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 Jun 30, 9:33 PM CST, 2 hours 27 minutes earlier.
Area Forecast Discussion National Weather Service Green Bay WI 1033 PM CDT Tue Jun 30 2020 Updated aviation portion for 06Z TAF issuance .SHORT TERM...Tonight and Wednesday Issued at 330 PM CDT Tue Jun 30 2020 Visible satellite imagery shows a field of agitated cumulus across much of central and north-central Wisconsin this afternoon along a weak surface boundary. CAMS models show there could be some isolated showers and thunderstorms from this field, however there is quite a bit of dry air aloft so confidence and coverage is rather low. A surface high and ridging aloft will become established across the Great Lakes region tonight into Wednesday. Although a mid level shortwave will approach the region from the west Wednesday afternoon, model soundings show quite a bit of dry air aloft with substantial capping from a warm layer around 800 mb. While previous model runs indicated some isolated showers and thunderstorms were possible Wednesday afternoon, recent model runs indicate these chances have fallen even further. Given the dry, warm air aloft will remove POPs Wednesday afternoon from the western cwa. After a warm and humid day, overnight lows will only fall into the 60s across the region. Another warm day is forecast for Wednesday as daytime highs rise into the middle to upper 80s, with a few 90 degree readings on the table. Despite the heat, the aforementioned high will bring dew points down into the lower to middle 60s during the afternoon hours, which should prevent heat index values from getting much above the air temperature. .LONG TERM...Wednesday Night Through Tuesday Issued at 330 PM CDT Tue Jun 30 2020 The main highlights from this forecast period are the various chances for showers and storms and the summer-like conditions with above normal temperatures and increased dew points. Wednesday night through Friday...Although an upper-level ridge will dominate over the region through Friday, a weak shortwave will slide into Wisconsin late Wednesday night into Thursday. Some models try to bring a few showers and storms to the forecast area during this time, however, there is too much dry air near the surface to allow anything significant from developing. Kept a chance for showers and storms for Thursday afternoon, but confidence is not very high with these occurring. Beyond Thursday afternoon, little to no chances of showers and storms are expected with the upper-level ridge still in place. High temperatures for Thursday and Friday will be about 10 to 15 degrees above normal in the upper 80s to lower 90s away from the lake, and the lower to middle 80s along the lake. In addition to the warmer temperatures, dew points in the middle to upper 60s will make for humid/muggy conditions. Rest of the extended...By Friday night, the upper-level ridge will begin to break down and eventually flatten. Model guidance is showing signs of a shortwave riding the flattening upper-level flow over the weekend. This shortwave could bring the next chance for showers and storms Sunday into Monday, followed by another shortwave Monday into Tuesday possibly bringing additional chances to the forecast area. The finer details associated with these shortwaves remain unclear at this time. Regardless of the finer details with these shortwaves, the above normal temperatures in the upper 80s to lower 90s are expected to continue through the weekend and into the beginning of next week. && .AVIATION...for 06Z TAF Issuance Issued at 1032 PM CDT Tue Jun 30 2020 High pressure at the surface and aloft will make for dry weather through at least Wednesday night. There will be some middle and high clouds at times, as well as scattered afternoon cumulus clouds well inland from the lake and bay. High moisture levels near the ground could make for patchy ground fog Wednesday morning, but it would dissipate by 12z if it occurs. The weather pattern was a bit unusual, as winds were easterly from the surface to over 30,000' and the freezing levels are unusually high - 15,400' at 6pm this evening. && .GRB WATCHES/WARNINGS/ADVISORIES... NONE. && SHORT TERM.....Kurimski LONG TERM......Hykin AVIATION.......RDM
Hazardous Weather Outlook National Weather Service Green Bay WI 244 PM CDT Tue Jun 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- 244 PM CDT Tue Jun 30 2020 This Hazardous Weather Outlook is for north-central and northeast Wisconsin. .DAY ONE...Tonight The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Wednesday through Tuesday Isolated thunderstorms will continue to be possible at times through Thursday and again Sunday and Monday, especially during the afternoon and evening hours. The probability of organized severe weather will be low, but heavy rain is possible with any of the storms. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated 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- 244 PM CDT Tue Jun 30 2020 This Hazardous Weather Outlook is for portions of northwest Lake Michigan and the waters of Green Bay. .DAY ONE...Tonight The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Wednesday through Tuesday Thunderstorms will be possible Sunday and Monday, especially during the afternoon and evening hours. Any thunderstorm that develop will pose a hazard to boaters on the lake and bay. Kurimski/Hykin
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, July 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: 897301, 897303.