Alert archive / Wisconsin / Areal Flood Advisories in 2021

Areal Flood Advisory 33, NWS Green Bay, WI

August 28, 2021Brown County, Calumet County, Manitowoc County, Wisconsin

NWS Green Bay, WI issued this areal flood advisory at Aug 28, 2021, 1:38 AM CDT for Brown County, Calumet County, Manitowoc County, Wisconsin. It was in force for 82 min.

The area

The counties it named.

The facts

Issued: Aug 28, 2021, 1:38 AM CDT (06:38 UTC)
Expired: Aug 28, 2021, 3:00 AM CDT
In force: 82 min
Issued by: NWS Green Bay, WI
Area: Storm-based polygon

Counties Brown County, WI, Calumet County, WI, Manitowoc County, WI

The radar

The Green Bay radar (KGRB), 33 km from the middle of the area, began a volume at 06:37 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, 6.6 hours before the alert went out and 31 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

What forecasters said that day

The local office's own words before this areal flood advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Green Bay, WI wrote its last area forecast discussion before this areal flood advisory went out at Aug 28, 12:48 AM CDT, 50 minutes earlier.

Area forecast discussion, Aug 28, 12:48 AM CDT, 50 minutes before

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Hazardous weather outlook, Aug 27, 2:43 PM CDT, 10 hours 55 minutes before

Hazardous Weather Outlook...CORRECTED
National Weather Service Green Bay WI
243 PM CDT Fri Aug 27 2021

WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-281945-
Vilas-Oneida-Forest-Florence-Northern Marinette County-Lincoln-
Langlade-Menominee-Northern Oconto County-Door-Marathon-Shawano-
Wood-Portage-Waupaca-Outagamie-Brown-Kewaunee-Waushara-Winnebago-
Calumet-Manitowoc-Southern Marinette County-
Southern Oconto County-
243 PM CDT Fri Aug 27 2021

This Hazardous Weather Outlook is for north-central and northeast
Wisconsin.

.DAY ONE...Rest of the Afternoon and Tonight

Thunderstorms are expected across the area through tonight. Some
of the thunderstorms could become severe with damaging winds and
large hail. Torrential rainfall is also expected which may lead
to localized flooding, especially in urban areas and locations
that received heavy rainfall last night.

.DAYS TWO THROUGH SEVEN...Saturday through Friday

Thunderstorms are possible at times this weekend. Scattered strong
to severe thunderstorms are possible Saturday afternoon and evening,
especially over north central and far northeast Wisconsin, and on
Sunday afternoon in northeast and east central Wisconsin. The
main threats would be heavy rainfall, damaging winds, and hail.

The combination of the heat and humidity will cause the heat index
values to climb into the middle 90s to around 100F Saturday
afternoon into early Saturday evening.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed tonight, and Saturday afternoon
and Saturday night. Spotters are requested to report rainfall
reports over one inch, large hail or damaging winds.

LMZ521-522-541>543-281945-
The Bay of Green Bay south of a line from Cedar River MI to Rock
Island Passage-Lake Michigan from Washington Island to Sheboygan-
243 PM CDT Fri Aug 27 2021

This Hazardous Weather Outlook is for portions of northwest Lake
Michigan and the waters of Green Bay.

.DAY ONE...Rest of the Afternoon and Tonight

Thunderstorms are expected through tonight. The thunderstorms
will pose a hazard to mariners, with gusty winds, hail and poor
visibilities in torrential rainfall.

.DAYS TWO THROUGH SEVEN...Saturday through Friday

Thunderstorms are possible at times this weekend. Any thunderstorms
will pose a hazard to mariners.

Dense marine fog may occur on Lake Michigan at times this weekend.

Eckberg/Kieckbusch

In the hours before

Special weather statement, Aug 27, 11:32 PM CDT, 2 hours 6 minutes before

Special Weather Statement
National Weather Service Green Bay WI
1132 PM CDT Fri Aug 27 2021

WIZ021-031-037>039-045-048-073-074-280530-
Southern Oconto County WI-Waupaca WI-Southern Marinette County WI-
Shawano WI-Outagamie WI-Winnebago WI-Northern Oconto County WI-
Waushara WI-Brown WI-
1132 PM CDT Fri Aug 27 2021

...Strong thunderstorms will impact portions of northwestern Brown,
southern Marinette, northwestern Winnebago, eastern Waushara,
southern Waupaca, southern Oconto, northwestern Outagamie and eastern
Shawano Counties through 1230 AM CDT...

At 1131 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 6 miles northwest of Gillett to Navarino
Wildlife Area to near New London to near Waupaca to near Napowan
Scout Camp. Movement was east at 25 mph.

HAZARD...Winds in excess of 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Waupaca, Wautoma, New London, Oconto, Pulaski, Gillett, Fremont,
Pound, Napowan Scout Camp and Lake Poygan.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with these storms and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 4404 8931 4436 8917 4434 8883 4462 8858
      4485 8851 4486 8849 4497 8847 4525 8771
      4520 8774 4517 8773 4482 8784 4455 8809
      4456 8844 4418 8860
TIME...MOT...LOC 0431Z 248DEG 22KT 4493 8842 4464 8852 4436 8876 4438
8910 4414 8921

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

Kurimski

Local storm report, Aug 27, 11:36 PM CDT, 2 hours 2 minutes before

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Local storm report, Aug 28, 12:08 AM CDT, 1 hour 30 minutes before

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Local storm report, Aug 28, 12:15 AM CDT, 1 hour 23 minutes before

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Local storm report, Aug 28, 12:25 AM CDT, 1 hour 13 minutes before

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Local storm report, Aug 28, 1:17 AM CDT, 21 minutes before

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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, 10:58 PM CDT	Flash Flood Warning	GRB	Portage, Wood	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, 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

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.