Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 83, NWS Milwaukee, WI

September 13, 2021Iowa County, Sauk County, Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at Sep 13, 2021, 6:11 AM CDT for Iowa County, Sauk County, Wisconsin. It was in force for 28 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, 6:11 AM CDT (11:11 UTC)
Expired
Sep 13, 2021, 6:39 AM CDT
In force
28 min
Issued by
NWS Milwaukee, WI
Area
Storm-based polygon
Hail
1.0 in
Wind
50.0 mph

Counties Iowa County, WI, Sauk County, WI

The radar

The La Crosse radar (KARX), 104 km from the middle of the area, began a volume at 11:10 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, 11.2 hours before the alert went out and 175 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.

898 
WUUS53 KMKX 131111
SVRMKX
WIC049-111-131200-
/O.NEW.KMKX.SV.W.0083.210913T1111Z-210913T1200Z/

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

The National Weather Service in Milwaukee/Sullivan has issued a

* Severe Thunderstorm Warning for...
  Northern Iowa County in south central Wisconsin...
  Southwestern Sauk County in south central Wisconsin...

* Until 700 AM CDT.

* At 609 AM CDT, a severe thunderstorm was located near Muscoda, or
  13 miles south of Richland Center, moving east at 35 mph.

  HAZARD...Quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* Locations impacted include...
  Spring Green, Highland, Arena, Plain, Avoca, Orion and Clyde. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4320 9043 4320 9040 4321 9035 4321 9029
      4319 9028 4319 9025 4317 9020 4317 9019
      4326 9019 4330 8986 4307 8984 4305 9042
TIME...MOT...LOC 1109Z 266DEG 31KT 4315 9036 

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

$$

BOXELL
1 follow-up statement
123 
WWUS53 KMKX 131139
SVSMKX

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

WIC049-111-131149-
/O.CAN.KMKX.SV.W.0083.000000T0000Z-210913T1200Z/
Iowa WI-Sauk WI-
639 AM CDT Mon Sep 13 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN IOWA AND SOUTHWESTERN
SAUK COUNTIES IS CANCELLED...
                
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 has been cancelled.  However heavy rain is
still possible with this thunderstorm.

LAT...LON 4320 9043 4320 9040 4321 9035 4321 9029
      4319 9028 4319 9025 4317 9020 4317 9019
      4326 9019 4330 8986 4307 8984 4305 9042
TIME...MOT...LOC 1135Z 266DEG 31KT 4317 9000 

$$

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, 2:45 AM CDTSevere Thunderstorm WarningMKXDane30 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, 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.