Alert archive / Wisconsin / Flash Flood Watches in 2021
Flash Flood Watch 1, NWS Green Bay, WI
NWS Green Bay, WI issued this flash flood watch at Aug 7, 2021, 6:56 PM CDT for 12 counties in Wisconsin. It was in force for 25 hr.
The area
The counties it named.
The facts
- Issued
- Aug 7, 2021, 6:56 PM CDT (23:56 UTC)
- Expired
- Aug 8, 2021, 7:56 PM CDT
- In force
- 25 hr
- Issued by
- NWS Green Bay, WI
- Flood severity
- None
Counties Brown County, WI, Calumet County, WI, Kewaunee County, WI, Manitowoc County, WI, Marathon County, WI, Outagamie County, WI, Portage County, WI, Shawano County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI, Wood County, WI
The radar
The Green Bay radar (KGRB), 51 km from the middle of the area, began a volume at 23:55 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Green Bay/Straub, WI (KGRB), launched 12:00Z, 11.9 hours before the alert went out and 51 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 20 J/kg
- Mixed-layer CIN
- -32 J/kg
- Mixed-layer LCL
- 656 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 72 m²/s²
- 0-3 km storm-relative helicity
- 103 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
994 WGUS63 KGRB 072356 FFAGRB URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Green Bay WI 656 PM CDT Sat Aug 7 2021 WIZ030-035>038-045-048-080800- /O.NEW.KGRB.FF.A.0001.210807T2356Z-210808T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Marathon-Wood-Portage-Waupaca-Outagamie-Waushara-Winnebago- Including the cities of New London, Redgranite, Plover, Marshfield, Menasha, Neenah, Wausau, Wisconsin Rapids, Stevens Point, Wautoma, Appleton, Clintonville, Oshkosh, and Waupaca 656 PM CDT Sat Aug 7 2021 ...FLASH FLOOD WATCH IN EFFECT THROUGH SUNDAY MORNING... The National Weather Service in Green Bay has issued a * Flash Flood Watch for Portions of central, east central, and northeast Wisconsin, including the following areas, in central Wisconsin, Marathon, Portage, Waushara and Wood. In east central Wisconsin, Winnebago. In northeast Wisconsin, Outagamie and Waupaca. * Through Sunday morning. * Rounds of thunderstorms, some producing very heavy rainfall, are expected tonight. Rainfall amounts of 2 to 4 inches, with locally higher amounts possible. This will lead to the possibility of flash flooding. * Flash flooding of creeks, streams, urban areas, and low lying areas is possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Cooley
5 follow-up statements
841 WGUS63 KGRB 080443 FFAGRB Flood Watch National Weather Service Green Bay WI 1143 PM CDT Sat Aug 7 2021 WIZ030-037-038-080545- /O.CAN.KGRB.FF.A.0001.000000T0000Z-210808T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Marathon-Waupaca-Outagamie- Including the cities of Wausau, New London, Appleton, Clintonville, and Waupaca 1143 PM CDT Sat Aug 7 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for Portions of central and northeast Wisconsin, including the following areas, in central Wisconsin, Marathon. In northeast Wisconsin, Outagamie and Waupaca. has been cancelled. The Flood Watch is cancelled. $$ WIZ035-036-045-048-081200- /O.CON.KGRB.FF.A.0001.000000T0000Z-210808T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Wood-Portage-Waushara-Winnebago- Including the cities of Plover, Marshfield, Menasha, Neenah, Wisconsin Rapids, Stevens Point, Wautoma, Redgranite, and Oshkosh 1143 PM CDT Sat Aug 7 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 7 AM CDT SUNDAY... The Flash Flood Watch continues for * Portions of central and east central Wisconsin, including the following areas, in central Wisconsin, Portage, Waushara and Wood. In east central Wisconsin, Winnebago. * Until 7 AM CDT Sunday. * Additional rounds of showers and thunderstorms, some producing very heavy rainfall, are expected through early Sunday morning. Additional rainfall amounts up to 1 inch will be possible before the precipitation diminishes. This will lead to the possibility of flash flooding, especially where heavy rainfall occurred Saturday evening. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Cooley
012 WGUS63 KGRB 080836 FFAGRB URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Green Bay WI 336 AM CDT Sun Aug 8 2021 WIZ030-031-037>039-049-081645- /O.EXB.KGRB.FF.A.0001.000000T0000Z-210809T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Marathon-Shawano-Waupaca-Outagamie-Brown-Calumet- Including the cities of Green Bay, Brillion, New London, Wausau, Shawano, Chilton, New Holstein, Waupaca, Clintonville, and Appleton 336 AM CDT Sun Aug 8 2021 ...FLASH FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT... The National Weather Service in Green Bay has expanded the * Flash Flood Watch to include Portions of central, east central, and northeast Wisconsin, including the following areas, in central Wisconsin, Marathon. In east central Wisconsin, Calumet. In northeast Wisconsin, Brown, Outagamie, Shawano and Waupaca. * Through late tonight. * Heavy rains from last night have made for wet ground and rising rivers and streams. Additional heavy rain from thunderstorms is expected, especially during the afternoon and evening hours, which may cause flooding of urban areas, small streams and basements. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. Make sure your sump pump is working, and be ready to move to higher ground if a warning is issued. Do not drive on flooded roadways. && $$ WIZ035-036-045-048-081645- /O.EXT.KGRB.FF.A.0001.000000T0000Z-210809T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Wood-Portage-Waushara-Winnebago- Including the cities of Plover, Marshfield, Menasha, Neenah, Wisconsin Rapids, Stevens Point, Wautoma, Redgranite, and Oshkosh 336 AM CDT Sun Aug 8 2021 ...FLASH FLOOD WATCH NOW IN EFFECT THROUGH LATE TONIGHT... The Flash Flood Watch is now in effect for * Portions of central and east central Wisconsin, including the following areas, in central Wisconsin, Portage, Waushara and Wood. In east central Wisconsin, Winnebago. * Through late tonight. * Heavy rains from last night has made for wet ground and rising rivers and streams. Thunderstorms will bring additional heavy rain, especially this afternoon and tonight, which may produce flooding of urban areas, small streams and basements. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. Make sure your sump pump works, and be ready to move to high ground if a flood warning is issued. Do not drive on flooded roadways. && $$ RDM
936 WGUS63 KGRB 081551 FFAGRB URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Green Bay WI 1051 AM CDT Sun Aug 8 2021 WIZ040-050-090000- /O.EXA.KGRB.FF.A.0001.000000T0000Z-210809T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Kewaunee-Manitowoc- Including the cities of Two Rivers, Manitowoc, Luxemburg, and Kewaunee 1051 AM CDT Sun Aug 8 2021 ...FLASH FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT... The National Weather Service in Green Bay has expanded the * Flash Flood Watch to include Portions of east central and northeast Wisconsin, including the following areas, in east central Wisconsin, Manitowoc. In northeast Wisconsin, Kewaunee. * Through late tonight. * Heavy rains from last night has made for wet ground and rising rivers and streams. Thunderstorms will bring additional heavy rain, especially this afternoon and tonight, which may produce flooding of urban areas, small streams and basements. The best potential for additional heavy rainfall is between 3PM and 10PM central time. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ WIZ030-031-035>039-045-048-049-090000- /O.CON.KGRB.FF.A.0001.000000T0000Z-210809T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Marathon-Shawano-Wood-Portage-Waupaca-Outagamie-Brown-Waushara- Winnebago-Calumet- Including the cities of Green Bay, Brillion, New London, Redgranite, Plover, Marshfield, Menasha, Neenah, Wausau, Wisconsin Rapids, Stevens Point, Shawano, Chilton, New Holstein, Wautoma, Appleton, Clintonville, Oshkosh, and Waupaca 1051 AM CDT Sun Aug 8 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH LATE TONIGHT... The Flash Flood Watch continues for * Portions of central, east central, and northeast Wisconsin, including the following areas, in central Wisconsin, Marathon, Portage, Waushara and Wood. In east central Wisconsin, Calumet and Winnebago. In northeast Wisconsin, Brown, Outagamie, Shawano and Waupaca. * Through late tonight. * Heavy rains from last night has made for wet ground and rising rivers and streams. Thunderstorms will bring additional heavy rain, especially this afternoon and tonight, which may produce flooding of urban areas, small streams and basements. The best potential for additional heavy rainfall is between 3PM and 10PM central time. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Uhlmann
510 WGUS63 KGRB 082027 FFAGRB Flood Watch National Weather Service Green Bay WI 327 PM CDT Sun Aug 8 2021 WIZ030-031-035>040-045-048>050-090430- /O.CON.KGRB.FF.A.0001.000000T0000Z-210809T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Marathon-Shawano-Wood-Portage-Waupaca-Outagamie-Brown-Kewaunee- Waushara-Winnebago-Calumet-Manitowoc- Including the cities of Brillion, New London, Clintonville, Oshkosh, Appleton, Marshfield, Neenah, Wausau, Manitowoc, Chilton, Luxemburg, Waupaca, Green Bay, Redgranite, Plover, Menasha, Two Rivers, Wisconsin Rapids, Stevens Point, Shawano, New Holstein, Wautoma, and Kewaunee 327 PM CDT Sun Aug 8 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 1 AM CDT MONDAY... The Flash Flood Watch continues for * Portions of central, east central, and northeast Wisconsin, including the following areas, in central Wisconsin, Marathon, Portage, Waushara and Wood. In east central Wisconsin, Calumet, Manitowoc and Winnebago. In northeast Wisconsin, Brown, Kewaunee, Outagamie, Shawano and Waupaca. * Until 1 AM CDT Monday. * Thunderstorms will overspread central to east-central Wisconsin this afternoon and evening, with the heaviest rainfall potential lasting through around 10 PM. Another inch is possible in many of the areas that received heavy rainfall last night, with locally higher amounts under the strongest storms. The additional rainfall is expected to pose an urban and small stream flash flooding concern. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Uhlmann
324 WGUS63 KGRB 090056 FFAGRB Flood Watch National Weather Service Green Bay WI 756 PM CDT Sun Aug 8 2021 WIZ030-031-035>040-045-048>050-090200- /O.CAN.KGRB.FF.A.0001.000000T0000Z-210809T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Marathon-Shawano-Wood-Portage-Waupaca-Outagamie-Brown-Kewaunee- Waushara-Winnebago-Calumet-Manitowoc- Including the cities of Brillion, New London, Clintonville, Oshkosh, Appleton, Marshfield, Neenah, Wausau, Manitowoc, Chilton, Luxemburg, Waupaca, Green Bay, Redgranite, Plover, Menasha, Two Rivers, Wisconsin Rapids, Stevens Point, Shawano, New Holstein, Wautoma, and Kewaunee 756 PM CDT Sun Aug 8 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for Portions of central, east central, and northeast Wisconsin, including the following areas, in central Wisconsin, Marathon, Portage, Waushara and Wood. In east central Wisconsin, Calumet, Manitowoc and Winnebago. In northeast Wisconsin, Brown, Kewaunee, Outagamie, Shawano and Waupaca. has been cancelled. The Flood Watch is cancelled. Flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. $$ Cooley
Nearby
Flash Flood Watches in Wisconsin, 2021Every flash flood watch in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.