As a powerful early season storm system moves through the area this evening, showers and thunderstorms will be crossing southern Wisconsin. Some of these could be severe with large hail and strong winds being the main threat.
Showers and thunderstorms will continue overnight, but the severe threat will end with the passage of the cold front. It will remain breezy with lows in the lower 40s.
As the storm system moves away from Wisconsin on Wednesday, it will be mostly cloudy and very windy with scattered showers. High temperatures will be around 50. Winds may gust as high as 50 MPH at times. Wednesday night will become colder with scattered rain showers, possibly mixing with snow north of Madison. Winds will remain strong in the evening, and temperatures will fall into the middle 30s.
Cooler air will continue to slide across the region Thursday through the weekend. Thursday will be mostly cloudy, breezy, and colder with isolated rain showers, possibly mixing with snow early Thursday morning, and again Thursday night before ending. Highs will reach the lower 40s. Friday will be variably cloudy and seasonably cool with high temperatures in the lower 40s.
For the weekend, a weak weather system will move through the Midwest on Saturday, with variably cloudy skies and a slight chance for some drizzle or flurries. High temperatures will be near 40 degrees. Skies will be partly sunny on Sunday with highs remaining near 40.
Warmer air will return next week as another strong storm system develops to our west. Monday will be partly sunny and seasonably cool with highs in the middle 40s. Tuesday will be increasingly cloudy and milder with a chance of showers late in the day or at night. Highs will be near 50.
A HIGH WIND WARNING has been issued for Grant county from 4 AM until 8 PM Wednesday.
A HIGH WIND WATCH has been issued for Iowa, Dane, Jefferson, Lafayette, Green, Rock, and Walworth counties from 7 AM until 8 PM Wednesday.
A WIND ADVISORY has been issued for Crawford, Richland, and Vernon counties from 4 AM until 8 PM Wednesday.
A WIND ADVISORY has been issued for Sauk, Columbia, Marquette, Green Lake, and Dodge counties from 9 AM to 10 PM Wednesday.
TONIGHT:
Mostly cloudy and breezy with scattered showers and thunderstorms; some may be severe with large hail and strong winds
Low: 43
Wind: SE to SW 10-20 MPH
WEDNESDAY:
Mostly cloudy and very windy with scattered showers
High: 49
Wind: W 20-35 MPH (gusts to 50 MPH)
WEDNESDAY NIGHT:
Mostly cloudy, windy, and colder with scattered rain showers, possibly mixing with snow north of Madison
Low: 36
Wind: NW 15-25 MPH (plus higher gusts in the evening)
THURSDAY:
Mostly cloudy, breezy, and colder with isolated rain showers, possibly mixing with snow early in the morning and again late at night
High: 43
Wind: NW 10-20 MPH
FRIDAY:
Variable cloudiness and seasonably cold
Low: 32
High: 41
SATURDAY:
Variable cloudiness and chilly with a slight chance of drizzle or flurries
Low: 28
High: 41
SUNDAY:
Partly sunny and seasonably cold
Low: 26
High: 40
MONDAY:
Partly sunny and seasonably cool
Low: 25
High: 45
TUESDAY:
Increasing cloudiness with a chance of showers late in the day or at night
Low: 31
High: 49
NOTES:
The Storm Prediction Center says there is a SLIGHT RISK of severe thunderstorms tonight for northern and central Illinois, eastern Iowa, as well as far southern Wisconsin (south of a line from Prairie du Chien to Madison to West Bend), and a MARGINAL RISK of severe thunderstorms for the eastern third of Iowa, the rest of Illinois, and the southern third of Wisconsin (south of a La Crosse to Sheboygan line). Mild and somewhat humid air is in place across the central Midwest, and a cold front will sweep eastward through Wisconsin and Illinois this evening. Thunderstorms are expected along and ahead of the cold front, and there is the potential for a few severe thunderstorms to develop. Strong wind fields above the cold front and colder air aloft may result in the severe thunderstorms producing high winds and hail. Isolated tornadoes cannot be ruled out as well, but higher wind shear indicates that the tornado threat will be highest in the slight risk area farther to the south into eastern Illinois. The severe weather threat will end with passage of the cold front tonight.
A HIGH WIND WARNING has been issued for Grant county from 4 AM until 8 PM Wednesday.
A HIGH WIND WATCH has been issued for Iowa, Dane, Jefferson, Lafayette, Green, Rock, and Walworth counties from 7 AM until 8 PM Wednesday.
A WIND ADVISORY has been issued for Crawford, Richland, and Vernon counties from 4 AM until 8 PM Wednesday.
A WIND ADVISORY has been issued for Sauk, Columbia, Marquette, Green Lake, and Dodge counties from 9 AM to 10 PM Wednesday.
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