Skies will become partly sunny this afternoon with highs reaching the middle 80s. It will be more humid today as well. Heat index values will reach the middle 80s to near 90 degrees. Skies will become mostly cloudy again tonight with scattered showers and thunderstorms developing, mainly late. Some storms could become strong or severe. Patchy fog is possible overnight. Temperatures will fall to around 70 degrees by early Wednesday morning.
Wednesday will be partly sunny, very warm and humid with a chance of showers and thunderstorms, mainly early and again in the afternoon. High temperatures will be near 90 degrees while afternoon heat index readings will be in the middle 90s. Thursday will be variably cloudy, warm and humid with scattered showers and thunderstorms, especially in the afternoon and at night. High temperatures will be in the middle 80s.
A storm system will drag a cold front through Wisconsin on Friday. It will be mostly cloudy and humid, but not as warm on Friday with scattered showers and thunderstorms, mainly in the morning. High temperatures will be in the lower 80s.
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. Sunday will start to become more humid again.
Monday will be partly sunny, very warm and humid with high temperatures in the middle to upper 80s, and heat index values will climb back to near 90 degrees. There will be a chance of showers and thunderstorms on Monday night.
THIS AFTERNOON:
Partly sunny, warm and more humid
High: 85; Heat Index: 85 to 90
Wind: SSW 8-15 MPH
TONIGHT:
Becoming mostly cloudy, very mild and muggy with scattered showers and thunderstorms developing, mainly late; areas of fog are possible
Low: 70
Wind: S 8-15 MPH
WEDNESDAY:
Partly sunny, very warm and humid with a chance of showers and thunderstorms
High: 89; Heat Index: 92 to 97
Wind: SSW 8-15 MPH
THURSDAY:
Variable cloudiness, warm and humid with scattered showers and thunderstorms
Low: 68
High: 84
FRIDAY:
Variable cloudiness and humid, but not as warm with scattered showers and thunderstorms, mainly in the morning
Low: 69
High: 82
SATURDAY:
Partly sunny, a little cooler and less humid
Low: 59
High: 77
SUNDAY:
Partly sunny, warmer and turning more humid
Low: 59
High: 82
MONDAY:
Partly sunny, very warm and humid (a chance of showers and thunderstorms at night)
Low: 62
High: 85; Heat Index: 85 to 90
NOTES:
The Storm Prediction Center says that there is an ENHANCED RISK of severe thunderstorms today and tonight across the southern half of Minnesota, far northern Iowa, and west-central Wisconsin (west of a Minong to Marshfield to Viroqua line), a SLIGHT RISK of severe thunderstorms for the rest of the southeastern three-quarters of Minnesota, the northwest half of Iowa, and rest of the western three-quarters of Wisconsin (west of a Green Bay to Baraboo to Lancaster line), and a MARGINAL RISK of severe thunderstorms for the rest of Minnesota, the northwestern third of Illinois, and the rest of Wisconsin. A very warm and increasingly humid air mass will cover much of the Midwest on Tuesday afternoon and evening. A weak cold front will move into western Minnesota and far northwestern Iowa by Tuesday afternoon. Thunderstorms will develop along and ahead of this cold front, with some thunderstorms becoming severe. Hail, high winds, and heavy rainfall are the main threats, with isolated tornadoes possible where thunderstorm development initially takes place. The thunderstorms will move into the rest of Iowa, Illinois, and Wisconsin on Tuesday night, with some threat of a squall line developing, leading to a possibility of more widespread wind damage, especially in western Wisconsin. The thunderstorms will gradually weaken overnight.
Because the warm and humid air mass will remain over the Midwest through Friday, there may be additional chances for severe thunderstorms on Wednesday, Thursday, and Friday. The severe weather threat on any given day may depend in large part on lingering cloud cover and precipitation (if any) from thunderstorms on the previous day and the effect that this will have on temperatures. Right now, the best severe weather chances for Wednesday will favor southern Minnesota, the western half of Iowa, and southern Wisconsin. Another round of severe thunderstorms may be more likely in the Thursday night/Friday time frame through much of southern Minnesota, Iowa, northern Illinois, and much of Wisconsin.
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