Alert archive / Wisconsin / Flash Flood Warnings in 2021
Flash Flood Warning 9, NWS Green Bay, WI
NWS Green Bay, WI issued this flash flood warning at Aug 28, 2021, 11:08 PM CDT for Calumet County, Manitowoc County, Wisconsin. It was in force for 89 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 28, 2021, 11:08 PM CDT (04:08 UTC)
- Expired
- Aug 29, 2021, 12:37 AM CDT
- In force
- 89 min
- Issued by
- NWS Green Bay, WI
- Area
- Storm-based polygon
- Flood severity
- None
Counties Calumet County, WI, Manitowoc County, WI
The radar
The Green Bay radar (KGRB), 61 km from the middle of the area, began a volume at 04:08 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 00:00Z, 4.1 hours before the alert went out and 58 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
- 969 J/kg
- Mixed-layer CIN
- -84 J/kg
- Mixed-layer LCL
- 1292 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 70 m²/s²
- 0-3 km storm-relative helicity
- 110 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 2.0
The text
As transmitted.
846
WGUS53 KGRB 290408
FFWGRB
WIC015-071-290700-
/O.NEW.KGRB.FF.W.0009.210829T0408Z-210829T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Green Bay WI
1108 PM CDT Sat Aug 28 2021
The National Weather Service in Green Bay has issued a
* Flash Flood Warning for...
Southeastern Calumet County in east central Wisconsin...
Southwestern Manitowoc County in east central Wisconsin...
* Until 200 AM CDT.
* At 1108 PM CDT, local law enforcement reported thunderstorms
producing heavy rain across the warned area. Between 2 and 3
inches of rain have fallen. Additional rainfall amounts of 1 to 2
inches are possible in the warned area. Flash flooding is already
occurring.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Law enforcement reported.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
Manitowoc, Cleveland, St. Nazianz, Camp Rokilio Scout Camp, St
Anna, Central Lake Winnebago, Kiel, New Holstein, Newton, Spring
Valley, Brothertown, Clover, St Nazianz, School Hill, Louis
Corners, Steinthal, Millhome, Osman, Meggers and Newtonberg.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 4399 8831 4403 8804 4409 8763 4397 8764
4390 8767 4389 8808 4389 8814 4389 8816
4394 8816 4394 8832
FLASH FLOOD...OBSERVED
$$
Kurimski1 follow-up statement
342
WGUS73 KGRB 290537
FFSGRB
Flash Flood Statement
National Weather Service Green Bay WI
1237 AM CDT Sun Aug 29 2021
WIC015-071-290547-
/O.CAN.KGRB.FF.W.0009.000000T0000Z-210829T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Calumet WI-Manitowoc WI-
1237 AM CDT Sun Aug 29 2021
...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHEASTERN CALUMET AND
SOUTHWESTERN MANITOWOC COUNTIES...
Local law enforcement indicated that flood waters have receded and
the heaviest rain has ended. Flooding is no longer expected to pose
a significant threat. Please continue to heed remaining road
closures.
LAT...LON 4399 8831 4403 8804 4409 8763 4397 8764
4390 8767 4389 8808 4389 8814 4389 8816
4394 8816 4394 8832
$$
KurimskiThe office that day
Everything else NWS Green Bay, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 28, 8:48 PM CDT | Special Weather Statement | GRB | Florence | 42 min |
| Aug 28, 9:02 PM CDT | Special Weather Statement | GRB | Manitowoc | 43 min |
| Aug 28, 10:06 PM CDT | Areal Flood Advisory | GRB | Calumet, Manitowoc | 62 min |
| Aug 28, 10:24 PM CDT | River Flood Warning | GRB | Wood | 21 days |
| Aug 28, 10:38 PM CDT | Areal Flood Advisory | GRB | Portage, Waupaca, Wood | 3 hr |
| Aug 28, 11:22 PM CDT | Flash Flood Warning | GRB | Portage, Waupaca | 3 hr |
| Aug 29, 12:08 AM CDT | Areal Flood Advisory | GRB | Outagamie | 3 hr |
| Aug 29, 1:15 AM CDT | Special Marine Warning | GRB | 34 min |
Nearby
Flash Flood Warnings in Wisconsin, 2021Every flash flood warning 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.