Severe thunderstorms will end early this morning, but will may redevelop in the afternoon or evening, and will once again have the potential to be severe. Skies will be variably cloudy, and it will remain very warm and humid with high temperatures reaching the upper 80s with heat index values into the lower 90s. Showers and thunderstorms will end tonight with the passage of a weak cold front.
On Tuesday, another weak cold front will move through Wisconsin. Expect variably cloudy skies, warm and humid conditions, with a chance for showers and thunderstorms again. High temperatures will be in the middle 80s. Skies will clear out Tuesday night and humidity levels will decrease a little.
Wednesday will be partly sunny, not quite as warm, and a little less humid with high temperatures in the lower 80s. On Thursday, another low pressure system will develop to our west leading to variably cloudy skies and another chance for showers and thunderstorms. High temperatures will remain in the lower 80s, and humidity levels will increase again. Friday will be partly sunny, very warm, and humid with just a slight chance for showers and thunderstorms. High temperatures will be in the upper 80s, with heat index readings in the lower to middle 90s.
Very warm to hot and humid weather will continue into next weekend. Saturday will be partly sunny, hot, and humid with a slight chance for showers and thunderstorms; high temperatures will be around 90 degrees, with heat index values will be in the upper 90s to around 100 degrees. A cold front will move through Wisconsin from Saturday night into Sunday. Skies on Sunday will be variably cloudy, and it will be very warm and humid with scattered showers and thunderstorms,; high temperatures will be in the upper 80s.
***SEVERE THUNDERSTORM WATCH FOR AREAS SOUTH AND EAST OF DANE COUNTY UNTIL 10 AM***
TODAY:
Mostly cloudy with showers and thunderstorms early; some thunderstorms may be severe with high winds, hail, and heavy rainfall. Variable cloudiness, very warm and humid this afternoon with showers and thunderstorms redeveloping, mainly late in the day; some thunderstorms may be severe.
High: 87; Heat Index: 89 to 94
Wind: S/SW 8-15 MPH
TONIGHT:
Mostly cloudy, mild, and muggy with scattered showers and thunderstorms, mainly in the evening; some thunderstorms may be severe early.
Low: 68
Wind: N/NW 5-10 MPH
TUESDAY:
Variable cloudiness, warm, and humid with a chance for showers and thunderstorms.
High: 84
Wind: N 8-15 MPH
TUESDAY NIGHT:
Becoming mostly clear, a little cooler, and less humid; areas of fog are possible toward morning.
Low: 58
Wind: N/NE 5-10 MPH
WEDNESDAY:
Partly sunny, warm, but a little less humid.
High: 82
Wind: NE 8-15 MPH
THURSDAY:
Variable cloudiness, warm, and more humid with scattered showers and thunderstorms developing.
Low: 62
High: 82
FRIDAY:
Partly sunny, very warm, and humid with a slight chance for showers and thunderstorms.
Low: 68
High: 88; Heat Index: 90 to 95
SATURDAY:
Partly sunny, hot, and humid with a slight chance for showers and thunderstorms.
Low: 71
High: 90; Heat Index: 93 to 98
SUNDAY:
Variable cloudiness, very warm, and humid with a chance for showers and thunderstorms.
Low: 72
High: 88; Heat Index: 90 to 95
NOTES:
A SEVERE THUNDERSTORM WATCH is in effect until 10 AM for northern Illinois, and southeastern and far south-central Wisconsin. In Illinois, this includes the counties of JO DAVIESS, STEPHENSON, WINNEBAGO, BOONE, and McHENRY (this includes the Rockford and Chicago metropolitan areas). In Wisconsin, this includes the counties of JEFFERSON, LAFAYETTE, GREEN, ROCK, and WALWORTH (this includes the Milwaukee metropolitan area).
A FLASH FLOOD WATCH is in effect until 1 AM early Tuesday morning for north-central and northeastern Illinois, including the counties of WINNEBAGO, BOONE, and McHENRY (this includes the Rockford and Chicago metropolitan areas).
The Storm Prediction Center says that there is a MODERATE RISK for widespread severe thunderstorms, along with some intense severe thunderstorms for Monday and Monday night over much of Illinois. There is an ENHANCED RISK for a few severe thunderstorms along with isolated intense severe thunderstorms for the southeastern quarter of Iowa, the rest of Illinois, and for southwestern and south-central Wisconsin (south and west of a line from Prairie du Chien to Madison to Kenosha). There is a SLIGHT RISK for a few severe thunderstorms over the rest of the southeastern third of Iowa, and the rest of the southern third of Wisconsin (south of a La Crosse to Wausau to Green Bay line). There is a MARGINAL RISK for isolated severe thunderstorms for central, east-central, and southeastern Minnesota, the rest of the southeastern two-thirds of Iowa, and the rest of Wisconsin.
Strong to occasionally severe thunderstorms in eastern Iowa and southern Wisconsin early this morning will gradually weaken as they push into northern Illinois, with high winds, hail, and heavy rainfall as the main threats. As these storms weaken, they may leave an outflow boundary over northern Illinois into eastern Iowa.
By afternoon, a weak cold front will move southeastward through Wisconsin. As clouds thin and very warm to hot and very humid conditions develop, an extremely unstable atmosphere will be in place across the central Midwest. Additional severe thunderstorms may develop along the cold front and the outflow boundary during the afternoon, heading southeastward into southeastern Iowa and much of Illinois by evening.
Tornadoes, high winds, hail, and heavy rainfall are all threats with the afternoon and evening thunderstorms. In addition, an isolated strong tornado is possible, with the highest threat area being along the outflow boundary, most likely in northern Illinois. Also, an intense cluster or line of severe thunderstorms may form, resulting in widespread damaging winds as the storms move southeastward through much of Illinois. The severe weather threat area might have to be adjusted for area and magnitude, depending on the effect that this morning's thunderstorms have on stabilizing and cooling the air where they pass, eventually resulting in the position of the outflow boundaries where additional severe thunderstorms are expected to develop later this afternoon.
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