Tonight will be variably cloudy, warm and very muggy with scattered showers and thunderstorms developing as a front sags south through Wisconsin. Patchy fog is also possible. Temperatures will fall into the middle 70s by early Friday and heat index values may stay in the lower to middle 80s overnight. Excessive Heat Warnings and a Heat Advisory will remain in effect for much of southern Wisconsin through 7 p.m. on Friday.
The front will linger across northern Illinois or southern Wisconsin on Friday. Friday will be partly sunny, hot and humid with a chance of showers and thunderstorms. High temperatures will reach the lower 90s, and heat index values will reach the triple digits. Friday night will be partly cloudy, mild and muggy with patchy fog possible. Temperatures will fall to around 70 degrees by early Saturday morning.
For the weekend, Saturday will be partly sunny, hot and humid with high temperatures in the lower 90s. Heat index values will be in the upper 90s to around 100 degrees. A chance of showers and thunderstorms will develop, mainly later in the day, and showers and thunderstorms will become more likely at night. Sunday will be variably cloudy, very warm and humid with scattered showers and thunderstorms. Highs will be 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 humid with high temperatures in the middle 80s and heat index values in the upper 80s and lower 90s.
Wednesday through Friday will be variably cloudy, very warm and humid with chances of showers and thunderstorms. Highs will reach the middle 80s Wednesday with heat index values in the upper 80s to the lower 90s. Thursday and Friday will be slightly cooler with highs in the lower 80s.
***EXCESSIVE HEAT WARNING UNTIL 7 PM FRIDAY EVENING FOR AREAS WEST AND SOUTHWEST OF DANE COUNTY***
***HEAT ADVISORY UNTIL 7 PM FRIDAY EVENING FOR DANE COUNTY AND AREAS TO THE NORTHWEST AND SOUTHEAST***
TONIGHT:
Variable cloudiness, warm, and very muggy with scattered showers and thunderstorms; patchy fog is possible.
Low: 75; Heat Index: 80 to 85
Wind: SW 6-12 MPH
FRIDAY:
Partly sunny, hot, and humid with a chance of showers and thunderstorms.
High: 93; Heat Index: 100 to 105
Wind: Light and Variable
FRIDAY NIGHT:
Partly cloudy, mild, and muggy with patchy fog possible.
Low: 70
Wind: Light and Variable
SATURDAY:
Partly sunny, hot, and humid with a chance of showers and thunderstorms late in the day.
High: 92; Heat Index: 97 to 102
Wind: SE 6-12 MPH
SUNDAY:
Variable cloudiness, very warm, and humid with scattered showers and thunderstorms.
Low: 72
High: 89; Heat Index: 94 to 99
MONDAY:
Partly sunny, very warm, and humid.
Low: 68
High: 85; Heat Index: 87 to 92
TUESDAY:
Partly sunny, very warm, and humid.
Low: 65
High: 86; Heat Index: 88 to 93
WEDNESDAY:
Variable cloudiness, very warm, and humid with scattered showers and thunderstorms.
Low: 66
High: 86; Heat Index: 88 to 93
THURSDAY:
Variable cloudiness, warm, and humid with a chance of showers and thunderstorms.
Low: 68
High: 83
FRIDAY:
Variable cloudiness, warm, and humid with a chance of showers and thunderstorms.
Low: 63
High: 82
NOTES:
An EXCESSIVE HEAT WARNING is in effect 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 is in effect until 7 PM Friday evening for northeastern Iowa, north-central and northeastern Illinois, and southwestern, and parts of west-central and south-central 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 VERNON, RICHLAND, CRAWFORD, IOWA, GRANT, LAFAYETTE, and GREEN (this includes the La Crosse metropolitan area).
A HEAT ADVISORY is in effect until 7 PM Friday evening for parts of west-central, south-central, and southeastern Wisconsin, including the counties of MONROE, JUNEAU, ADAMS, SAUK, DANE, JEFFERSON, ROCK, and WALWORTH (this includes the Madison and Milwaukee metropolitan areas).
The Storm Prediction Center says that there is a MARGINAL RISK of severe thunderstorms for tonight for the southern third of Minnesota, the northern two-thirds of Iowa, the northern quarter of Illinois, and the southern two-thirds of Wisconsin (south of a Minneapolis, MN to Rhinelander to Marinette line). A hot and humid air mass will cover the Midwest, although morning thunderstorms have stabilized the atmosphere somewhat over northern and northeastern Wisconsin. Thunderstorms have redeveloped on the northern edge of the heat in central Wisconsin, and should continue into southern Wisconsin tonight. Additional thunderstorms may develop over southern Minnesota, heading into Iowa, southern Wisconsin, and northern Illinois tonight. Isolated severe thunderstorms are possible, with high winds, hail, and heavy rainfall as the main threats.
There is a SLIGHT RISK of severe thunderstorms for Saturday and Saturday night over all of Minnesota, and the northwestern third of Wisconsin (west of a La Crosse to Wisconsin Rapids to Eagle River line), and a MARGINAL RISK of severe thunderstorms over most of Iowa, most of Illinois, and the rest of Wisconsin. A weak warm front will approach southern Wisconsin by late Saturday afternoon, as a cold front moves into western Minnesota. Strong to severe thunderstorms may develop from later Saturday afternoon into Saturday night along both of these fronts. High winds, hail, and heavy rainfall will be the main threats.
Interactive radar
Radar images (Mobile radar images)
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