Alert archive / Wisconsin / Flash Flood Warnings in 2021

Flash Flood Warning 6, NWS Green Bay, WI

August 27, 2021Portage County, Wood County, Wisconsin

NWS Green Bay, WI issued this flash flood warning at Aug 27, 2021, 10:58 PM CDT for Portage County, Wood County, Wisconsin. It was in force for 3 hr. 3 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: Aug 27, 2021, 10:58 PM CDT (03:58 UTC)
Expired: Aug 28, 2021, 2:00 AM CDT
In force: 3 hr
Issued by: NWS Green Bay, WI
Area: Storm-based polygon
Flood severity: None

Counties Portage County, WI, Wood County, WI

The radar

The Green Bay radar (KGRB), 123 km from the middle of the area, began a volume at 03:57 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
Aug 27, 11:01 PM CDT	HEAVY RAIN 3.6	2 Se Polonia, WI	RUNNING TOTAL SINCE MIDNIGHT. REPORT VIA SOCIAL MEDIA.
Aug 27, 11:30 PM CDT	FLASH FLOOD	Stevens Point, WI	MULTIPLE STREETS BARRICADED DUE TO FLOODING ALL OVER THE COUNTY.
Aug 27, 11:59 PM CDT	HEAVY RAIN 5.49	1 S Plover, WI	DAILY TOTAL.

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, 4.0 hours before the alert went out and 124 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: 552 J/kg
Mixed-layer CIN: -77 J/kg
Mixed-layer LCL: 916 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 179 m²/s²
0-3 km storm-relative helicity: 278 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 1.6

Open this sounding in Storm Lab

The text

As transmitted.

129 
WGUS53 KGRB 280358
FFWGRB
WIC097-141-280700-
/O.NEW.KGRB.FF.W.0006.210828T0358Z-210828T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Green Bay WI
1058 PM CDT Fri Aug 27 2021

The National Weather Service in Green Bay has issued a

* Flash Flood Warning for...
  Portage County in central Wisconsin...
  Wood County in central Wisconsin...

* Until 200 AM CDT.

* At 1058 PM CDT, local law enforcement reported thunderstorms 
  producing heavy rain in Marshfield. Between 1 and 2 inches of rain 
  have fallen. The expected rainfall rate is 2 inches in 1 hour. 
  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...
  Stevens Point, Wisconsin Rapids, Marshfield, Whiting, Amherst, 
  Pittsville, Lake Wazeecha, Babcock, Plover, Stockton, Nekoosa, 
  Port Edwards, Biron, Hewitt, Sherry, Auburndale, Jordan, Vesper, 
  Rosholt and Park Ridge.

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 4468 8922 4424 8922 4425 9032 4469 9032

FLASH FLOOD...OBSERVED
EXPECTED RAINFALL...2 INCHES IN 1 HOUR

$$

Kurimski

2 follow-up statements

078 
WGUS73 KGRB 280506
FFSGRB

Flash Flood Statement
National Weather Service Green Bay WI
1206 AM CDT Sat Aug 28 2021

WIC097-141-280700-
/O.CON.KGRB.FF.W.0006.000000T0000Z-210828T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Portage WI-Wood WI-
1206 AM CDT Sat Aug 28 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 2 AM CDT EARLY THIS 
MORNING FOR PORTAGE AND WOOD COUNTIES...

At 1206 AM CDT, local law enforcement reported flash flooding in 
Marshfield, Stevens Point, and Plover. Between 3 and 5 inches of 
rain have fallen. Even though the heavy rain has ended, flash 
flooding is still 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...
  Stevens Point, Wisconsin Rapids, Marshfield, Whiting, Amherst, 
  Pittsville, Lake Wazeecha, Babcock, Plover, Stockton, Nekoosa, 
  Port Edwards, Biron, Hewitt, Sherry, Auburndale, Jordan, Vesper, 
  Rosholt and Park Ridge.

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 4468 8922 4424 8922 4425 9032 4469 9032

FLASH FLOOD...OBSERVED

$$

Kurimski

200 
WGUS73 KGRB 280651
FFSGRB

Flash Flood Statement
National Weather Service Green Bay WI
151 AM CDT Sat Aug 28 2021

WIC097-141-280701-
/O.EXP.KGRB.FF.W.0006.000000T0000Z-210828T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Portage WI-Wood WI-
151 AM CDT Sat Aug 28 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 2 AM CDT EARLY THIS MORNING 
FOR PORTAGE AND WOOD COUNTIES...

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

LAT...LON 4468 8922 4424 8922 4425 9032 4469 9032

$$

Kurimski

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 27, 7:25 PM CDT	Areal Flood Advisory	GRB	Outagamie, Portage, Shawano, Waupaca	2 hr
Aug 27, 7:52 PM CDT	Special Marine Warning	GRB		68 min
Aug 27, 7:55 PM CDT	Severe Thunderstorm Warning	GRB	Brown, Oconto, Outagamie, Shawano	65 min
Aug 27, 8:35 PM CDT	Special Weather Statement	GRB	Kewaunee	40 min
Aug 27, 9:08 PM CDT	Special Weather Statement	GRB	Calumet, Winnebago	52 min
Aug 27, 9:53 PM CDT	Areal Flood Advisory	GRB	Marathon, Portage, Waushara, Wood	3 hr
Aug 27, 9:59 PM CDT	Special Weather Statement	GRB	Calumet, Manitowoc	61 min
Aug 27, 10:36 PM CDT	Areal Flood Advisory	GRB	Calumet, Manitowoc	3 hr
Aug 27, 10:39 PM CDT	Areal Flood Advisory	GRB	Outagamie, Shawano, Waupaca, Winnebago	3 hr
Aug 27, 11:32 PM CDT	Special Weather Statement	GRB	Oconto, Waushara	58 min
Aug 27, 11:51 PM CDT	Flash Flood Warning	GRB	Waupaca	3 hr
Aug 28, 12:34 AM CDT	Flash Flood Warning	GRB	Brown, Outagamie	84 min
Aug 28, 1:38 AM CDT	Areal Flood Advisory	GRB	Brown, Calumet, Manitowoc	82 min
Aug 28, 7:41 AM CDT	River Flood Warning	GRB	Wood	21 days
Aug 28, 10:14 AM CDT	Beach Hazards Statement	GRB	Door	33 hr
Aug 28, 10:14 AM CDT	Small Craft Advisory	GRB		33 hr
Aug 28, 10:36 AM CDT	River Flood Warning	GRB	Wood	48 hr
Aug 28, 5:17 PM CDT	Special Weather Statement	GRB	Manitowoc	58 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.