Alert archive / Wisconsin / Special Weather Statements in 2026

Special Weather Statement, NWS Green Bay, WI

May 17, 2026Calumet County, Winnebago County, Wisconsin

NWS Green Bay, WI issued this special weather statement at May 17, 2026, 2:25 PM CDT for Calumet County, Winnebago County, Wisconsin. It was in force for 50 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
May 17, 2026, 2:25 PM CDT (19:25 UTC)
Expired
May 17, 2026, 3:15 PM CDT
In force
50 min
Issued by
NWS Green Bay, WI
Hail
0.25 in
Wind
40

Counties Calumet County, WI, Winnebago County, WI

The radar

The Green Bay radar (KGRB), 65 km from the middle of the area, began a volume at 19:28 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

Davenport, (KDVN), launched 12:00Z, 7.4 hours before the alert went out and 309 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, Davenport, at 12:00Z on 2026-05-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 570 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, Davenport, at 12:00Z on 2026-05-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 114 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
570 J/kg
Mixed-layer CIN
-40 J/kg
Mixed-layer LCL
716 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
114 m²/s²
0-3 km storm-relative helicity
188 m²/s²
Significant tornado parameter
0.3
Supercell composite
2.2

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 May 17, 1:06 PM CDT, 1 hour 19 minutes earlier.

Area forecast discussion, May 17, 1:06 PM CDT, 1 hour 19 minutes before
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Hazardous weather outlook, May 17, 3:08 AM CDT, 11 hours 17 minutes before
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In the hours before

Special weather statement, May 17, 1:48 PM CDT, 37 minutes before
Special Weather Statement
National Weather Service Green Bay WI
148 PM CDT Sun May 17 2026

WIZ048-049-171930-
Calumet WI-Winnebago WI-
148 PM CDT Sun May 17 2026

...A STRONG THUNDERSTORM WILL IMPACT CALUMET AND EASTERN WINNEBAGO
COUNTIES THROUGH 230 PM CDT...

At 147 PM CDT, Doppler radar was tracking a strong thunderstorm near
Southern Lake Winnebago, or near North Fond Du Lac, moving northeast
at 30 mph.

HAZARD...Wind gusts up to 40 mph and pea size hail.

SOURCE...Radar indicated.

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

This strong thunderstorm will be near...
  Central Lake Winnebago around 155 PM CDT.
  Northern Lake Winnebago around 215 PM CDT.

Other locations impacted by this storm include Brant, Quinney,
Stockbridge, Eaa, Jericho, Winnebago, Ford Festival Grounds, Black
Wolf Point, Kloten, and Brothertown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4390 8866 4423 8849 4408 8805 4394 8825
      4394 8840 4389 8840
TIME...MOT...LOC 1847Z 215DEG 24KT 4390 8850

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

Bersch
Special weather statement, May 17, 1:55 PM CDT, 30 minutes before
Special Weather Statement
National Weather Service Green Bay WI
155 PM CDT Sun May 17 2026

WIZ050-171945-
Manitowoc WI-
155 PM CDT Sun May 17 2026

...A STRONG THUNDERSTORM WILL IMPACT SOUTHWESTERN MANITOWOC COUNTY
THROUGH 245 PM CDT...

At 153 PM CDT, Doppler radar was tracking a strong thunderstorm near
Elkhart Lake, or near Plymouth, moving northeast at 35 mph.

HAZARD...Wind gusts up to 50 mph and penny size hail.

SOURCE...Radar indicated.

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

This strong thunderstorm will be near...
  Camp Rokilio Scout Camp around 205 PM CDT.
  Cleveland around 220 PM CDT.
  Manitowoc around 235 PM CDT.

Other locations impacted by this storm include Louis Corners, St
Nazianz, Kellners Corners, Clarks Mills, Kiel, Clover, Madsen,
Millhome, School Hill, and Newtonberg.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4395 8804 4418 8776 4408 8759 4390 8769
      4389 8804
TIME...MOT...LOC 1853Z 233DEG 29KT 4381 8806

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...50 MPH

Bersch
Special weather statement, May 17, 2:25 PM CDT, 0 minutes before
Special Weather Statement
National Weather Service Green Bay WI
225 PM CDT Sun May 17 2026

WIZ048-049-172015-
Calumet WI-Winnebago WI-
225 PM CDT Sun May 17 2026

...STRONG THUNDERSTORMS WILL IMPACT CALUMET AND WINNEBAGO COUNTIES
THROUGH 315 PM CDT...

At 224 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Rush Lake to near Oshkosh to near Southern
Lake Winnebago. Movement was northeast at 30 mph.

HAZARD...Wind gusts up to 40 mph and pea size hail.

SOURCE...Radar indicated.

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

Strong thunderstorms will be near...
  Oshkosh and Central Lake Winnebago around 230 PM CDT.
  Northern Lake Winnebago around 245 PM CDT.
  Chilton and High Cliff State Park around 255 PM CDT.
  Menasha around 300 PM CDT.

Other locations impacted by these storms include Killsnake Wildlife
Area, Butte Des Morts, Larsen, Lake Butte Des Morts, Jericho,
Rivermoor, Brothertown, Winneconne, Harbor Springs, and Allenville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4390 8868 4391 8871 4392 8889 4401 8889
      4424 8869 4424 8819 4403 8804 4394 8825
      4394 8840 4389 8840
TIME...MOT...LOC 1924Z 231DEG 27KT 4398 8877 4397 8863 4391 8851

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

Bersch

The office that day

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

IssuedProductOfficeCountiesLasted
May 17, 9:30 AM CDTSmall Craft AdvisoryGRB29 hr
May 17, 1:48 PM CDTSpecial Weather StatementGRBCalumet42 min
May 17, 1:55 PM CDTSpecial Weather StatementGRBManitowoc50 min
May 17, 2:10 PM CDTSpecial Marine WarningGRB95 min
May 17, 3:14 PM CDTSpecial Weather StatementGRBCalumet31 min
May 17, 3:25 PM CDTSevere Thunderstorm WarningGRBCalumet, Manitowoc50 min
May 17, 3:43 PM CDTSpecial Marine WarningGRB92 min
May 17, 3:46 PM CDTSpecial Weather StatementGRBOutagamie, Winnebago29 min
May 17, 4:31 PM CDTSpecial Weather StatementGRBBrown44 min
May 17, 5:00 PM CDTSpecial Weather StatementGRBKewaunee45 min

Nearby

Special Weather Statements in Wisconsin, 2026Every special weather statement in 2026

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.