Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 81, NWS Milwaukee, WI

September 13, 2021Dane County, Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at Sep 13, 2021, 2:45 AM CDT for Dane County, Wisconsin. It was in force for 30 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
Sep 13, 2021, 2:45 AM CDT (07:45 UTC)
Expired
Sep 13, 2021, 3:15 AM CDT
In force
30 min
Issued by
NWS Milwaukee, WI
Area
Storm-based polygon
Hail
1.0 in
Wind
50.0 mph

County Dane County, WI

The radar

The Milwaukee radar (KMKX), 60 km from the middle of the area, began a volume at 07:47 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 00:00Z, 7.8 hours before the alert went out and 179 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 00:00Z on 2021-09-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1194 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 00:00Z on 2021-09-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -7 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
1194 J/kg
Mixed-layer CIN
-314 J/kg
Mixed-layer LCL
1413 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
-7 m²/s²
0-3 km storm-relative helicity
89 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.6

Open this sounding in Storm Lab

The text

As transmitted.

467 
WUUS53 KMKX 130745
SVRMKX
WIC025-130815-
/O.NEW.KMKX.SV.W.0081.210913T0745Z-210913T0815Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Milwaukee/Sullivan WI
245 AM CDT Mon Sep 13 2021

The National Weather Service in Milwaukee/Sullivan has issued a

* Severe Thunderstorm Warning for...
  Southeastern Dane County in south central Wisconsin...

* Until 315 AM CDT.

* At 245 AM CDT, a severe thunderstorm was located near Fitchburg,
  moving east at 40 mph.

  HAZARD...Quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* Locations impacted include...
  Madison, Fitchburg, Stoughton, Oregon, McFarland, Monona, Cottage
  Grove, Deerfield, Shorewood Hills, Cambridge, Albion, Utica,
  Rockdale, Camp Randall Stadium, Henry Vilas Zoo and UW-Madison.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4286 8946 4308 8949 4313 8901 4286 8901
TIME...MOT...LOC 0745Z 264DEG 33KT 4297 8948 

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

$$

BOXELL
1 follow-up statement
111 
WWUS53 KMKX 130808
SVSMKX

Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
308 AM CDT Mon Sep 13 2021

WIC025-130818-
/O.EXP.KMKX.SV.W.0081.000000T0000Z-210913T0815Z/
Dane WI-
308 AM CDT Mon Sep 13 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN DANE COUNTY WILL
EXPIRE AT 315 AM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However small hail
is still possible with this thunderstorm.

LAT...LON 4286 8946 4308 8949 4313 8901 4286 8901
TIME...MOT...LOC 0808Z 264DEG 33KT 4299 8922 

$$

BOXELL

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 13, 1:41 AM CDTSpecial Weather StatementMKXDane, Iowa34 min
Sep 13, 1:55 AM CDTSevere Thunderstorm WarningMKXDane, Jefferson50 min
Sep 13, 2:15 AM CDTSevere Thunderstorm WarningMKXDane, Iowa45 min
Sep 13, 2:38 AM CDTSevere Thunderstorm WarningMKXJefferson, Waukesha52 min
Sep 13, 3:15 AM CDTSpecial Weather StatementMKXJefferson30 min
Sep 13, 3:29 AM CDTSpecial Weather StatementMKXWaukesha31 min
Sep 13, 3:34 AM CDTSevere Thunderstorm WarningMKXMilwaukee, Waukesha41 min
Sep 13, 3:38 AM CDTSpecial Marine WarningMKX75 min
Sep 13, 6:11 AM CDTSevere Thunderstorm WarningMKXIowa, Sauk28 min
Sep 13, 7:43 AM CDTSpecial Weather StatementMKXJefferson32 min
Sep 13, 8:21 AM CDTSpecial Weather StatementMKXMilwaukee, Ozaukee, Washington, Waukesha39 min
Sep 13, 1:13 PM CDTSmall Craft AdvisoryMKX29 hr
Sep 13, 3:51 PM CDTSpecial Weather StatementMKXDodge39 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.