Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 35, NWS Milwaukee, WI

August 7, 20214 counties in Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at Aug 7, 2021, 5:17 PM CDT for 4 counties in Wisconsin. It was in force for 58 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Aug 7, 2021, 5:17 PM CDT (22:17 UTC)
Expired
Aug 7, 2021, 6:15 PM CDT
In force
58 min
Issued by
NWS Milwaukee, WI
Area
Storm-based polygon
Tornado
Possible
Hail
0.75 in
Wind
60.0 mph

Counties Columbia County, WI, Green Lake County, WI, Marquette County, WI, Sauk County, WI

The radar

The Milwaukee radar (KMKX), 93 km from the middle of the area, began a volume at 22:15 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.

What was reported inside it

TimeReportWhereRemark
Aug 7, 5:50 PM CDTTSTM WND GST 504 Sw Kingston, WICORRECTS PREVIOUS TSTM WND GST REPORT FROM 4 SW KINGSTON. DALTON.
Aug 7, 5:50 PM CDTTSTM WND GST 604 Sw Kingston, WIDALTON.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Aug 7, 4:36 PM CDTSevere Thunderstorm WatchSPC4 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 10.3 hours before the alert went out and 140 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 2021-08-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 20 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 2021-08-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 72 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
20 J/kg
Mixed-layer CIN
-32 J/kg
Mixed-layer LCL
656 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
72 m²/s²
0-3 km storm-relative helicity
103 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

299 
WUUS53 KMKX 072217
SVRMKX
WIC021-047-077-111-072315-
/O.NEW.KMKX.SV.W.0035.210807T2217Z-210807T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Milwaukee/Sullivan WI
517 PM CDT Sat Aug 7 2021

The National Weather Service in Milwaukee/Sullivan has issued a

* Severe Thunderstorm Warning for...
  Southwestern Green Lake County in south central Wisconsin...
  Columbia County in south central Wisconsin...
  Southern Marquette County in south central Wisconsin...
  East central Sauk County in south central Wisconsin...

* Until 615 PM CDT.

* At 517 PM CDT, severe thunderstorms were located along a line
  extending from 9 miles northeast of Wisconsin Dells to 6 miles
  northwest of Portage to near Lake Wisconsin, moving east at 30 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Portage, Columbus, Lake Wisconsin, Poynette, Pardeeville, Randolph,
  Fall River, Montello, Rio, Cambria, Packwaukee, Manchester,
  Arlington, Wyocena, Mecan, Otsego, Oxford, Endeavor, Friesland and
  Kingston.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4382 8901 4328 8901 4328 8920 4339 8962
      4364 8964 4364 8960 4380 8960
TIME...MOT...LOC 2217Z 283DEG 27KT 4372 8964 4362 8954 4345 8953 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

HANSEN
2 follow-up statements
342 
WWUS53 KMKX 072239
SVSMKX

Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
539 PM CDT Sat Aug 7 2021

WIC111-072248-
/O.CAN.KMKX.SV.W.0035.000000T0000Z-210807T2315Z/
Sauk WI-
539 PM CDT Sat Aug 7 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL SAUK COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 900 PM CDT for
south central Wisconsin.

LAT...LON 4382 8901 4328 8901 4328 8920 4338 8960
      4380 8960
TIME...MOT...LOC 2238Z 283DEG 27KT 4369 8944 4359 8934 4342 8933 

$$

WIC021-047-077-072315-
/O.CON.KMKX.SV.W.0035.000000T0000Z-210807T2315Z/
Green Lake WI-Columbia WI-Marquette WI-
539 PM CDT Sat Aug 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM CDT
FOR SOUTHWESTERN GREEN LAKE...COLUMBIA AND SOUTHERN MARQUETTE
COUNTIES...

At 538 PM CDT, severe thunderstorms were located along a line
extending from 9 miles southwest of Montello to near Pardeeville to
near Poynette, moving east at 30 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Portage, Columbus, Lake Wisconsin, Poynette, Pardeeville, Randolph,
Fall River, Montello, Rio, Cambria, Packwaukee, Manchester,
Arlington, Wyocena, Mecan, Otsego, Oxford, Endeavor, Friesland and
Kingston.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4382 8901 4328 8901 4328 8920 4338 8960
      4380 8960
TIME...MOT...LOC 2238Z 283DEG 27KT 4369 8944 4359 8934 4342 8933 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

HANSEN
383 
WWUS53 KMKX 072254
SVSMKX

Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
554 PM CDT Sat Aug 7 2021

WIC021-047-077-072315-
/O.CON.KMKX.SV.W.0035.000000T0000Z-210807T2315Z/
Green Lake WI-Columbia WI-Marquette WI-
554 PM CDT Sat Aug 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM CDT
FOR SOUTHWESTERN GREEN LAKE...EASTERN COLUMBIA AND SOUTHEASTERN
MARQUETTE COUNTIES...

At 553 PM CDT, severe thunderstorms were located along a line
extending from 9 miles south of Montello to near Cambria to near Rio,
moving east at 30 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Columbus, Pardeeville, Randolph, Fall River, Montello, Rio, Cambria,
Manchester, Wyocena, Mecan, Otsego, Friesland, Kingston, Doylestown,
Marquette, Glen Oak and Dalton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4382 8901 4328 8901 4328 8920 4332 8934
      4378 8943
TIME...MOT...LOC 2253Z 283DEG 27KT 4367 8930 4357 8920 4340 8919 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

HANSEN

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 6, 7:34 PM CDTAreal Flood AdvisoryMKXMilwaukee, Waukesha119 min
Aug 6, 7:38 PM CDTSevere Thunderstorm WarningMKXJefferson37 min
Aug 6, 7:55 PM CDTSpecial Marine WarningMKX50 min
Aug 6, 7:57 PM CDTSpecial Weather StatementMKXKenosha, Racine, Walworth63 min
Aug 6, 8:00 PM CDTAreal Flood AdvisoryMKXJefferson, Rock, Walworth2 hr
Aug 6, 8:14 PM CDTSevere Thunderstorm WarningMKXRock, Walworth31 min
Aug 6, 8:51 PM CDTSpecial Weather StatementMKXRock, Walworth54 min
Aug 6, 9:45 PM CDTSevere Thunderstorm WarningMKXDane30 min
Aug 6, 10:15 PM CDTSpecial Weather StatementMKXDane30 min
Aug 7, 10:06 AM CDTSpecial Weather StatementMKXColumbia, Marquette54 min
Aug 7, 11:01 AM CDTSpecial Weather StatementMKXColumbia, Green Lake59 min
Aug 7, 11:47 AM CDTSpecial Weather StatementMKXDodge, Jefferson58 min
Aug 7, 12:32 PM CDTSevere Thunderstorm WarningMKXJefferson43 min
Aug 7, 12:54 PM CDTSevere Thunderstorm WarningMKXJefferson, Waukesha45 min
Aug 7, 1:48 PM CDTSevere Thunderstorm WarningMKXSauk42 min
Aug 7, 3:53 PM CDTSevere Thunderstorm Warning Considerable damage threatMKXSauk52 min
Aug 7, 4:33 PM CDTSevere Thunderstorm Warning Considerable damage threatMKXColumbia, Dane, Iowa, Sauk57 min
Aug 7, 4:38 PM CDTTornado Warning Tornado observedMKXIowa67 min
Aug 7, 5:26 PM CDTTornado WarningMKXColumbia39 min
Aug 7, 5:31 PM CDTSevere Thunderstorm WarningMKXColumbia, Dane59 min
Aug 7, 5:33 PM CDTTornado WarningMKXIowa57 min
Aug 7, 6:03 PM CDTSpecial Weather StatementMKXDodge, Fond du Lac, Green Lake42 min
Aug 7, 6:09 PM CDTSevere Thunderstorm WarningMKXDane66 min
Aug 7, 6:25 PM CDTSevere Thunderstorm WarningMKXDane50 min
Aug 7, 6:40 PM CDTSpecial Weather StatementMKXJefferson50 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2021Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.