A strong thunderstorm developed ahead of an approaching cold front during the overnight hours late Tuesday (9/20) into early Wednesday (9/21). The storm produced large hail up to golf ball size as it traveled across central Wisconsin.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS GRB wrote it up.
A strong thunderstorm developed ahead of an approaching cold front during the overnight hours late Tuesday (9/20) into early Wednesday (9/21). The storm produced large hail up to golf ball size as it traveled across central Wisconsin.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Green Bay, WI wrote its last area forecast discussion before the first event at Sep 20, 9:56 PM CST, 1 hour 18 minutes earlier.
Area Forecast Discussion National Weather Service Green Bay WI 1056 PM CDT Tue Sep 20 2022 Updated aviation portion for 06Z TAF issuance .SHORT TERM...Tonight and Wednesday Issued at 305 PM CDT Tue Sep 20 2022 The atmosphere was relatively stable across the region this afternoon after the convection from this morning exited the area. The models continue to offer differing solutions as to the amount of convection that forms ahead of the cold front approaching from northern Minnesota. Moderate shear, and inverted V sounding, and low wet bulb zero heights could support isolated severe storms with large hail and strong winds if they do materialize. Lows tonight will remain a few degrees above normal. The front will exit the area tomorrow morning, with cooler and less humid air arriving during the day. The much cooler air from Canada will be slow to arrive, so high temperatures will still be a few degrees above normal. There could be a few sprinkles in the afternoon in Vilas county. .LONG TERM...Wednesday Night Through Tuesday Issued at 305 PM CDT Tue Sep 20 2022 Models indicate a progressive flow across the northern tier of states as a pair of strong shortwave troughs to impact the Great Lakes region. The first trough to already be impacting northeast WI at the start of the period and help to usher a taste of Autumn. The second trough arrives this weekend with additional precipitation chances. Temperatures to be at or below normal through the extended period. Wednesday night and Thursday... Cyclonic flow to exist over the western Great Lakes region Wednesday night as the strong mid-level shortwave trough shifts toward the eastern Great Lakes. CAA continues through the night and as 8H temperatures drop to between -2 to -4C over western Lake Superior, expect to see lake effect clouds and a chance for lake effect showers to develop. Delta-T values reach the upper teens, thus have continued the chance pop for north-central WI. Otherwise, mostly clear to partly cloudy skies are forecast for the rest of northeast WI Wednesday night with min temperatures around 40 degrees north, lower to middle 40s south and upper 40s near Lake MI. A few showers or sprinkles are possible into Thursday morning, however as an area of high pressure builds into WI from the Upper MS Valley, anticipate dry conditions for most locations with increasing sunshine. Somewhat blustery conditions expected Thursday morning, especially over eastern WI but winds should start to relax in the afternoon with the approach of the high pressure. Cooler conditions to prevail (definitely more fall-like) as max temperatures only reach the middle 50s far north, around 60 degrees south. Thursday night and Friday... The high pressure will move east and reside over the Great Lakes Thursday night. Models show a very dry air mass overhead and with expected light winds and a cool air mass aloft, it appears that the first frost/freeze headlines will be needed over northern and parts of central WI. Min temperatures to range from the upper 20s to around 30 degrees north, to the lower 40s near Lake MI. As the high pressure shifts east on Friday, a return flow develops over WI. Meanwhile, the next mid-level shortwave trough is forecast to sweep into the northern Plains. Look for clouds to be on the increase Friday afternoon with the leading edge of showers to approach central WI late in the day. Max temperatures to mainly be in the 60-65 degree range. Friday night and Saturday... Rain chances to overspread the rest of northeast WI Friday night as the shortwave trough reaches the western Great Lakes. These rain chances should continue into Saturday, but to a less extent as a weak cold front pushes through the area. Max temperatures on Saturday to be in the lower to middle 60s north, middle to upper 60s south. Saturday night and Sunday... Additional shortwave energy is forecast to dig into the shortwave trough Saturday night with sufficient mid-level forcing to bring another chance of showers to all of northeast WI. Even though this shortwave energy departs on Sunday, we still have a cyclonic flow over WI and with daytime heating, cannot rule out additional showers chances along with a slight chance of thunderstorms. Max temperatures on Tuesday to range from the upper 50s to around 60 degrees north, mainly middle 60s south. Sunday night and Monday... Precipitation chances should gradually diminish Sunday night as the cyclonic flow weakens and we lose the daytime heating. For the most part, Monday is looking dry over most of the forecast area. However, a northwest flow into the region could bring a stray shower or two to northern WI as more shortwaves move southeast into the mean trough located over the northeast CONUS. Under mainly partly sunny skies, max temperatures on Monday to be in the upper 50s to lower 60s. Monday night and Tuesday... High pressure to then move into the Great Lakes for Monday night into Tuesday, providing for dry conditions and a slight bump up in temperatures. Look for readings to be in the upper 50s to lower 60s. && .AVIATION...for 06Z TAF Issuance Issued at 1056 PM CDT Tue Sep 20 2022 Scattered showers and thunderstorms ahead of an approaching cold front are expected to sweep through the area during the overnight hours. The models that currently have a handle on the activity sweep it through central and north-central Wisconsin around midnight, then across east-central Wisconsin during the very early morning hours on Wednesday. Although the models do weaken the storms below severe levels, they do hold most of the activity together; therefore, will track the showers and thunderstorms through the area per the CAMs models that currently have a good handle on the current activity. The convection could lower conditions to MVFR/IFR at times as it passes through the area. The cold front will exit eastern Wisconsin by daybreak Wednesday, with VFR ceilings and northwest surface winds gusting to 25 knots during the daytime hours. && .GRB WATCHES/WARNINGS/ADVISORIES... None. && SHORT TERM.....RDM LONG TERM......Kallas AVIATION.......Kurimski
Hazardous Weather Outlook National Weather Service Green Bay WI 851 AM CDT Tue Sep 20 2022 WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-211400- Vilas-Oneida-Forest-Florence-Northern Marinette County-Lincoln- Langlade-Menominee-Northern Oconto County-Door-Marathon-Shawano- Wood-Portage-Waupaca-Outagamie-Brown-Kewaunee-Waushara-Winnebago- Calumet-Manitowoc-Southern Marinette County- Southern Oconto County- 851 AM CDT Tue Sep 20 2022 This Hazardous Weather Outlook is for north-central and northeast Wisconsin. .DAY ONE...This Afternoon and Tonight Thunderstorms are possible tonight as a cold front moves across Wisconsin. There is a slight risk of severe thunderstorms with large hail and damaging winds in north central Wisconsin this evening, with a decreasing threat of severe weather as the storms move south and east. .DAYS TWO THROUGH SEVEN...Wednesday through Monday Frost is possible across north-central Wisconsin Friday morning. .SPOTTER INFORMATION STATEMENT... Spotter activation could be needed in north central Wisconsin this evening. LMZ521-522-541>543-211400- The Bay of Green Bay south of a line from Cedar River MI to Rock Island Passage-Lake Michigan from Washington Island to Sheboygan- 851 AM CDT Tue Sep 20 2022 This Hazardous Weather Outlook is for portions of northwest Lake Michigan and the waters of Green Bay. .DAY ONE...This Afternoon and Tonight There is a chance of thunderstorms after midnight tonight. Widespread severe weather is not anticipated, though the stronger storms could produce hail and gusty winds. .DAYS TWO THROUGH SEVEN...Wednesday through Monday Conditions hazardous to small craft are possible Wednesday into Thursday due to gusty northwest winds. RDM
Special Weather Statement
National Weather Service Green Bay WI
1102 PM CDT Tue Sep 20 2022
WIZ030-035-210500-
Wood WI-Marathon WI-
1102 PM CDT Tue Sep 20 2022
...Strong thunderstorms will impact portions of Wood and southwestern
Marathon Counties through MIDNIGHT CDT...
At 1101 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Loyal to near Black River Falls. Movement
was east at 45 mph.
HAZARD...Winds in excess of 30 mph and penny size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
Strong thunderstorms will be near...
Spencer around 1110 PM CDT.
Marshfield around 1115 PM CDT.
Other locations in the path of these storms include Babcock.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with these storms and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 4485 9032 4485 8967 4468 8968 4468 8985
4451 8984 4451 8973 4425 8972 4425 9032
TIME...MOT...LOC 0401Z 277DEG 40KT 4473 9043 4433 9076
MAX HAIL SIZE...0.75 IN
MAX WIND GUST...30 MPH
KurimskiSpecial Weather Statement
National Weather Service Green Bay WI
1139 PM CDT Tue Sep 20 2022
WIZ030-035-036-210545-
Wood WI-Marathon WI-Portage WI-
1139 PM CDT Tue Sep 20 2022
...Strong thunderstorms will impact portions of Wood, Portage and
southern Marathon Counties through 1245 AM CDT...
At 1139 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 10 miles west of Mosinee to 12 miles northeast
of Millston. Movement was east at 40 mph.
HAZARD...Winds in excess of 30 mph and penny size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
Strong thunderstorms will be near...
Mosinee around 1155 PM CDT.
Other locations in the path of these storms include Babcock and
Bevent.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with these storms and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 4467 9032 4485 9019 4487 8922 4481 8922
4425 8934 4424 8955 4425 9032
TIME...MOT...LOC 0439Z 275DEG 36KT 4474 8990 4427 9041
MAX HAIL SIZE...0.75 IN
MAX WIND GUST...30 MPH
KurimskiThe La Crosse radar (KARX), 110 km away, was scanning. The volume nearest the first event began at 05:15 UTC.
4 hail. Local standard time, as filed.
Ping pong size hail fell near Nekoosa. The time of this report is an estimate based on radar data.
Half dollar size hail fell near Pine River. The time of this report is an estimate based on radar data.
Hail up to 1 and 7/8 inch in diameter fell near Poy Sippi. The time of this report is an estimate based on radar data.
Half dollar size hail fell near Poy Sippi. The time of this report is an estimate based on radar data.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wisconsin in 2022Every state in 2022This day in weather historyWarnings in Wisconsin, September 2022
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 1048912, 1048917, 1048913, 1048915.