Alert archive / Wisconsin / Flash Flood Warnings in 2021
Flash Flood Warning 2, NWS Green Bay, WI
NWS Green Bay, WI issued this flash flood warning at Jul 15, 2021, 2:00 AM CDT for Calumet County, Manitowoc County, Winnebago County, Wisconsin. It was in force for 4 hr. 2 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jul 15, 2021, 2:00 AM CDT (07:00 UTC)
- Expired
- Jul 15, 2021, 6:00 AM CDT
- In force
- 4 hr
- Issued by
- NWS Green Bay, WI
- Area
- Storm-based polygon
- Flood severity
- None
Counties Calumet County, WI, Manitowoc County, WI, Winnebago County, WI
The radar
The Green Bay radar (KGRB), 55 km from the middle of the area, began a volume at 07:01 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 15, 2:16 AM CDT | HEAVY RAIN 4.31 | 2 Nne Oshkosh, WI | |
| Jul 15, 4:00 AM CDT | FLASH FLOOD | Manitowoc, WI | NUMEROUS REPORTS OF FLOODED, IMPASSABLE ROADS IN MANITOWOC AND SURROUNDING AREAS. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Green Bay/Straub, WI (KGRB), launched 00:00Z, 7.0 hours before the alert went out and 53 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
- 3 J/kg
- Mixed-layer CIN
- -195 J/kg
- Mixed-layer LCL
- 1171 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 83 m²/s²
- 0-3 km storm-relative helicity
- 207 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
070
WGUS53 KGRB 150700
FFWGRB
WIC015-071-139-151100-
/O.NEW.KGRB.FF.W.0002.210715T0700Z-210715T1100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Green Bay WI
200 AM CDT Thu Jul 15 2021
The National Weather Service in Green Bay has issued a
* Flash Flood Warning for...
Calumet County in east central Wisconsin...
Manitowoc County in east central Wisconsin...
Eastern Winnebago County in east central Wisconsin...
* Until 600 AM CDT.
* At 200 AM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 2 and 4 inches of rain
have fallen. Additional rainfall amounts to 1 inch, locally up to
2 inches, are possible in the warned area. Flash flooding is
ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
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...
Oshkosh, Manitowoc, Chilton, Brillion, Cleveland, Valders, St.
Nazianz, Two Creeks, Camp Rokilio Scout Camp, St Anna, High Cliff
State Park, Two Rivers, Harrison, Kiel, New Holstein, Sherwood,
Newton and Cato.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 4389 8864 4412 8856 4433 8749 4418 8745
4407 8759 4390 8767 4389 8816 4394 8816
4394 8840 4389 8840
FLASH FLOOD...RADAR INDICATED
$$
MPC3 follow-up statements
304
WGUS73 KGRB 150758
FFSGRB
Flash Flood Statement
National Weather Service Green Bay WI
258 AM CDT Thu Jul 15 2021
WIC015-071-139-151100-
/O.CON.KGRB.FF.W.0002.000000T0000Z-210715T1100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Calumet WI-Manitowoc WI-Winnebago WI-
258 AM CDT Thu Jul 15 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 6 AM CDT EARLY THIS
MORNING FOR CALUMET, MANITOWOC AND EASTERN WINNEBAGO COUNTIES...
At 258 AM CDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 2 and 5 inches of rain have
fallen. Additional rainfall amounts up to 1 inch are possible in the
warned area. Flash flooding is ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Oshkosh, Manitowoc, Chilton, Brillion, Cleveland, Valders, St.
Nazianz, Two Creeks, Camp Rokilio Scout Camp, St Anna, High Cliff
State Park, Two Rivers, Harrison, Kiel, New Holstein, Sherwood,
Newton and Cato.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.
&&
LAT...LON 4389 8864 4412 8856 4433 8749 4418 8745
4407 8759 4390 8767 4389 8816 4394 8816
4394 8840 4389 8840
FLASH FLOOD...RADAR INDICATED
$$
Skowronski476
WGUS73 KGRB 150832
FFSGRB
Flash Flood Statement
National Weather Service Green Bay WI
332 AM CDT Thu Jul 15 2021
WIC015-071-139-151100-
/O.CON.KGRB.FF.W.0002.000000T0000Z-210715T1100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Calumet WI-Manitowoc WI-Winnebago WI-
332 AM CDT Thu Jul 15 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 6 AM CDT EARLY THIS
MORNING FOR CALUMET, MANITOWOC AND EASTERN WINNEBAGO COUNTIES...
At 332 AM CDT, Doppler radar and automated rain gauges indicated
that thunderstorms earlier in the night produced heavy rain across
the warned area. Between 2 and 5 inches of rain were reported. Flash
flooding is ongoing.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar and automated gauges.
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...
Oshkosh, Manitowoc, Chilton, Brillion, Cleveland, Valders, St.
Nazianz, Two Creeks, Camp Rokilio Scout Camp, St Anna, High Cliff
State Park, Two Rivers, Harrison, Kiel, New Holstein, Sherwood,
Newton and Cato.
Although the heavy rain was now southeast of the area, scattered
showers may persist through daybreak. Runoff from the rainfall will
continue, and it will take a little while for standing water to
subside.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.
&&
LAT...LON 4389 8864 4412 8856 4433 8749 4418 8745
4407 8759 4390 8767 4389 8816 4394 8816
4394 8840 4389 8840
FLASH FLOOD...RADAR AND GAUGE INDICATED
$$
Skowronski854
WGUS73 KGRB 151013
FFSGRB
Flash Flood Statement
National Weather Service Green Bay WI
513 AM CDT Thu Jul 15 2021
WIC015-071-139-151100-
/O.CON.KGRB.FF.W.0002.000000T0000Z-210715T1100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Calumet WI-Manitowoc WI-Winnebago WI-
513 AM CDT Thu Jul 15 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 6 AM CDT EARLY THIS
MORNING FOR CALUMET, MANITOWOC AND EASTERN WINNEBAGO COUNTIES...
At 513 AM CDT, Doppler radar and automated rain gauges indicated
that thunderstorms produced 2 to 5 inches of rain across the warned
area overnight. Some roads are closed due to flooding.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar and automated gauges.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Oshkosh, Manitowoc, Chilton, Brillion, Cleveland, Valders, St.
Nazianz, Two Creeks, Camp Rokilio Scout Camp, St Anna, High Cliff
State Park, Two Rivers, Harrison, Kiel, New Holstein, Sherwood,
Newton and Cato.
Runoff from the heavy rains will continue, and it will take a little
while for standing water to subside. In addition, occasional light
rain and drizzle may linger for another hour or two before ending.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Be aware of your surroundings and do not drive on flooded roads.
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4389 8864 4412 8856 4433 8749 4418 8745
4407 8759 4390 8767 4389 8816 4394 8816
4394 8840 4389 8840
FLASH FLOOD...RADAR AND GAUGE INDICATED
$$
SkowronskiThe office that day
Everything else NWS Green Bay, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 14, 7:49 PM CDT | Special Weather Statement | GRB | Brown, Calumet, Kewaunee, Manitowoc, Outagamie, Portage and 4 more | 41 min |
| Jul 14, 8:44 PM CDT | Special Weather Statement | GRB | Brown, Calumet, Manitowoc, Outagamie, Waupaca, Waushara and 1 more | 31 min |
| Jul 14, 10:06 PM CDT | Special Weather Statement | GRB | Brown, Calumet, Door, Kewaunee, Manitowoc, Outagamie and 2 more | 54 min |
| Jul 14, 10:48 PM CDT | Areal Flood Advisory | GRB | Brown, Calumet, Kewaunee, Manitowoc, Outagamie, Winnebago | 6 hr |
| Jul 14, 11:31 PM CDT | Flash Flood Warning | GRB | Calumet, Manitowoc, Winnebago | 3 hr |
| Jul 15, 5:22 AM CDT | River Flood Warning | GRB | Manitowoc | 11 hr |
| Jul 15, 5:56 AM CDT | Areal Flood Advisory | GRB | Calumet, Manitowoc, Winnebago | 3 hr |
| Jul 15, 3:13 PM CDT | River Flood Warning | GRB | Brown | 7 hr |
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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.