Alert archive / Wisconsin / Areal Flood Advisories in 2021

Areal Flood Advisory 18, NWS Green Bay, WI

August 8, 20216 counties in Wisconsin

NWS Green Bay, WI issued this areal flood advisory at Aug 8, 2021, 2:36 AM CDT for 6 counties in Wisconsin. It was in force for 114 min.

The area

The counties it named.

The facts

Issued: Aug 8, 2021, 2:36 AM CDT (07:36 UTC)
Expired: Aug 8, 2021, 4:30 AM CDT
In force: 114 min
Issued by: NWS Green Bay, WI
Area: Storm-based polygon

Counties Brown County, WI, Door County, WI, Kewaunee County, WI, Oconto County, WI, Outagamie County, WI, Shawano County, WI

The radar

The Green Bay radar (KGRB), 19 km from the middle of the area, began a volume at 07:38 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, 7.6 hours before the alert went out and 21 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

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 7, 11:15 PM CDT, 3 hours 21 minutes earlier.

Area forecast discussion, Aug 7, 11:15 PM CDT, 3 hours 21 minutes before

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Hazardous weather outlook, Aug 7, 2:27 PM CDT, 12 hours 9 minutes before

Hazardous Weather Outlook
National Weather Service Green Bay WI
227 PM CDT Sat Aug 7 2021

WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-081930-
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-
227 PM CDT Sat Aug 7 2021

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

.DAY ONE...Tonight

Thunderstorms are possible, with a marginal risk of severe storms
over parts of central and east central Wisconsin. Torrential rain,
hail and strong winds are the main threats.

.DAYS TWO THROUGH SEVEN...Sunday through Saturday

Thunderstorms will also be possible at times Sunday through Thursday
evening as a series of upper-level disturbances and cold fronts
move through the region and interact with an unstable and moist
air mass. Some of the thunderstorms Sunday afternoon into Sunday
night may become strong or severe, especially across central and
east central Wisconsin. Hail, gusty winds and torrential downpours
are possible. If storms repeatedly move over the same area,
localized flooding will also be possible. Severe storms are also
possible Tuesday afternoon and evening, and Thursday afternoon and
evening.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated tonight, but reports of
flooding, hail or wind gusts over 40 mph would be appreciated.

LMZ521-522-541>543-081930-
The Bay of Green Bay south of a line from Cedar River MI to Rock
Island Passage-Lake Michigan from Washington Island to Sheboygan-
227 PM CDT Sat Aug 7 2021

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

.DAY ONE...Tonight

There is a chance of thunderstorms. Any storms would pose a hazard
to mariners.

.DAYS TWO THROUGH SEVEN...Sunday through Saturday

Periodic chances for thunderstorms will continue from Sunday through
Thursday evening. Any storms could pose a hazard to mariners.
Stronger storms are again possible at times from Sunday into Sunday
night, Tuesday afternoon and evening, and Thursday afternoon and
evening.

Uhlmann/Kieckbusch

In the hours before

Local storm report, Aug 7, 9:37 PM CDT, 4 hours 59 minutes before

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Special weather statement, Aug 7, 9:51 PM CDT, 4 hours 45 minutes before

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Special weather statement, Aug 7, 10:15 PM CDT, 4 hours 21 minutes before

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Local storm report, Aug 7, 10:19 PM CDT, 4 hours 17 minutes before

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Special weather statement, Aug 7, 10:43 PM CDT, 3 hours 53 minutes before

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Special weather statement, Aug 8, 1:33 AM CDT, 1 hour 3 minutes before

Special Weather Statement
National Weather Service Green Bay WI
133 AM CDT Sun Aug 8 2021

WIZ020-030-031-037-080715-
Waupaca WI-Shawano WI-Marathon WI-Menominee WI-
133 AM CDT Sun Aug 8 2021

...Thunderstorms will propduce torrential rains in east central
Marathon, southwestern Menominee, northeastern Waupaca and western
Shawano Counties through 230 AM CDT...

At 131 AM CDT, Doppler radar was tracking thunderstorms from 10
miles west of Wittenberg to Shawano...moving east at 20 mph.

HAZARD...Torrential rains of up to an inch an hour and winds of 30
         mph.

SOURCE...Radar indicated.

IMPACT...Brief flooding of urban areas and ponding of water on roads.

Locations impacted include...
Shawano, Clintonville, Wittenberg, Embarrass, Keshena, Belle Plaine,
Red River, Marion, Norrie and Pella.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

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

&&

LAT...LON 4502 8927 4484 8849 4459 8862 4459 8873
      4483 8939
TIME...MOT...LOC 0631Z 292DEG 31KT 4488 8923

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...30 MPH

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, 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, 5:03 AM CDT	Areal Flood Advisory	GRB	Calumet, Manitowoc, Portage, Waupaca, Waushara, Winnebago and 1 more	117 min
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.