Thunderstorms moved east along a stalled out frontal boundary through central and east-central Wisconsin during the morning and early afternoon hours. 1 to 3 inches of rain fell during the morning and afternoon hours.
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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 GRB wrote it up.
Thunderstorms moved east along a stalled out frontal boundary through central and east-central Wisconsin during the morning and early afternoon hours. 1 to 3 inches of rain fell during the morning and afternoon hours. There were multiple reports of flash flooding with streets flooded, businesses and residents evacuated, and some water rescues from stranded motorists. Northeast winds backed up the Fox River and exacerbated the flooding as rainfall could not drain into area rivers efficiently.
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 Sep 11, 5:34 AM CST, 2 hours 26 minutes earlier.
Area Forecast Discussion National Weather Service Green Bay WI 634 AM CDT Wed Sep 11 2019 Updated aviation portion for 12Z TAF issuance .SHORT TERM...Today...Tonight...and Thursday Issued at 308 AM CDT Wed Sep 11 2019 A stalled frontal boundary across southern Wisconsin will be the driving force behind several rounds of moderate to heavy rain across northeast Wisconsin through at least Thursday. CAPE profiles during this period will be long and skinny with PWAT values of 1.5 to 2 inches, which will enhance the heavy rain threat. This morning a thunderstorm complex across Minnesota will track east through the area during the morning hours. There is still uncertainty as to how this complex will track through the area as the HRRR takes this feature northeast and wipes out much of the rainfall during the morning hours. Meanwhile other models such as the ARW and NMM maintain this system as it tracks east and brings copious amounts of rain across central and east-central Wisconsin this morning. Later this afternoon convection is expected to fire just north of the boundary across the far southern cwa and into southern Wisconsin. This activity will be along a fairly substantial CAPE gradient and could produce severe storms if the instability can inch far enough north given the fairly high bulk shear values of 40 to 50 knots. The main severe weather threat this afternoon would be gusty winds and heavy rainfall. Isentropic lift could continue the rainfall across the area during the overnight hours as the frontal boundary remains just to the south. By Thursday a substantial shortwave will track through the western Great Lakes region as the surface low approaches from the west. There could be some showers and thunderstorms on Thursday as these features approach the area, however the more substantial rain is expected to hold off until Thursday night. .LONG TERM...Thursday Night Through Tuesday Issued at 308 AM CDT Wed Sep 11 2019 The latest ensemble means continue to point towards above normal warmth for much of this period, outside of a brief cool down on Friday into Saturday. Despite the warmer weather, models generally indicate that a relatively quiet period will occur this weekend into next week as strong mid-level ridging builds into the region. Therefore, forecast concerns generally revolve around the potential for severe weather and heavy rainfall on Thursday night. Thursday night through Friday night...Occluded low pressure over northern Minnesota will push a strong cold front across the region on Thursday night. Ahead of the front, a 40-45 kt low level jet will lead to impressive moisture transport values with pwats upwards of 2 standard deviations above normal (greater than 1.75 in). Instability remains unimpressive (most unstable capes of 600-1000 j/kg). But with the strong wind fields aloft and sufficient instability, some concern that the stronger downpours could bring those beefy winds to the surface. The main threat, however, will be the heavy rainfall as most guidance indicates 1 to 2 inches of precip will be possible for much of the area. Showers and storms will come to an end late in the night or early Friday morning as the front exits. A brief period of clearing is possible within the dry slot on Friday morning. Then comma head moisture should quickly return and spread across the region from west to east during the day. Moisture depth increases for a time and forecast soundings show saturation depth looks to get deep enough for a chance of showers over central and north-central WI. Although clouds will hold back low level lapse rates some, bufkit soundings suggest southwest to west winds could gust to 30 to 40 mph from late morning through the afternoon. Clouds should linger into Friday evening before clearing late. Rest of the forecast...A surface ridge axis will move across the region on Saturday, which should result in ample sunshine. After the ridge axis departs, southwest flow will lead to another surge of warm/moist advection on Saturday night into Sunday. Models spit out light qpf during this time period, but it appears that ample instability will return on Sunday, so continue to wonder if precip chances are under done. Warm air will continue to surge into the area early next week, which looks mid-Summer like. && .AVIATION...for 12Z TAF Issuance Issued at 634 AM CDT Wed Sep 11 2019 Some morning fog will continue to plague some of the TAF sites this morning before a thunderstorm complex barrels through the region later this morning and into the afternoon hours. Cigs and vsbys will be reduced at times to IFR under the heavier rain and thunderstorms. Additional showers and thunderstorms are expected this afternoon and could last into the overnight hours, especially across central and east-central Wisconsin as a lingering frontal boundary stays to the south. Flying conditions will continue to remain poor as these rounds of convection roll through the region, falling to IFR at times. Although additional thunderstorms are possible this afternoon and overnight will not include 20 plus hours of thunderstorms with this set of TAFs but focus on this mornings convection and add more thunder in pending this afternoons activity. && .HYDROLOGY... Issued at 308 AM CDT Wed Sep 11 2019 Several rounds of moderate to heavy rain from today through Thursday night could produce some flooding across the area. The biggest threat will be across central and east-central Wisconsin where areas have already received 1 to 2 inches of rain on Tuesday with another 2 to 4 inches with locally higher amounts possible during the next few days. These areas may see urban flooding and rising water levels on area rivers and streams. A Flash Flood Watch may be needed in subsequent forecasts depending on how this mornings complex affects the area. && .GRB WATCHES/WARNINGS/ADVISORIES... NONE. && SHORT TERM.....Kurimski LONG TERM......MPC AVIATION.......Kurimski HYDROLOGY......Kurimski
Hazardous Weather Outlook National Weather Service Green Bay WI 309 AM CDT Wed Sep 11 2019 WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-120815- 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- 309 AM CDT Wed Sep 11 2019 This Hazardous Weather Outlook is for north-central and northeast Wisconsin. .DAY ONE...Today and Tonight There is a slight risk of severe thunderstorms over parts of central and east-central Wisconsin today. Damaging winds and localized urban and small stream flooding will be the primary threats in the strongest storms. In addition, gusty northeast winds off the Bay of Green Bay may also cause water to back up on the East River, Fox River and Duck Creek this afternoon and tonight. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday Thunderstorms are expected to continue at times on Thursday and Thursday night. Heavy rainfall will be the most likely threat during this period, but there is also a marginal risk of severe storms over parts of central Wisconsin. The heavy rains will likely cause localized urban and small stream flooding. Hazardous swimming conditions are possible Thursday afternoon into Friday along Lake Michigan beaches. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed across central and east-central Wisconsin today. LMZ521-522-541>543-120815- The Bay of Green Bay south of a line from Cedar River MI to Rock Island Passage-Lake Michigan from Washington Island to Sheboygan- 309 AM CDT Wed Sep 11 2019 This Hazardous Weather Outlook is for portions of northwest Lake Michigan and the waters of Green Bay. .DAY ONE...Today and Tonight Thunderstorms are possible at times from late this morning through tonight. Any storms could pose a hazard to mariners. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday Hazardous conditions for small craft may also occur Thursday afternoon into Friday. Kurimski/MPC
Special Weather Statement National Weather Service Green Bay WI 514 AM CDT Wed Sep 11 2019 WIZ022-039-040-073-074-111315- Door-Brown-Kewaunee-Southern Marinette County- Southern Oconto County- 514 AM CDT Wed Sep 11 2019 ...PATCHY DENSE FOG AND DRIZZLE NEAR THE BAY OF GREEN BAY THIS MORNING... Look for patchy dense fog and drizzle across northeast Wisconsin near the bay of Green Bay during the morning hours. The fog and drizzle will reduce visibilities to below 1 mile at times, and may occasionally reduce visibilities to one quarter of a mile or less. Motorists traveling across the area and during the morning commute should exercise caution, as visibilities can drop significantly in a very short distance. Kurimski
Special Weather Statement National Weather Service Green Bay WI 809 AM CDT Wed Sep 11 2019 WIZ010-018>020-030-031-035>038-045-048-111615- Oneida-Lincoln-Langlade-Menominee-Marathon-Shawano-Wood-Portage- Waupaca-Outagamie-Waushara-Winnebago- 809 AM CDT Wed Sep 11 2019 ...THUNDERSTORMS WITH TORRENTIAL RAINFALL EXPECTED THIS MORNING... At 808 AM CDT, Doppler radar indicated a line of thunderstorms with heavy rain and frequent lightning extending from 10 miles southwest of New Wood Wildlife Area to near New London. The storms were moving northeast at 30 mph. Torrential rainfall is occurring with the storms, and may cause localized flooding. Do not drive your vehicle through flooded roadways. Turn around, don't drown! MG
The Green Bay radar (KGRB), 34 km away, was scanning. The volume nearest the first event began at 13:58 UTC.
2 flash flood. Local standard time, as filed.
Street closed due to flash flooding and vehicles stranded in Darboy. A culvert was washed out in the village of Sherwood.
Heavy rainfall caused street flooding across much of the east side of Green Bay and De Pere. There were multiple reports of streets closed, businesses evacuated, vehicles stranded and rescues from the high water. Businesses were evacuated on Mason Street on the east side of Green Bay between Main Street and Lime Kiln Road, Monroe Road in Bellevue was closed from WI-172 to Dickinson Road, there was 3 to 4 feet of water on Red Maple Road in De Pere under the railroad underpass, Ledgeview Road in De Pere was closed between Winding Waters Way and Creamery Road, Bellevue Street in Bellevue was closed from Debra Lane to Allouez Avenue, Wrightstown Road in De Pere was closed between River Oaks Drive and Greenleaf Road, and Huron Road in Bellevue was closed from Easton Road to Yeager Drive due to flash flooding.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wisconsin in 2019Every state in 2019This day in weather historyWarnings in Wisconsin, September 2019
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: 848523, 849550.