Thunderstorms along a slow moving cold front produced damaging winds to portions of Fond du Lac and Sheboygan Counties.
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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 MKX wrote it up.
Thunderstorms along a slow moving cold front produced damaging winds to portions of Fond du Lac and Sheboygan Counties.
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 Milwaukee, WI wrote its last area forecast discussion before the first event at Aug 3, 2:25 PM CST, 3 hours 20 minutes earlier.
Area Forecast Discussion National Weather Service Milwaukee/Sullivan WI 325 PM CDT Thu Aug 3 2023 .SHORT TERM... (Issued 325 PM CDT Thu Aug 3 2023) Tonight through Friday Night: The potential for pop-up showers and thunderstorms remains in the forecast this afternoon and evening, with the highest chances north of the I-94 corridor in the evening hours. The RAP and HRRR continue to show shallow moisture advection and convergence along an east-west oriented boundary approaching our region from the north. We have seen some weak shower activity on this boundary over Wood and Adams county, but nothing long-lived. About 25kts of 0-6km shear is present, so mostly short- lived pop- up storms are expected. Showers and storms should be isolated to scattered. A few stronger thunderstorms with some gusty winds are possible. The cold front associated with the low over James Bay Canada will sweep southward across our region overnight into Friday morning. Wind direction turns east as a high builds into the GL region from the north. Dry weather and fewer clouds expected tomorrow. Sheppard && .LONG TERM... (Issued 325 PM CDT Thu Aug 3 2023) Saturday and Sunday: High pressure will sink southward over the Great Lakes on Saturday bringing east winds to southern Wisconsin. Showers and thunderstorms are likely Saturday night and Sunday. A deep shortwave moves through the region on Sunday with a surge of deep moisture. There continues to be uncertainty with the track of the surface low which would affect our severe weather potential. Some models track across central Wisconsin putting our area in the warm sector with greater instability while others track it across the WI/IL state line with minimal instabililty. So there is the potential for some strong storms over 1000+ J with 20 to 30 knots of shear. There is lack of an organized jet, both upper and lower, so forcing would be at the mid levels with the shortwave. PWs values are 1.5 to 2 inches, depending on the model, indicating a good chance for some heavy downpours. Monday through Thursday: The upper level trough will dominate for much of the week. Another shortwave looks to move through midweek bringing another chance for rain. Marquadt && .AVIATION... (Issued 325 PM CDT Thu Aug 3 2023) A few thunderstorms are possible later this afternoon and evening mainly north and east of Madison and including MKE. Lower cloud bases and gusty winds are expected under any of these showers and storms. Otherwise VFR conditions are expected through Friday. Light southwest winds will become northeast tonight but will remain weak. Southwest Wisconsin could see fog again tonight into Friday morning but confidence in that occuring is low. Marquadt && .MARINE... (Issued 325 PM CDT Thu Aug 3 2023) Modest south to southwesterly winds will continue today ahead of an approaching cold front extending from a low pressure up in the James Bay region. Expect the weak cold front to slide from north to south across Lake Michigan this evening and stall south of the Lake on Friday. Behind the front expect north to northeasterly winds to pick up through the day Friday. Waves will rise in response to this, which might necessitate a small craft advisory sometime in the Friday evening to Saturday morning timeframe. For the time being, waves are expected to max out at around 3ft in the nearshore, and 4ft in the open waters. Winds will weaken and waves will subside into Saturday as high pressure builds southward into the Great Lakes Region. We continue to see signs of a stronger area of low pressure to develop over the Plains, then track across Lake Michigan from Sunday into Monday. While the exact track, strength, and location remains uncertain at this time, we expect the potential for enhanced winds and thunderstorm chances with this system. Sheppard && .MKX WATCHES/WARNINGS/ADVISORIES... WI...None. LM...None. && Visit us at weather.gov/milwaukee Follow us on Facebook, Twitter, and YouTube at: www.facebook.com/NWSMilwaukee www.twitter.com/NWSMilwaukee www.youtube.com/NWSMilwaukee
Hazardous Weather Outlook National Weather Service Milwaukee/Sullivan WI 233 PM CDT Thu Aug 3 2023 WIZ046-047-051-052-056>060-062>072-041945- Marquette-Green Lake-Fond du Lac-Sheboygan-Sauk-Columbia-Dodge- Washington-Ozaukee-Iowa-Dane-Jefferson-Waukesha-Milwaukee- Lafayette-Green-Rock-Walworth-Racine-Kenosha- 233 PM CDT Thu Aug 3 2023 This Hazardous Weather Outlook is for portions of east central Wisconsin, south central Wisconsin and southeast Wisconsin. .DAY ONE...Tonight Chance of thunderstorms for later this afternoon and evening, mainly for areas north of the I-94 corridor. .DAYS TWO THROUGH SEVEN...Friday through Thursday Thunderstorm chances return Saturday and Sunday. A moderate swim risk is possible for Friday night, and potentially at times through this weekend. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed. LMZ643>646-041945- Sheboygan to Port Washington WI- Port Washington to North Point Light WI- North Point Light to Wind Point WI- Wind Point WI to Winthrop Harbor IL- 233 PM CDT Thu Aug 3 2023 This Hazardous Weather Outlook is for the nearshore waters from Sheboygan Wisconsin to Winthrop Harbor Illinois. .DAY ONE...Tonight Chance of thunderstorms later this afternoon and evening, mainly north of the Port of Milwaukee. .DAYS TWO THROUGH SEVEN...Friday through Thursday Thunderstorm chances return Saturday and Sunday. Small craft conditions possible at times this weekend into early next week. LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868- 870-872-874-876-878-041945- Lake Michigan Michigan City IN to St. Joseph MI 5 NM offshore to mid-line of lake.- Lake Michigan from Seul Choix Point to Rock Island Passage 5NM offshore to Mid Lake- Lake Michigan South of a line from Seul Choix Point to the Mackinac Bridge and North of a line from Charlevoix MI to South Fox Island 5NM offshore- Lake Michigan from Charlevoix to Point Betsie MI 5NM Offshore to mid lake- Lake Michigan from Point Betsie to Manistee MI 5NM offshore to Mid Lake- Lake Michigan from Rock Island Passage to Sturgeon Bay WI 5NM offshore to mid lake- Lake Michigan from Sturgeon Bay to Two Rivers WI 5NM offshore to Mid Lake- Lake Michigan from Two Rivers to Sheboygan WI 5NM offshore to Mid Lake- Lake Michigan from Sheboygan to Port Washington WI 5NM offshore to Mid Lake- Lake Michigan from Port Washington to North Point Light WI 5NM offshore to Mid Lake- Lake Michigan from North Point Light to Wind Point WI 5NM offshore to Mid Lake- Lake Michigan from Wind Point WI to Winthrop Harbor IL 5NM offshore to Mid Lake- Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5NM offshore to Mid Lake- Lake Michigan from Wilmette Harbor to Michigan City in 5NM offshore to Mid Lake- Lake Michigan from Pentwater to Manistee MI 5NM offshore to Mid Lake- Lake Michigan from Whitehall to Pentwater MI 5NM offshore to Mid Lake- Lake Michigan from Grand Haven to Whitehall MI 5NM offshore to Mid Lake- Lake Michigan from Holland to Grand Haven MI 5NM offshore to Mid Lake- Lake Michigan from South Haven to Holland MI 5NM offshore to Mid lake- Lake Michigan from St Joseph to South Haven MI 5NM offshore to Mid Lake- 233 PM CDT Thu Aug 3 2023 This Hazardous Weather Outlook is for the open waters of Lake Michigan. .DAY ONE...Tonight Chance of thunderstorms this afternoon and evening for northern two-thirds of the open waters. .DAYS TWO THROUGH SEVEN...Friday through Thursday Thunderstorm chances return Saturday and Sunday. www.weather.gov/mkx
The Green Bay radar (KGRB), 74 km away, was scanning. The volume nearest the first event began at 23:43 UTC.
4 thunderstorm wind. Local standard time, as filed.
Numerous trees down.
Three trees down and power lines down.
Three-inch tree limbs down.
Tree branches down. Power outages reported.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wisconsin in 2023Every state in 2023This day in weather historyWarnings in Wisconsin, August 2023
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: 1124951, 1124953, 1124952, 1124954.