Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 70, NWS Milwaukee, WI

September 7, 2021Green County, Rock County, Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at Sep 7, 2021, 11:11 AM CDT for Green County, Rock County, Wisconsin. It was in force for 34 min. 1 report 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
Sep 7, 2021, 11:11 AM CDT (16:11 UTC)
Expired
Sep 7, 2021, 11:45 AM CDT
In force
34 min
Issued by
NWS Milwaukee, WI
Area
Storm-based polygon
Hail
1.0 in
Wind
50.0 mph

Counties Green County, WI, Rock County, WI

The radar

The Milwaukee radar (KMKX), 68 km from the middle of the area, began a volume at 16:11 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
Sep 7, 11:35 AM CDTHAIL 1Edgerton, WI

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

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 4.2 hours before the alert went out and 163 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 2021-09-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 827 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 2021-09-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 185 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
827 J/kg
Mixed-layer CIN
-263 J/kg
Mixed-layer LCL
1475 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
185 m²/s²
0-3 km storm-relative helicity
167 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

As transmitted.

080 
WUUS53 KMKX 071611
SVRMKX
WIC045-105-071645-
/O.NEW.KMKX.SV.W.0070.210907T1611Z-210907T1645Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Milwaukee/Sullivan WI
1111 AM CDT Tue Sep 7 2021

The National Weather Service in Milwaukee/Sullivan has issued a

* Severe Thunderstorm Warning for...
  Northeastern Green County in south central Wisconsin...
  Northwestern Rock County in south central Wisconsin...

* Until 1145 AM CDT.

* At 1110 AM CDT, a severe thunderstorm was located over Belleville,
  or 8 miles southwest of Oregon, moving east at 45 mph.

  HAZARD...Quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* This severe thunderstorm will be near...
  Brooklyn around 1120 AM CDT.
  Evansville around 1125 AM CDT.
  Edgerton around 1135 AM CDT.

Other locations impacted by this severe thunderstorm include Fulton,
Cooksville, Indianford, Attica and Dayton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4277 8958 4286 8957 4286 8937 4285 8937
      4285 8901 4276 8901
TIME...MOT...LOC 1610Z 271DEG 49KT 4284 8950 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH

$$

GEHRING

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 6, 9:06 PM CDTSmall Craft AdvisoryMKX45 hr
Sep 7, 2:21 AM CDTGale WarningMKX13 hr
Sep 7, 8:41 AM CDTSpecial Weather StatementMKXMarquette49 min
Sep 7, 8:57 AM CDTSevere Thunderstorm WarningMKXGreen Lake, Marquette48 min
Sep 7, 9:34 AM CDTSevere Thunderstorm WarningMKXFond du Lac56 min
Sep 7, 10:10 AM CDTSevere Thunderstorm WarningMKXFond du Lac50 min
Sep 7, 10:27 AM CDTSevere Thunderstorm WarningMKXFond du Lac, Sheboygan78 min
Sep 7, 10:40 AM CDTSpecial Weather StatementMKXColumbia, Dane, Dodge, Iowa65 min
Sep 7, 10:57 AM CDTSpecial Marine WarningMKX63 min
Sep 7, 11:01 AM CDTSevere Thunderstorm WarningMKXColumbia, Dane, Dodge, Jefferson59 min
Sep 7, 11:04 AM CDTSevere Thunderstorm WarningMKXDodge, Fond du Lac, Ozaukee, Sheboygan, Washington56 min
Sep 7, 11:22 AM CDTSpecial Marine WarningMKX53 min
Sep 7, 11:27 AM CDTSevere Thunderstorm WarningMKXMilwaukee, Ozaukee, Washington, Waukesha48 min
Sep 7, 11:31 AM CDTSpecial Marine WarningMKX89 min
Sep 7, 11:42 AM CDTSevere Thunderstorm WarningMKXRock, Walworth48 min
Sep 7, 11:45 AM CDTSevere Thunderstorm WarningMKXJefferson, Milwaukee, Waukesha60 min
Sep 7, 12:18 PM CDTSpecial Marine WarningMKX87 min
Sep 7, 12:19 PM CDTSevere Thunderstorm WarningMKXRacine, Walworth40 min
Sep 7, 12:30 PM CDTSevere Thunderstorm WarningMKXKenosha, Racine, Rock, Walworth60 min
Sep 7, 12:47 PM CDTSpecial Weather StatementMKXMilwaukee28 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.