Alert archive / Wisconsin / Areal Flood Advisories in 2021

Areal Flood Advisory 21, NWS Green Bay, WI

August 8, 20217 counties in Wisconsin

NWS Green Bay, WI issued this areal flood advisory at Aug 8, 2021, 5:03 AM CDT for 7 counties in Wisconsin. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued: Aug 8, 2021, 5:03 AM CDT (10:03 UTC)
Expired: Aug 8, 2021, 7:00 AM CDT
In force: 117 min
Issued by: NWS Green Bay, WI
Area: Storm-based polygon

Counties Calumet County, WI, Manitowoc County, WI, Portage County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI, Wood County, WI

The radar

The Green Bay radar (KGRB), 83 km from the middle of the area, began a volume at 10:03 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, 10.1 hours before the alert went out and 82 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: 22 J/kg
Mixed-layer CIN: -122 J/kg
Mixed-layer LCL: 1055 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 106 m²/s²
0-3 km storm-relative helicity: 275 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

352 
WGUS83 KGRB 081003
FLSGRB

Flood Advisory
National Weather Service Green Bay WI
503 AM CDT Sun Aug 8 2021

WIC015-071-097-135-137-139-141-081200-
/O.NEW.KGRB.FA.Y.0021.210808T1003Z-210808T1200Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Calumet WI-Manitowoc WI-Portage WI-Waupaca WI-Waushara WI-
Winnebago WI-Wood WI-
503 AM CDT Sun Aug 8 2021

The National Weather Service in Green Bay has issued a

* Urban and Small Stream Flood Advisory for...
  Southern Portage County in central Wisconsin...
  Waushara County in central Wisconsin...
  Wood County in central Wisconsin...
  Southern Calumet County in east central Wisconsin...
  Southwestern Manitowoc County in east central Wisconsin...
  Winnebago County in east central Wisconsin...
  Southwestern Waupaca County in northeastern Wisconsin...

* Until 700 AM CDT.

* At 503 AM CDT, Doppler radar indicated heavy rain due to 
  thunderstorms. This will cause urban and small stream flooding.

* Some locations that will experience flooding include...
  Oshkosh, Wisconsin Rapids, Wautoma, Chilton, Redgranite, 
  Pittsville, Plainfield, St. Nazianz, Fremont, Napowan Scout Camp, 
  Hartman Creek State Park, Chain O' Lakes-King, Lake Poygan, Rush 
  Lake, Lake Wazeecha, Central Lake Winnebago, Northern Lake 
  Winnebago, Babcock, St Anna and Camp Rokilio Scout Camp.

Additional rainfall amounts of 0.5 to 1.5 inches are expected over 
the area. This additional rain will result in minor flooding.

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.

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 4462 9032 4398 8778 4389 8785 4389 8816
      4394 8816 4394 8840 4389 8840 4390 8889
      4398 8889 4398 8960 4425 8960 4425 9032

$$

RDM

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 7, 7:21 PM CDT	Special Weather Statement	GRB	Portage, Wood	39 min
Aug 7, 7:46 PM CDT	Areal Flood Advisory	GRB	Waushara	3 hr
Aug 7, 8:00 PM CDT	Special Weather Statement	GRB	Portage, Waupaca, Waushara	60 min
Aug 7, 8:13 PM CDT	Areal Flood Advisory	GRB	Portage, Waupaca, Waushara, Wood	3 hr
Aug 7, 8:59 PM CDT	Special Weather Statement	GRB	Waushara, Winnebago	61 min
Aug 7, 9:51 PM CDT	Special Weather Statement	GRB	Calumet, Winnebago	24 min
Aug 7, 10:15 PM CDT	Special Weather Statement	GRB	Calumet	30 min
Aug 7, 10:43 PM CDT	Special Weather Statement	GRB	Calumet	47 min
Aug 8, 1:33 AM CDT	Special Weather Statement	GRB	Shawano	42 min
Aug 8, 2:36 AM CDT	Areal Flood Advisory	GRB	Brown, Door, Kewaunee, Oconto, Outagamie, Shawano	114 min
Aug 8, 3:43 AM CDT	Areal Flood Advisory	GRB	Brown, Calumet, Manitowoc, Outagamie, Waupaca, Winnebago	2 hr
Aug 8, 4:35 AM CDT	Areal Flood Advisory	GRB	Brown, Door, Kewaunee, Manitowoc, Oconto, Outagamie and 1 more	3 hr
Aug 8, 5:23 AM CDT	Special Weather Statement	GRB	Wood	52 min
Aug 8, 5:37 AM CDT	Special Weather Statement	GRB	Marathon, Portage, Wood	38 min
Aug 8, 5:56 AM CDT	Areal Flood Advisory	GRB	Brown, Calumet, Kewaunee, Manitowoc, Outagamie, Waupaca and 1 more	2 hr
Aug 8, 10:38 AM CDT	Small Craft Advisory	GRB		11 hr
Aug 8, 3:13 PM CDT	Special Weather Statement	GRB	Waushara, Wood	77 min
Aug 8, 3:54 PM CDT	Severe Thunderstorm Warning	GRB	Waushara	51 min
Aug 8, 4:16 PM CDT	Severe Thunderstorm Warning	GRB	Waushara, Winnebago	29 min
Aug 8, 4:30 PM CDT	Special Weather Statement	GRB	Calumet, Winnebago	30 min
Aug 8, 4:30 PM CDT	Severe Thunderstorm Warning	GRB	Outagamie, Portage, Shawano, Waupaca, Waushara, Winnebago	60 min
Aug 8, 4:46 PM CDT	Severe Thunderstorm Warning	GRB	Waushara, Winnebago	29 min
Aug 8, 5:10 PM CDT	Special Weather Statement	GRB	Brown	35 min
Aug 8, 5:27 PM CDT	Special Weather Statement	GRB	Brown, Outagamie	48 min
Aug 8, 5:41 PM CDT	Special Weather Statement	GRB	Calumet, Manitowoc	49 min
Aug 8, 6:19 PM CDT	Special Marine Warning	GRB		56 min
Aug 8, 6:22 PM CDT	Special Marine Warning	GRB		66 min
Aug 8, 6:31 PM CDT	Areal Flood Advisory	GRB	Brown, Kewaunee	62 min
Aug 8, 6:31 PM CDT	Special Weather Statement	GRB	Kewaunee, Manitowoc	44 min
Aug 8, 6:46 PM CDT	Severe Thunderstorm Warning	GRB	Brown, Door, Kewaunee	29 min

Nearby

Areal Flood Advisories in Wisconsin, 2021 Every areal flood advisory 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.