evening; overnight low temperatures will fall to the middle 70s by morning. Heat index values will make it feel more like 80 to 85 degrees through the night.
Thursday will be partly sunny, breezy, hot, and humid. High temperatures will climb to the middle 90s; with afternoon heat index values around 105 degrees. For that reason, the National Weather Service has issued an Excessive Heat Warning throughout all of southern Wisconsin from noon Thursday through 7 PM Friday evening. Some showers and thunderstorms will develop in northern Wisconsin on Thursday along a weak cold front, and may reach southern Wisconsin on Thursday night. Thursday night will remain warm and very muggy with lows in the upper 70s, and heat index values in the 80s.
Friday will be partly sunny, hot and humid with a slight chance of showers and thunderstorms. High temperatures will reach the lower 90s, and heat index values will once again push into the triple digits. If the thunderstorms miss southern Wisconsin, Friday could be a few degrees hotter than forecast.
For the weekend, Saturday will be variably cloudy, hot and humid with high temperatures near 90 degrees. Heat index values will be in the upper 90s to around 100 degrees. There will be a chance of showers and thunderstorms Saturday as a weak cold front in Illinois tries to push northward as a warm front toward Wisconsin. The chance of showers and thunderstorms will continue Sunday as a cold front moves to the southeast through Wisconsin. Sunday will be variably cloudy, very warm and humid with highs in the upper 80s, and heat index values will be in the middle to upper 90s.
Monday and Tuesday will be partly sunny, very warm, and a little less humid with high temperatures in the middle 80s and heat index values in the upper 80s.
Wednesday will be variably cloudy, very warm, and a little more humid with a chance of showers and thunderstorms. Highs will reach the middle 80s, with heat index values in the upper 80s to the lower 90s.
***EXCESSIVE HEAT WARNING FROM NOON THURSDAY THROUGH 7 PM FRIDAY EVENING***
TONIGHT:
Partly cloudy, warm, and very muggy with any showers and thunderstorms ending; patchy fog is possible.
Low: 74; Heat Index: 80 to 85
Wind: S 8-15 MPH
THURSDAY:
Partly sunny, breezy, hot, and humid.
High: 94; Heat Index: 102 to 107
Wind: S/SW 10-20 MPH
THURSDAY NIGHT:
Partly cloudy, warm, and very muggy with a chance of showers and thunderstorms; patchy fog is possible.
Low: 77; Heat Index: 82 to 87
Wind: S/SW 6-12 MPH
FRIDAY:
Partly sunny, hot, and humid with a slight chance of showers and thunderstorms.
High: 93; Heat Index: 100 to 105
Wind: S/SW 8-15 MPH
SATURDAY:
Variable cloudiness, hot, and humid with a chance of showers and thunderstorms.
Low: 70
High: 90; Heat Index: 95 to 100
SUNDAY:
Variable cloudiness, very warm, and humid with a chance of showers and thunderstorms.
Low: 72
High: 89; Heat Index: 94 to 99
MONDAY:
Partly sunny, very warm, and turning a little less humid.
Low: 66
High: 85; Heat Index: 85 to 90
TUESDAY:
Partly sunny and continued very warm.
Low: 65
High: 86; Heat Index: 86 to 91
WEDNESDAY:
Variable cloudiness, very warm, and a little more humid with a chance of showers and thunderstorms.
Low: 66
High: 86; Heat Index: 88 to 93
NOTES:
An EXCESSIVE HEAT WARNING has been issued for from 7 AM Thursday morning until 7 PM Saturday evening for eastern Iowa and northwestern Illinois. In Iowa, this includes the counties of DELAWARE and DUBUQUE. In Illinois, this includes the counties of JO DAVIESS and STEPHENSON.
An EXCESSIVE HEAT WARNING has been issued from noon Thursday until 7 PM Friday evening for northeastern Iowa, north-central and northeastern Illinois, and southwestern, west-central, east-central, south-central, and southeastern Wisconsin. In Iowa, this includes the counties of ALLAMAKEE and CLAYTON. In Illinois, this includes the counties of WINNEBAGO, BOONE, and McHENRY (this includes the Rockford and Chicago metropolitan areas). In Wisconsin, this includes the counties of MONROE, JUNEAU, ADAMS, MARQUETTE, GREEN LAKE, VERNON, RICHLAND, SAUK, COLUMBIA, DODGE, CRAWFORD, IOWA, DANE, JEFFERSON, GRANT, LAFAYETTE, GREEN, ROCK, and WALWORTH (this includes the La Crosse, Madison, and Milwaukee metropolitan areas).
The Storm Prediction Center says there is a SLIGHT RISK of severe thunderstorms for tonight for the northern third of Minnesota, and a MARGINAL RISK of severe thunderstorms for the rest of northern and eastern Minnesota, the eastern third of Iowa, the western half of Illinois, and all of Wisconsin (except for the far southeastern portion). As hot and humid air expands to the north and east, the area for potential thunderstorm development will shift to Minnesota and Wisconsin. Thunderstorms may develop from northern Minnesota into eastern Iowa and Wisconsin, heading southeastward into Illinois. Isolated severe thunderstorms may also be possible, with high winds, hail, and heavy rainfall as the main threats.
There is a SLIGHT RISK of severe thunderstorms for Thursday and Thursday night over the northeastern third of Wisconsin (east of an Iron Mountain, MI to Oshkosh to Milwaukee line), and a MARGINAL RISK of severe thunderstorms for the southeastern half of Minnesota, extreme northern Iowa, northeastern Illinois, and the rest of Wisconsin. A hot and humid air mass will cover the Midwest on Thursday. Thunderstorms will develop on the northern edge of the heat in northern Wisconsin on Thursday afternoon, and head to the south and southeast on Thursday night. High winds, some hail, and heavy rainfall are the main threats.
Interactive radar
Radar images (Mobile radar images)
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