Skies will become partly cloudy overnight, and it will be milder. Patchy fog may form overnight Temperatures will fall to the upper 60s by late evening; overnight low temperatures will fall to the middle 60s by morning.
Tuesday will be partly sunny, very warm and also more humid with high temperatures in the upper 80s. Skies will become mostly cloudy on Tuesday night with scattered showers and thunderstorms developing, mainly after midnight. Patchy fog is possible overnight.
Wednesday will be partly sunny, very warm, and humid with a chance of showers and thunderstorms; high temperatures will be near 90 degrees, while afternoon heat index readings will be in the middle 90s. Thursday will ve variably cloudy, very warm, and humid with scattered showers and thunderstorms. High temperatures will be in the upper 80s, with heat index values in the middle 90s as well.
A stormsystem 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; high temperatures will be in the lower 80s. The threat of showers and thunderstorms should end later on Friday or on Friday evening.
For next weekend, pleasant and dry weather will return, and humidity levels will be down as well. Skies will be partly sunny skies 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 more humid with high temperatures in the middle 80s, and heat index values will climb back to near 90 degrees. There will be a chance of showers and thunderstorms on Monday night.
TONIGHT:
Becoming partly cloudy and milder; patchy areas of fog are possible.
Low: 62
Wind: SW 5-10 MPH
TUESDAY:
Partly sunny, very warm, and more humid.
High: 87; Heat Index: 90 to 95
Wind: S/SW 8-15 MPH
TUESDAY NIGHT:
Becoming mostly cloudy, very mild, and muggy with scattered showers and thunderstorms developing, mainly after midnight; 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: S 8-15 MPH
THURSDAY:
Variable cloudiness, very warm, and humid with scattered showers and thunderstorms.
Low: 70
High: 89; Heat Index: 92 to 97
FRIDAY:
Mostly cloudy and humid, but not as warm with scattered showers and thunderstorms ending late in the day or in the evening.
Low: 71
High: 82
SATURDAY:
Partly sunny, a little cooler, and less humid.
Low: 59
High: 77
SUNDAY:
Partly sunny and a little warmer.
Low: 57
High: 82
MONDAY:
Partly sunny, very warm, and more humid (a chance of showers and thunderstorms at night).
Low: 60
High: 85; Heat Index: 85 to 90
NOTES:
The Storm Prediction Center says that there is an ENHANCED RISK of severe thunderstorms for Tuesday and Tuesday night across the southern half of Minnesota, north-central Iowa, and west-central Wisconsin (west of a Superior to Medford to Prairie du Chien line), a SLIGHT RISK of severe thunderstorms for the rest of the southeastern three-quarters of Minnesota, the rest of Iowa, far northwestern Illinois, and rest of the western three-quarters of Wisconsin (west of a Green Bay to Beaver Dam to Beloit line), and a MARGINAL RISK of severe thunderstorms for the rest of Minnesota, the rest of the northwestern third of Illinois, and the rest of Wisconsin. A very warm to hot 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 from western Wisconsin into northeastern Iowa, and possibly into northwestern Illinois. 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.
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 northern 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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