Alert archive / Wisconsin / Flash Flood Warnings in 2021

Flash Flood Warning 5, NWS Green Bay, WI

August 11, 2021Marathon County, Wisconsin

NWS Green Bay, WI issued this flash flood warning at Aug 11, 2021, 3:07 PM CDT for Marathon County, Wisconsin. It was in force for 4 hr. 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 11, 2021, 3:07 PM CDT (20:07 UTC)
Expired: Aug 11, 2021, 7:00 PM CDT
In force: 4 hr
Issued by: NWS Green Bay, WI
Area: Storm-based polygon
Flood severity: None

County Marathon County, WI

The radar

The Green Bay radar (KGRB), 106 km from the middle of the area, began a volume at 20:09 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, 8.1 hours before the alert went out and 108 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1499 J/kg
Mixed-layer CIN: -136 J/kg
Mixed-layer LCL: 678 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 156 m²/s²
0-3 km storm-relative helicity: 206 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.1

Open this sounding in Storm Lab

The text

As transmitted.

304 
WGUS53 KGRB 112007
FFWGRB
WIC073-112300-
/O.NEW.KGRB.FF.W.0005.210811T2007Z-210811T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Green Bay WI
307 PM CDT Wed Aug 11 2021

The National Weather Service in Green Bay has issued a

* Flash Flood Warning for...
  Southeastern Marathon County in central Wisconsin...

* Until 600 PM CDT.

* At 307 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 3 inches of rain 
  have fallen. Additional rainfall amounts of 1 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...
  Weston, Mosinee, Bevent, Rothschild, Knowlton, Ringle, Norrie, 
  Birnamwood, Hatley, Eland, Elderon, Peplin, Rocky Corners, Pike 
  Lake, Holt, Moon, Galloway, Big Eau Pleine County Park and 
  Rozellville.

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 4477 8922 4469 8923 4469 9004 4478 9004
      4479 8961 4489 8960 4497 8922 4494 8922
      4492 8922 4487 8922 4485 8922 4484 8922
      4483 8922 4480 8922 4479 8922

FLASH FLOOD...RADAR INDICATED

$$

Bersch

3 follow-up statements

068 
WGUS53 KGRB 112203
FFWGRB
WIC073-120000-
/O.EXT.KGRB.FF.W.0005.000000T0000Z-210812T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Green Bay WI
503 PM CDT Wed Aug 11 2021

The National Weather Service in Green Bay has extended the

* Flash Flood Warning for...
  Southeastern Marathon County in central Wisconsin...

* Until 700 PM CDT.

* At 503 PM CDT, Emergency management reported significant flooding 
  in Kronenwetter. Between 2 and 5 inches of rain have fallen. 
  Little to no additional rainfall is expected, however runoff will 
  continue to produce flooding area. Flash flooding is already 
  occurring.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Emergency management 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...
  Weston, Mosinee, Bevent, Rothschild, Knowlton, Ringle, Norrie, 
  Birnamwood, Hatley, Eland, Elderon, Peplin, Rocky Corners, Pike 
  Lake, Holt, Moon, Galloway, Big Eau Pleine County Park and 
  Rozellville.

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 4477 8922 4469 8923 4469 9004 4478 9004
      4479 8961 4489 8960 4497 8922 4494 8922
      4492 8922 4487 8922 4485 8922 4484 8922
      4483 8922 4480 8922 4479 8922

FLASH FLOOD...OBSERVED

$$

Bersch

210 
WGUS73 KGRB 112227
FFSGRB

Flash Flood Statement
National Weather Service Green Bay WI
527 PM CDT Wed Aug 11 2021

WIC073-120000-
/O.CON.KGRB.FF.W.0005.000000T0000Z-210812T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Marathon WI-
527 PM CDT Wed Aug 11 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 7 PM CDT THIS EVENING 
FOR SOUTHEASTERN MARATHON COUNTY...

At 527 PM CDT, Emergency management reported significant flooding in 
Kronenwetter. Between 2 and 5 inches of rain have fallen. Little to 
no additional rainfall is expected, however runoff will continue to 
produce flooding area. Flash flooding is already occurring.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Emergency management 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...
  Weston, Mosinee, Rothschild, Knowlton, Ringle, Norrie, Birnamwood, 
  Hatley, Eland, Peplin, Rocky Corners, Pike Lake, Moon and Big Eau 
  Pleine County Park.

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 4477 8938 4472 8952 4470 8984 4478 8986
      4479 8961 4487 8959 4492 8935 4494 8922
      4492 8922 4487 8922 4485 8922 4484 8922
      4483 8922 4481 8925 4480 8930

FLASH FLOOD...OBSERVED

$$

Bersch

124 
WGUS73 KGRB 112356
FFSGRB

Flash Flood Statement
National Weather Service Green Bay WI
656 PM CDT Wed Aug 11 2021

WIC073-120006-
/O.EXP.KGRB.FF.W.0005.000000T0000Z-210812T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Marathon WI-
656 PM CDT Wed Aug 11 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 7 PM CDT THIS EVENING FOR 
SOUTHEASTERN MARATHON COUNTY...

Flood waters continue to slowly receded. The heavy rain has ended. 
Flooding is no longer expected to pose a threat. Please continue to 
heed remaining road closures.

LAT...LON 4477 8938 4472 8952 4470 8984 4478 8986
      4479 8961 4487 8959 4492 8935 4494 8922
      4492 8922 4487 8922 4485 8922 4484 8922
      4483 8922 4481 8925 4480 8930

$$

Bersch

The office that day

Everything else NWS Green Bay, WI issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 10, 7:00 PM CDT	Special Marine Warning	GRB		60 min
Aug 10, 7:06 PM CDT	Special Marine Warning	GRB		54 min
Aug 10, 7:11 PM CDT	Flash Flood Warning	GRB	Brown	3 hr
Aug 10, 7:20 PM CDT	Special Weather Statement	GRB	Calumet, Manitowoc	55 min
Aug 10, 7:30 PM CDT	Special Weather Statement	GRB	Door, Marinette	60 min
Aug 10, 7:49 PM CDT	Special Marine Warning	GRB		86 min
Aug 10, 7:52 PM CDT	Severe Thunderstorm Warning	GRB	Calumet, Kewaunee, Manitowoc	38 min
Aug 10, 7:54 PM CDT	Tornado Warning	GRB	Marinette	25 min
Aug 10, 10:05 PM CDT	Areal Flood Advisory	GRB	Brown	70 min
Aug 11, 3:11 AM CDT	Small Craft Advisory	GRB		19 hr
Aug 11, 11:25 AM CDT	Special Weather Statement	GRB	Oneida	65 min
Aug 11, 11:54 AM CDT	Special Weather Statement	GRB	Lincoln, Marathon, Portage, Wood	51 min
Aug 11, 12:18 PM CDT	Severe Thunderstorm Warning	GRB	Lincoln, Marathon	42 min
Aug 11, 12:30 PM CDT	Special Weather Statement	GRB	Marathon	45 min
Aug 11, 12:38 PM CDT	Severe Thunderstorm Warning	GRB	Marathon, Portage, Wood	52 min
Aug 11, 12:42 PM CDT	Special Weather Statement	GRB	Florence, Forest	33 min
Aug 11, 12:53 PM CDT	Severe Thunderstorm Warning	GRB	Florence, Forest, Marinette	37 min
Aug 11, 12:57 PM CDT	Tornado Warning	GRB	Langlade, Lincoln, Marathon	33 min
Aug 11, 1:04 PM CDT	Tornado Warning	GRB	Marathon	41 min
Aug 11, 1:14 PM CDT	Special Weather Statement	GRB	Shawano	46 min
Aug 11, 1:20 PM CDT	Severe Thunderstorm Warning	GRB	Langlade, Lincoln, Marathon, Menominee, Shawano	40 min
Aug 11, 1:24 PM CDT	Severe Thunderstorm Warning	GRB	Marathon, Menominee, Portage, Shawano, Waupaca	51 min
Aug 11, 1:31 PM CDT	Severe Thunderstorm Warning	GRB	Oconto, Shawano, Waupaca	44 min
Aug 11, 1:40 PM CDT	Tornado Warning	GRB	Marathon	20 min
Aug 11, 1:54 PM CDT	Areal Flood Advisory	GRB	Marathon, Menominee, Shawano	3 hr
Aug 11, 1:54 PM CDT	Severe Thunderstorm Warning	GRB	Portage, Wood	51 min
Aug 11, 2:07 PM CDT	Tornado Warning	GRB	Brown, Oconto, Shawano	23 min
Aug 11, 2:09 PM CDT	Tornado Warning Tornado observed	GRB	Marathon	51 min
Aug 11, 2:16 PM CDT	Flash Flood Warning	GRB	Marathon	5 hr
Aug 11, 2:25 PM CDT	Special Marine Warning	GRB		65 min
Aug 11, 2:27 PM CDT	Severe Thunderstorm Warning	GRB	Brown, Oconto	35 min
Aug 11, 2:37 PM CDT	Areal Flood Advisory	GRB	Marinette, Oconto	2 hr
Aug 11, 2:46 PM CDT	Special Marine Warning	GRB		59 min
Aug 11, 2:47 PM CDT	Severe Thunderstorm Warning	GRB	Waushara	43 min
Aug 11, 2:47 PM CDT	Tornado Warning	GRB	Marathon	43 min
Aug 11, 2:51 PM CDT	Severe Thunderstorm Warning	GRB	Brown, Door, Kewaunee	39 min
Aug 11, 2:55 PM CDT	Areal Flood Advisory	GRB	Door	2 hr
Aug 11, 2:58 PM CDT	Special Weather Statement	GRB	Waupaca	47 min
Aug 11, 3:08 PM CDT	Severe Thunderstorm Warning	GRB	Outagamie, Shawano, Waupaca	38 min
Aug 11, 3:11 PM CDT	Special Marine Warning	GRB		64 min
Aug 11, 3:29 PM CDT	Severe Thunderstorm Warning Considerable damage threat	GRB	Waushara	18 min
Aug 11, 3:30 PM CDT	Severe Thunderstorm Warning	GRB	Brown, Door, Kewaunee, Oconto, Outagamie, Shawano	60 min
Aug 11, 3:33 PM CDT	Special Marine Warning	GRB		57 min
Aug 11, 3:51 PM CDT	Special Weather Statement	GRB	Outagamie, Winnebago	39 min
Aug 11, 4:05 PM CDT	Special Marine Warning	GRB		55 min

Nearby

Flash Flood Warnings in Wisconsin, 2021 Every 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.