Record high lake levels on Lake Michigan caused some isolated flooded areas near the lake on an ongoing basis.
Every event with a place to put it. Tap one for its entry below.
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.
Record high lake levels on Lake Michigan caused some isolated flooded areas near the lake on an ongoing basis.
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 Jul 31, 9:47 PM CST, 2 hours 13 minutes earlier.
Area Forecast Discussion National Weather Service Green Bay WI 1047 PM CDT Fri Jul 31 2020 Updated aviation portion for 06Z TAF issuance .SHORT TERM...Tonight and Saturday Issued at 243 PM CDT Fri Jul 31 2020 Partly cloudy skies prevailed across the region this afternoon as temperatures warmed into the 70s. For tonight, the fair weather cumulus will dissipate around sunset. The combination of clear skies and light winds will allow for some fog to develop late tonight. Lowered minimum temperatures a few degrees, especially across the north and at our typical colder spots. Low temperatures will from the upper 40s to lower 50s north, and in the middle to upper 50s south. Any patchy fog should burn off shortly on sunrise on Saturday. Fair weather cumulus clouds will develop by late morning and continue through the afternoon. There is a chance of showers and thunderstorms across far north-central Wisconsin late Saturday afternoon. Severe storms are not expected. High temperatures will be in the upper 70s to middle 80s. .LONG TERM...Saturday Night Through Friday Issued at 243 PM CDT Fri Jul 31 2020 The main forecast concern in the extended forecast will be the potential for showers and few thunderstorms Saturday night into Sunday. In addition, a trend toward below normal temperatures is expected for the first half of next week. Saturday night and Sunday: An upper-level trough is expected to shift across the northern Plains into the western Great Lakes through this time period. At the surface, a surface trough/cold front will stretch from James Bay southwest to western Iowa Saturday night. That trough/front is expected to shift slowly southeastward, reaching southern WI late Sunday afternoon. Farther southeast, a surface low is expected to develop over the Ohio Valley and lift northeastward into southern Ontario. The main impacts across northeast WI will be ahead of the trough/front. Increasing moisture and forcing along the front will help to touch off showers and a few thunderstorms, beginning early Saturday evening across central and north-central WI then spreading slowly through the rest of the area late Saturday night into Sunday. Instability is expected to be fairly low with the system moving into the area after peak heating, but there will still be enough to see a few rumbles of thunder early in the evening. As the front sinks southward Sunday afternoon showers and thunderstorms will likely increase in coverage once again. Severe weather is not expected with instability values running low and little to no shear around. Overall rainfall is not expected to be overly impressive and will likely be more scattered across much of the area. Monday through Thursday: Upper-level troughing is expected to remain in place across the area through much of this time period. At the surface, a dry high pressure system is expected to build across the area and become centered directly overhead by Tuesday night into Wednesday. The troughing pattern will help to keep temperatures below normal with most locations running in the upper 60s to low 70s for high temperatures. Overnight lows will likely cool into the 40s north and 50s south. Rest of the extended: As the aforementioned surface ridge shifts eastward, return flow will lift northward ahead of the next cold front approaching the area from the Plains. Shower and thunderstorm potential will likely increase next Friday as the system passes through the area. At this point went with a blend of the models for timing/coverage, which gives a chances of showers and storms for that time period. Temperatures are expected to warm to near normal. && .AVIATION...for 06Z TAF Issuance Issued at 1047 PM CDT Fri Jul 31 2020 Good flying conditions to continue through Saturday with high pressure in control of northeast WI weather. Clear skies and light winds overnight may lead to patchy ground fog toward daybreak. Vsbys may drop into the MVFR category, but quickly dissipate early Saturday morning. Expect diurnal cu field to develop once again by mid to late morning and again be in that 4,500 to 6000 ft range through the afternoon. Winds across central WI to become southwest at 5 to 10 knots on Saturday as the high pressure begins to shift east. Eastern WI to see northeast winds at 5 to 10 knots in the morning, shift to the east-southeast in the afternoon. Shower chances will be on the increase across north-central WI Saturday evening as a cold front approaches the area. Cigs may drop to MVFR under any of these showers. && .GRB WATCHES/WARNINGS/ADVISORIES... NONE. && SHORT TERM.....Eckberg LONG TERM......Cooley AVIATION.......Kallas
Hazardous Weather Outlook National Weather Service Green Bay WI 245 PM CDT Fri Jul 31 2020 WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-011945- 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- 245 PM CDT Fri Jul 31 2020 This Hazardous Weather Outlook is for north-central and northeast Wisconsin. .DAY ONE...Tonight Fog may restrict visibilities for motorist late tonight into early Saturday morning. .DAYS TWO THROUGH SEVEN...Saturday through Friday Thunderstorms are possible over north-central Wisconsin late Saturday afternoon into Saturday night, and across the entire area on Sunday. The storms are not expected to be severe. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed tonight. LMZ521-522-541>543-011945- The Bay of Green Bay south of a line from Cedar River MI to Rock Island Passage-Lake Michigan from Washington Island to Sheboygan- 245 PM CDT Fri Jul 31 2020 This Hazardous Weather Outlook is for portions of northwest Lake Michigan and the waters of Green Bay. .DAY ONE...Tonight No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Saturday through Friday Thunderstorms are possible on Sunday. Northeast winds may gust as high as 25 knots Sunday afternoon through Monday, which may pose a hazard to mariners. Eckberg/Cooley
The national radar mosaic for the moment the first event began.
2 flood. Local standard time, as filed.
Areas around the Kewaunee Marina were often under water due to record high lake levels.
North Bayshore Road and County Highway Y from Harbor Road to County Highway A are closed due to ongoing flooding from record high lake levels.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wisconsin in 2020Every state in 2020This day in weather historyWarnings in Wisconsin, August 2020
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: 902553, 902558.