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JUL 17, 2020 | Severe Storms in Northern Wisconsin

LAST UPDATE : JUL 18, 2020

FRI 2:00PM - A severe line/complex of storms will push into northwest Wisconsin after midnight tonight. Damaging winds (perhaps significant) will be the main threat. The highest threat for severe weather will be in Minnesota. Gradual weakening of this complex is likely across northern Wisconsin as convective instability declines...however a strong to severe storm will be possible all the way into central Upper Michigan and northeast Wisconsin.

Wisconsin Weather

The Storm Prediction Center has placed far NW Wisconsin under a moderate risk for severe weather tonight.

Forecast Maps

Thunderstorm Outlooks

Thunderstorms
General
Strong
Severe
Significant

Verification


Storm Details

Hazards
Severe T-Storms, Heavy Rain
Start
FRI 1:00 PM - Jul 17, 2020
End
SAT 8:00 AM - Jul 18, 2020
Confidence Level
Storm Class

Posts

Fewer warnings than before across the state. Keeping a close eye on it yet....not over. Based on reports it could be worse. Think we'll be alright. Strong to severe storms could make it all the way to Lake Michigan...specifically those in central WI which are also trying to get into southern WI.
Cells losing some organization on latest scans. Looked primed to roll not long ago. Told you this event would be hard to pin down. The night is young. I'm taking a break rn, will check back in a couple hours. I will head out locally around 3am if needed...not too far. Just enough to get in on some of the action.
Interesting to watch these three cells. Not warned currently. Heavy rain primarily. Southernmost cell is a right mover that could dive into central WI. Instability gradient in play.
Dealing with supercells west of Eau Claire atm and TOR WARNING near River Falls is legit. I believe this activity will continue eastward along the instability gradient. Busy night? Eyes on
SEVERE TSTORM WATCH for northern WI tonight. Scattered strong tstorms are developing in northwest WI heading east overnight. A few cells could move into central or southern WI. Severe weather possible including damaging winds, hail, and isolated tornadoes.
CAPE gradient NW to SE through WI. Keep an eye on that tonight.
Large supercell set to track near & north of Eau Claire this evening...we'll call it "Big Boy". TOR WARNINGS earlier but weak rotation, since reduced to SVR TSTORM. What about additional development? Strange than were not seeing more cells popping. Suggests Big Boy will be the focal point tonight.
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T-storms expected to develop in the region along the Mississippi River north of Minneapolis late this afternoon. They will push east this evening into the overnight hours. Severe weather is possible. Setting the stage with this update. Will keep you posted!
Overnight storms heading out to sea soon in NE WI. Damaging wind gusts the main threat for Marinette, Door County. Watching the cluster west of La Crosse...not certain it will hold together as it heads east but it looks solid still.
Complex of storms with history of severe weather including damaging wind gusts exceeding 60MPH will enter NW WI within the next few hours. Some weakening as the complex moves through NE WI/UPPER MI early SAT AM.
Wind shear of 20-35kts not strong enough to balance out the 8,000 SBCAPE. Out-of-control outflow on the southern fringe in NODAK. Segment advancing through MN will probably intensify this evening...main event. Heading into NW WI overnight.

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July 17, 2020

24HR Radar Loop
24HR Radar Loop
Wind Gusts
Storm Reports

July 18, 2020

24HR Radar Loop
24HR Radar Loop
Wind Gusts
Storm Reports

Storm Reports

WIND GUSTS (23)
TSTM WND GST
TSTM WND GST
1 W SANBORN, WI
63 MPH
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TSTM WND GST
2 NNE FRENCH ISLAND, WI
58 MPH
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3 WNW CLAM LAKE, WI
55 MPH
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WASHINGTON ISLAND, WI
53 MPH
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STODDARD 5NNE, WI
45 MPH
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TSTM WND GST
1 SW BUTLER, WI
40 MPH
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1 N SANBORN, WI
-
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TSTM WND DMG
2 N BLUEBERRY, WI
-
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2 NE GRANTSBURG, WI
-
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4 SE WEBB LAKE, WI
-
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5 N WAUWATOSA, WI
-
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BLUEBERRY, WI
-
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3 E MOSINEE, WI
-
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3 ENE LITTLE ROUND LAKE, WI
-
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3 SSW TREGO, WI
-
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FIFIELD, WI
-
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HARSHAW, WI
-
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SUGAR CAMP, WI
-
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MOUNTAIN, WI
-
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OCONTO, WI
-
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WAUSAU, WI
-
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WESTON, WI
-
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THREE LAKES, WI
-
HEAVY RAIN (5)
HEAVY RAIN
HEAVY RAIN
SUPERIOR, WI
2.5"
HEAVY RAIN
HEAVY RAIN
IRON RIVER, WI
2.5"
HEAVY RAIN
HEAVY RAIN
2 W SUPERIOR, WI
1.7"
HEAVY RAIN
HEAVY RAIN
DELTA, WI
1.47"
HEAVY RAIN
HEAVY RAIN
1 W WASHBURN, WI
1.15"
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