Today will be mostly cloudy and more humid with occasional showers and thunderstorms likely. As the warm front moves toward southern Wisconsin, some thunderstorms may be severe, with hail, high winds, and heavy rainfall. High temperatures will be in the middle to upper 70s, but may range from the lower to middle 80 near the Illinois state line south of the warm front to the lower to middle 70s well north of Madison. Showers and thunderstorms will continue into this evening; some thunderstorms may be severe. A cold front will move through Wisconsin tonight, ending the chances for thunderstorms and severe weather.
Mostly cloudy skies early on Thursday will become partly sunny for the remainder of the day with pleasant high temperatures in the upper 70s. High pressure will return on Friday with mostly sunny skies and warmer weather. High temperatures will reach the lower to middle 80s.
Saturday will be partly sunny, breezy, very warm, and more humid ahead of an approaching storm system, with high temperatures in the upper 80s and heat index values in the lower to the middle 90s. While there will be a slight chance of a shower or thunderstorm on Saturday, showers and thunderstorms will become likely later Saturday night as the storm system enters Wisconsin. Sunday will be variably cloudy, breezy, very warm, and humid day with scattered showers and thunderstorms. High temperatures will again reach the upper 80s, with heat index values in the lower to the middle 90s.
After the passage of a cold front, Monday will be partly sunny and warm, but should turn less humid with high temperatures in the middle 80s. Tuesday will be partly sunny and cooler; high temperatures will be in the middle to the upper 70s.
TODAY:
Mostly cloudy and more humid with occasional showers and thunderstorms; some thunderstorms may be severe with high winds, hail, and heavy rainfall.
High: 77
Wind: S/SE 8-15 MPH
TONIGHT:
Mostly cloudy with showers and thunderstorms, mainly in the evening; a few thunderstorms may be severe early. Areas of fog possible overnight.
Low: 62
Wind: N 8-15 MPH
THURSDAY:
Mostly cloudy early, then becoming partly sunny.
High: 77
Wind: N/NE 8-15 MPH
THURSDAY NIGHT:
Mostly clear and a little cooler.
Low: 55
Wind: Light and Variable
FRIDAY:
Mostly sunny and warmer.
High: 84
Wind: S/SE 8-15 MPH
SATURDAY:
Partly sunny, breezy, very warm, and more humid with a slight chance of showers and thunderstorms (becoming mostly cloudy with showers and thunderstorms likely at night).
Low: 65
High: 88; Heat Index: 90 to 95
SUNDAY:
Variable cloudiness, very warm, and humid with scattered showers and thunderstorms.
Low: 71
High: 87; Heat Index: 90 to 95
MONDAY:
Partly sunny and warm, but less humid.
Low: 64
High: 84
TUESDAY:
Partly sunny and cooler.
Low: 56 High: 76
WEDNESDAY:
Mostly sunny and pleasant.
Low: 55 High: 77
NOTES:
A FLASH FLOOD WATCH is in effect until 10 AM Wednesday morning for eastern and parts of northeastern Iowa, and northwestern Illinois. In Iowa, this includes the counties of CLAYTON, DELAWARE, and DUBUQUE. In Illinois, this includes the counties of JO DAVIESS and STEPHENSON.
A FLASH FLOOD WATCH is in effect from 10 AM today until 1 AM early Thursday 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 of severe thunderstorms for today and tonight across much of the northeastern quarter of Illinois, and for far southwestern Wisconsin (south and west of a Prairie du Chien to Madison to Kenosha line). There is an ENHANCED RISK of severe thunderstorms for extreme southeastern Minnesota, the northeastern quarter of Iowa, the rest of the northeastern third of Illinois, and the rest of the southern quarter of Wisconsin (south of a La Crosse to Wisconsin Dells to Sheboygan line); a SLIGHT RISK of severe thunderstorms for the rest of southeastern Minnesota, the rest of the northeastern third of Iowa, the rest of the northeastern half of Illinois, and the rest of the southern third of Wisconsin (south of a Rochester, MN to Oshkosh to Manitowoc line), and a MARGINAL RISK of severe thunderstorms for the rest of the southeastern third of Minnesota, the rest of the northeastern two-thirds Iowa, the rest of Illinois, and rest of the southern half of Wisconsin (south of a Minneapolis, MN to Green Bay line). A significant severe weather outbreak is possible today over the central Midwest. Thunderstorms near and north of a warm front from Iowa into northern Illinois this morning may be severe, with hail, high winds, and heavy rainfall as the main threats. After these thunderstorms weaken and move into Lake Michigan and Indiana, clouds may clear and the warm front may move northward toward the Wisconsin/Illinois state line. Hot and humid air south of the warm front will be overrun by drier air from the southwest along a cold front advancing through Iowa into Illinois as low pressure moves through southern Wisconsin. Severe thunderstorms will rapidly develop in the afternoon near the warm and cold fronts, with hail, damaging winds, heavy rainfall, and tornadoes all possible. An isolated strong tornado and very large hail larger than 2 inches in diameter are possible from far eastern Iowa into northwestern Illinois and southwestern Wisconsin where severe thunderstorms form initially in the afternoon. Widespread wind damage is possible with the thunderstorms as they move through the rest of far southern Wisconsin into northern and northeastern Illinois ahead of the cold front by this evening. The severe weather threat will end with the passage of the cold front tonight.
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