Alert archive / Wisconsin / Special Weather Statements in 2021

Special Weather Statement, NWS Green Bay, WI

August 28, 2021Manitowoc County, Wisconsin

NWS Green Bay, WI issued this special weather statement at Aug 28, 2021, 5:17 PM CDT for Manitowoc County, Wisconsin. It was in force for 58 min. 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 28, 2021, 5:17 PM CDT (22:17 UTC)
Expired
Aug 28, 2021, 6:15 PM CDT
In force
58 min
Issued by
NWS Green Bay, WI
Hail
0.25 in
Wind
40

County Manitowoc County, WI

The radar

The Green Bay radar (KGRB), 58 km from the middle of the area, began a volume at 22:18 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, 10.3 hours before the alert went out and 56 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-pSkew-T log-p diagram, Green Bay/Straub, WI at 12:00Z on 2021-08-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 77 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Green Bay/Straub, WI at 12:00Z on 2021-08-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -52 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
77 J/kg
Mixed-layer CIN
-199 J/kg
Mixed-layer LCL
1310 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
-52 m²/s²
0-3 km storm-relative helicity
-51 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Aug 28, 2:32 PM CDT, 2 hours 45 minutes earlier.

Area forecast discussion, Aug 28, 2:32 PM CDT, 2 hours 45 minutes before
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Hazardous weather outlook, Aug 28, 2:10 PM CDT, 3 hours 7 minutes before
Hazardous Weather Outlook
National Weather Service Green Bay WI
210 PM CDT Sat Aug 28 2021

WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-291915-
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-
210 PM CDT Sat Aug 28 2021

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

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

Thunderstorms are possible through late tonight. Scattered strong
to severe thunderstorms are possible, especially over north-
central, central and far northeast Wisconsin. The main threats
would be damaging winds, heavy rainfall and hail. The greatest
risk for severe weather will be late this afternoon into early
Sunday morning.

.DAYS TWO THROUGH SEVEN...Sunday through Saturday

Thunderstorms are possible on Sunday. A few stronger storms are
possible across east-central Wisconsin from late morning through
mid afternoon on Sunday. Strong winds and hail will be the
possible with the stronger storms.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed through late tonight. Spotters
are requested to report rainfall reports over one inch, large hail
and damaging winds.

LMZ521-522-541>543-291915-
The Bay of Green Bay south of a line from Cedar River MI to Rock
Island Passage-Lake Michigan from Washington Island to Sheboygan-
210 PM CDT Sat Aug 28 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 possible through tonight. Any thunderstorms
will pose a hazard to mariners.

.DAYS TWO THROUGH SEVEN...Sunday through Saturday

Increasing southwesterly winds and building waves will cause
hazardous conditions for small craft on Sunday.

Thunderstorms are possible late Sunday morning and afternoon.
Some of the storms could contain hail and strong winds.

Eckberg/Skowronski

In the hours before

Local storm report, Aug 28, 12:49 PM CDT, 4 hours 28 minutes before
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Special weather statement, Aug 28, 5:17 PM CDT, 0 minutes before
Special Weather Statement
National Weather Service Green Bay WI
517 PM CDT Sat Aug 28 2021

WIZ049-050-282315-
Calumet WI-Manitowoc WI-
517 PM CDT Sat Aug 28 2021

...A strong thunderstorm will impact portions of southeastern Calumet
and Manitowoc Counties through 615 PM CDT...

At 517 PM CDT, Doppler radar was tracking a strong thunderstorm over
St Anna, or 13 miles northwest of Plymouth, moving northeast at 35
mph.

HAZARD...Winds in excess of 40 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

This strong thunderstorm will be near...
  Camp Rokilio Scout Camp around 530 PM CDT.

Other locations in the path of this storm include St. Nazianz,
Valders, Manitowoc and Two Creeks.

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 4394 8816 4394 8827 4432 8752 4415 8750
      4407 8759 4390 8768 4389 8773 4389 8816
TIME...MOT...LOC 2217Z 235DEG 31KT 4391 8813

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH

Kallas

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 27, 7:25 PM CDTAreal Flood AdvisoryGRBOutagamie, Portage, Shawano, Waupaca2 hr
Aug 27, 7:52 PM CDTSpecial Marine WarningGRB68 min
Aug 27, 7:55 PM CDTSevere Thunderstorm WarningGRBBrown, Oconto, Outagamie, Shawano65 min
Aug 27, 8:35 PM CDTSpecial Weather StatementGRBKewaunee40 min
Aug 27, 9:08 PM CDTSpecial Weather StatementGRBCalumet, Winnebago52 min
Aug 27, 9:53 PM CDTAreal Flood AdvisoryGRBMarathon, Portage, Waushara, Wood3 hr
Aug 27, 9:59 PM CDTSpecial Weather StatementGRBCalumet, Manitowoc61 min
Aug 27, 10:36 PM CDTAreal Flood AdvisoryGRBCalumet, Manitowoc3 hr
Aug 27, 10:39 PM CDTAreal Flood AdvisoryGRBOutagamie, Shawano, Waupaca, Winnebago3 hr
Aug 27, 10:58 PM CDTFlash Flood WarningGRBPortage, Wood3 hr
Aug 27, 11:32 PM CDTSpecial Weather StatementGRBOconto, Waushara58 min
Aug 27, 11:51 PM CDTFlash Flood WarningGRBWaupaca3 hr
Aug 28, 12:34 AM CDTFlash Flood WarningGRBBrown, Outagamie84 min
Aug 28, 1:38 AM CDTAreal Flood AdvisoryGRBBrown, Calumet, Manitowoc82 min
Aug 28, 7:41 AM CDTRiver Flood WarningGRBWood21 days
Aug 28, 10:14 AM CDTBeach Hazards StatementGRBDoor33 hr
Aug 28, 10:14 AM CDTSmall Craft AdvisoryGRB33 hr
Aug 28, 10:36 AM CDTRiver Flood WarningGRBWood48 hr

Nearby

Special Weather Statements in Wisconsin, 2021Every special weather statement 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.