Skies will become mostly cloudy tonight, and it will be mild and muggy with patchy areas of fog forming. Showers and thunderstorms will develop, especially from late evening on; some of these thunderstorms may become strong to severe with high winds, hail, and heavy rainfall possible. Temperatures will fall to the middle 70s by late evening; overnight low temperatures will drop to around 70 degrees by morning.
Wednesday will be partly sunny, very warm, and humid with a chance of showers and thunderstorms. High temperatures will be in the upper 80s, with afternoon heat index values from 90 to 95 degrees.
Thursday will be variably cloudy, warm and humid with scattered showers and thunderstorms. High temperatures will be in the middle 80s.
A storm system will drag a cold front through Wisconsin early on Friday. It will be variably cloudy, becoming breezy, and turning cooler and less humid with a slight chance of showers and thunderstorms. High temperatures will be in the upper 70s.
Pleasant and dry weather will return for the weekend. Skies will be partly sunny for both Saturday and Sunday. High temperatures will be in the upper 70s on Saturday and in the lower 80s on Sunday.
Monday will be partly sunny, very warm and humid with a slight chance of showers and thunderstorms; high temperatures will be in the middle 80s, and heat index values will climb back to near 90 degrees. Scattered showers and thunderstorms will become likely form Monday night into Tuesday, otherwise Tuesday will be variably cloudy and remain very warm and humid with high temperatures in the middle 80s, and heat index values from the upper 80s to the lower 90s.
TONIGHT:
Becoming mostly cloudy, very mild, and muggy with areas of fog possible; scattered showers and thunderstorms developing (a few thunderstorms may be strong/severe with high winds, hail, and heavy rainfall).
Low: 70
Wind: S 8-15 MPH
WEDNESDAY:
Partly sunny, very warm, and humid with a chance of showers and thunderstorms.
High: 87; Heat Index: 90 to 95
Wind: S/SW 8-15 MPH
WEDNESDAY NIGHT:
Variable cloudiness, mild, and muggy with a chance of showers and thunderstorms; patchy fog is possible.
Low: 68
Wind: S/SE 6-12 MPH
THURSDAY:
Variable cloudiness, warm, and humid with scattered showers and thunderstorms.
High: 84; Heat Index: 87 to 92
Wind: SE 8-15 MPH
FRIDAY:
Variable cloudiness, becoming breezy, a little cooler, and turning less humid with a slight chance of showers and thunderstorms.
Low: 69
High: 78
SATURDAY:
Partly sunny and pleasant.
Low: 59
High: 77
SUNDAY:
Partly sunny and a little warmer.
Low: 59
High: 82
MONDAY:
Partly sunny, very warm, and more humid with a slight chance of showers and thunderstorms (showers and thunderstorms likely at night).
Low: 62
High: 85; Heat Index: 85 to 90
TUESDAY:
Variable cloudiness, very arm, and humid with scattered showers and thunderstorms.
Low: 68
High: 85; Heat Index: 88 to 93
NOTES:
The Storm Prediction Center says that there is a MODERATE RISK of severe thunderstorms for tonight for south-central and southeastern Minnesota and northeastern Iowa. There is an ENHANCED RISK of severe thunderstorms across the rest of the southern half of Minnesota, the northeastern half of Iowa, extreme northwestern Illinois, and west-central through southwest Wisconsin (west of a Hayward to Stevens Point to Madison to Beloit line), a SLIGHT RISK of severe thunderstorms for the rest of the southeastern three-quarters of Minnesota, the rest of Iowa, the northwestern third of Illinois, and rest of the western three-quarters of Wisconsin (west of a Green Bay to Lake Geneva line), and a MARGINAL RISK of severe thunderstorms for the rest of the southeastern three-quarters of Minnesota, the rest of the northern two-thirds of Illinois, and the rest of Wisconsin. A very warm to hot and increasingly humid air mass will cover much of the Midwest. A weak cold front will move into western Minnesota and far northwestern Iowa. Severe thunderstorms have developed in central Minnesota and northwestern Iowa. Hail, high winds, and heavy rainfall are the main threats, with isolated tornadoes possible where thunderstorm development initially takes place. The thunderstorms will develop into a squall line and will move into the rest of Iowa, Illinois, and Wisconsin later tonight. There is a possibility of widespread wind damage, especially from western Wisconsin into northeastern Iowa, and possibly into northwestern Illinois along the squall line. The thunderstorms may weaken a little overnight, with a threat of isolated severe thunderstorms continuing into the rest of Illinois and eastern Wisconsin, where high winds, hail, and heavy rainfall are the main threats.
There is a SLIGHT RISK of severe thunderstorms Wednesday and Wednesday night for extreme southwestern Minnesota, the western third of Iowa, and the southern third of Illinois and a MARGINAL RISK of severe thunderstorms for the rest of the southern third of Minnesota, the rest of Iowa, the rest of Illinois, and the southeastern three-quarters of Wisconsin (south of a Minneapolis, MN to Eagle River line). Very warm to hot and humid air will continue over the Midwest on Wednesday. Thunderstorms from late Tuesday night may stabilize the atmosphere in Wisconsin and Illinois, but more thunderstorms will develop by late Wednesday afternoon over South Dakota and Nebraska, moving eastward into Iowa and Minnesota, and eventually into Wisconsin and Illinois. High winds, hail, and heavy rainfall are the main threats.
There is a SLIGHT RISK of severe thunderstorms on Thursday and Thursday night across the southern quarter of Minnesota, all of Iowa, the northern half of Illinois, and the southwestern third of Wisconsin (south of a Minneapolis to Stevens Point to Milwaukee line), and a MARGINAL RISK of severe thunderstorms for the rest of the southern half of Minnesota, the rest of the northern three-quarters of Illinois, and the rest of the southwestern half of Minnesota (southwest of a Cumberland to Wausau to Sheboygan line). As a storm system moves through the Midwest, it will interact with a very warm to hot and humid air mass. Cloud cover from previous thunderstorm activity may keep Minnesota and Wisconsin a little cooler than Iowa and Illinois, so thunderstorm development is most likely along the boundary over Iowa between the cloud cooled air to the north and the hot and humid air that get sunshine to the south. These thunderstorms will move eastward into Wisconsin and Illinois on Thursday night. High winds, hail, and heavy rainfall are the main threats, although isolated tornadoes may be possible where the thunderstorms initially develop.
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