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 Dec 31, 10:30 PM CST, 1 hour 30 minutes earlier.
Area Forecast Discussion National Weather Service Green Bay WI 1030 PM CST Tue Dec 31 2019 Updated aviation portion for 06Z TAF issuance and new information added to update section .UPDATE... Issued at 1022 PM CST Tue Dec 31 2019 Added some stratus and patchy fog to mainly north central WI overnight. Temperatures are going to be an issue, as they have already dropped to around zero in a few of the cold spots of far north central WI, but will likely rebound if/when the low clouds arrive. && .SHORT TERM...Tonight and Wednesday Issued at 229 PM CST Tue Dec 31 2019 The main forecast concern centers around how low to take temperatures down tonight as skies go mostly clear and there is fresh snow cover on the ground. The 20Z MSAS surface analysis showed a broad area of low pressure over extreme southeast Ontario. A modest ridge of high pressure stretched from the central Plains north-northeast into southern Canada. Visible satellite imagery indicated the back edge of low clouds approaching central WI with a gradual push to the east. The ridge of high pressure is expected to move into the western Great Lakes region tonight, bringing mostly clear skies, a diminishing west wind and a cold night to the forecast area. While there will be some increase in high clouds late tonight, this will not hold up temperatures. Look for readings to drop mainly into the 5 to 10 above zero range over northern and central WI, 10 to 15 degrees eastern WI and middle to upper teens near Lake MI. This surface ridge quickly shifts to the east by Wednesday morning, allowing winds to become south-southwest and bring weak WAA back to WI. Look for high/mid-clouds to move over northeast WI, thus skies will gradually become partly sunny to mostly cloudy by later Wednesday afternoon. Max temperatures for New Year's Day to be above normal with readings in the upper 20s north, lower to middle 30s south. .LONG TERM...Wednesday Night Through Tuesday Issued at 229 PM CST Tue Dec 31 2019 Precipitation forecast for Friday and Sunday are the main challenges for this period. The models continue to have differences with the speed and partial phasing of northern and southern stream shortwaves Friday. The GFS, NAM and Canadian suggest more phasing takes place, which produces a stronger surface system that is closer to Wisconsin. The ECMWF has less phasing, a much weaker surface system and no precipitation. Phasing systems are very challenging for man and computer, so will keep the chance of snow going for Friday with the best chance south of the forecast area. There are also significant differences in the models handling of a Clipper system north of the area Sunday or Sunday night. The jet energy for that system is over data sparse Pacific Ocean so not much confidence in that forecast either. It does look like it will be near or a little above normal temperature wise until the middle of next week. && .AVIATION...for 06Z TAF Issuance Issued at 1022 PM CST Tue Dec 31 2019 Had to switch gears with the forecast as low stratus has developed in parts of central and north central WI. Models focus most of the stratus and fog over north central and far northeast WI overnight into early Wednesday morning, so have trended the forecast in that direction. Otherwise, expect high and mid clouds to gradually increase across the area on Wednesday, with perhaps a few snow showers or flurries north of Rhinelander during the evening. Light west winds will become a bit gusty from the south-southwest on Wednesday. LLWS is expected at the GRB/ATW/MTW TAF sites Wednesday afternoon and evening. && .GRB WATCHES/WARNINGS/ADVISORIES... NONE. && UPDATE.........Kieckbusch SHORT TERM.....Kallas LONG TERM......RDM AVIATION.......Kieckbusch
Hazardous Weather Outlook National Weather Service Green Bay WI 240 PM CST Tue Dec 31 2019 WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-012045- 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- 240 PM CST Tue Dec 31 2019 This Hazardous Weather Outlook is for north-central and northeast Wisconsin. .DAY ONE...Tonight Colder temperatures and lingering moisture will bring slippery road conditions to much of northern and central Wisconsin tonight. An ice jam on the Oconto River will continue to bring flooding to parts of the City of Oconto. An Areal Flood Warning remains in effect. .DAYS TWO THROUGH SEVEN...Wednesday through Tuesday Accumulating snow will be possible on Friday and Friday night, and again on Sunday, but it is too early to forecast snow amounts. Other ice jams are possible, mainly across eastern Wisconsin. Ice jams can cause rivers to rise suddenly. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed tonight. LMZ521-522-541>543-012045- The Bay of Green Bay south of a line from Cedar River MI to Rock Island Passage-Lake Michigan from Washington Island to Sheboygan- 240 PM CST Tue Dec 31 2019 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 The probability for widespread hazardous weather is low. AK/RDM
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 high lake levels.
North Bayshore Road was often under water due to 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, January 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: 863585, 863586.