Late evening update: Severe threat has ended for the night
Updated: Saturday, April 27th 11:50pm:
Showers and storms are exiting SE WI and have weakened below severe limits. The Severe Thunderstorm Watch will expire at midnight.
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Updated: Saturday, April 27th 8:30pm:
Scattered strong to severe storms continue to develop and track across southern Wisconsin this evening. Most of the severe warnings that are in place are for quarter sized hail.
Additional storms are making their way across eastern Iowa at the moment and will help fill in the rain by later this evening.
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Updated: Saturday, April 27th 6:50pm:
A Severe Thunderstorm Watch has been issued for all of southeast Wisconsin until midnight.
Outside of dime to penny sized hail, storms have been behaving themselves to far in southeast Wisconsin, but storms closer to the front in southwest Wisconsin have been severe. The tornado warned storm north of Monroe has also produced a funnel cloud.
Strong to severe storms become more numerous throughout the evening with damaging winds, hail, and an isolated tornado being the concerns.
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Updated: Saturday, April 27th 5:40pm:
Scattered thunderstorms have been developing over the last couple of hours with a few starting to be strong to severe. More storms will likely become strong to severe this evening as the cold front moves closer and gives storms an extra push.
Storms have been producing dime, nickel, and quarter sized hail so far this evening. Damaging winds and hail will continue to be the concerns through the rest of the evening.
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It's been a warm, windy, and a tad humid day today in southeast Wisconsin, meaning there's plenty of fuel out there for thunderstorms.
While we're dry with partly cloudy skies as of mid afternoon, there is a subtle boundary draped from Sheboygan through SW WI which will act as a trigger for thunderstorms this evening. A lone storm has popped ahead of this boundary in NW IL, tracking to the northeast.
Scattered thunderstorms look to develop along this boundary after 6pm and will impact southeast Wisconsin throughout the evening.
Storms that form will likely be strong to severe with damaging wind, hail, and an isolated tornado all possible. Southeast Wisconsin remains under a level 2 of 5, Slight Risk, for severe storms today.
The severe threat wains after 1am, but the threat will transition from a severe threat to a flooding threat overnight into Sunday. Storms, severe or not, will be efficient rain producers and may track over the same areas - increasing the flooding threat.
Rounds of rain and storms will continue throughout Sunday with the steadiest rain during the morning hours. We'll have to keep an eye on far southern WI for a strong storm or two later in the day.
A cold front that moves through tonight will be competing with a warm front approaching from the south on Sunday. Locations near the IL border may warm well into the 60s, while locations from Milwaukee northward will likely spend most of the day in the 40s.
Rain and storms continue Sunday night into early Monday with a few more isolated showers possible during the day. From tonight through Monday, southeast WI may see anywhere from .75-2" of rain. Highest totals will be in spots that see repeated storms.
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