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 Apr 30, 9:55 PM CST, 2 hours 5 minutes earlier.
Area Forecast Discussion National Weather Service Green Bay WI 1055 PM CDT Thu Apr 30 2020 Updated aviation portion for 06Z TAF issuance .SHORT TERM...Tonight and Friday Issued at 304 PM CDT Thu Apr 30 2020 Winds should slacken off quickly this evening as surface ridge of high pressure moves into Wisconsin. With clear skies and dry air, temperatures should fall a few degrees below normal in most places. Friday should start out sunny, with increasing middle and high clouds in the afternoon ahead of a warm front approaching from Minnesota. There is a chance of showers in the western portion of the forecast area towards evening but most of the region should remain dry through dusk. .LONG TERM...Friday Night Through Thursday Issued at 304 PM CDT Thu Apr 30 2020 The main highlights in the forecast period will be the light precipitation Friday night, the temperature swing from well above normal at the start of the weekend to normal next week, and the potential for another more significant system to impact the region by Tuesday/Wednesday. Friday night through the weekend... Strong WAA will be ongoing ahead of a shortwave set to arrive in the forecast area Friday night. The exact timing is still uncertain as guidance has some disagreement on the speed of the shortwave, but showers will likely come to an end by Saturday afternoon. High pressure over southern CONUS will block off the majority of the Gulf moisture during this time, so the showers are expected to be light. Warm and relatively dry air will fill in behind the system, keeping highs in the upper 60s and lower 70s Saturday through Sunday. Rest of the extended...Northwesterly flow aloft will begin Monday and slowly amplify through the rest of the extended, steadily bringing in cooler air. High temperatures will gradually return closer to the seasonal normals in the 50s during this time. A weak shortwave may bring some light showers again on Monday, but the majority of the rain will hold off until a more vigorous mid level disturbance moves through the region. There are still a lot of details to be filled in with this potential system, as the GFS has trended southwards, only grazing northeast Wisconsin as the bulk of the frontogenesis shifts towards the Illinois border. && .AVIATION...for 06Z TAF Issuance Issued at 1054 PM CDT Thu Apr 30 2020 Clear skies and excellent visibility is expected through tonight as high pressure builds across the region. Skies will start out clear Friday morning, but clouds will increase during the afternoon. A weak frontal system will bring the chance for showers and MVFR conditions late Friday afternoon into Friday night. The best chance for showers will be across north-central and portions of central Wisconsin, therefore placed a PROB30 group in the KAUW/KCWA/KRHI TAFs for this possibility. && .GRB WATCHES/WARNINGS/ADVISORIES... NONE. && SHORT TERM.....RDM LONG TERM......Uhlmann AVIATION.......Kurimski
Hazardous Weather Outlook National Weather Service Green Bay WI 235 PM CDT Thu Apr 30 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- 235 PM CDT Thu Apr 30 2020 This Hazardous Weather Outlook is for north-central and northeast Wisconsin. .DAY ONE...Tonight The probability of widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Friday through Thursday No hazardous weather is expected at this time. .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- 235 PM CDT Thu Apr 30 2020 This Hazardous Weather Outlook is for portions of northwest Lake Michigan and the waters of Green Bay. .DAY ONE...Tonight A Small Craft Advisory remains in effect until 7pm for gusty north winds and large waves. .DAYS TWO THROUGH SEVEN...Friday through Thursday The probability for widespread hazardous weather is low. RDM/Uhlmann
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 was often under water due to 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, May 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: 879908, 879909.