Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 52, NWS Milwaukee, WI

August 11, 2021Iowa County, Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at Aug 11, 2021, 4:22 PM CDT for Iowa County, Wisconsin. It was in force for 53 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: Aug 11, 2021, 4:22 PM CDT (21:22 UTC)
Expired: Aug 11, 2021, 5:15 PM CDT
In force: 53 min
Issued by: NWS Milwaukee, WI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Iowa County, WI

The radar

The La Crosse radar (KARX), 117 km from the middle of the area, began a volume at 21:24 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 watch it was issued in

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

Issued	Product	Office	Lasted
Aug 11, 12:17 PM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 9.4 hours before the alert went out and 167 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2852 J/kg
Mixed-layer CIN: -107 J/kg
Mixed-layer LCL: 1040 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 170 m²/s²
0-3 km storm-relative helicity: 193 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.7

Open this sounding in Storm Lab

The text

As transmitted.

755 
WUUS53 KMKX 112122
SVRMKX
WIC049-112215-
/O.NEW.KMKX.SV.W.0052.210811T2122Z-210811T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Milwaukee/Sullivan WI
422 PM CDT Wed Aug 11 2021

The National Weather Service in Milwaukee/Sullivan has issued a

* Severe Thunderstorm Warning for...
  Central Iowa County in south central Wisconsin...

* Until 515 PM CDT.

* At 422 PM CDT, a severe thunderstorm was located 9 miles south of
  Muscoda, or 18 miles west of Dodgeville, moving east at 35 mph.

  HAZARD...Quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* Locations impacted include...
  Dodgeville, Highland, Centerville, Cobb, Clyde, Blackhawk Lake Rec
  Area, Governor Dodge St Park and Edmund.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 800 PM CDT for south central
Wisconsin.

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

&&

LAT...LON 4316 9009 4315 9005 4317 9005 4317 9001
      4290 9001 4295 9043 4312 9043
TIME...MOT...LOC 2122Z 267DEG 29KT 4305 9047 

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

$$

CMILLER

1 follow-up statement

230 
WWUS53 KMKX 112145
SVSMKX

Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
445 PM CDT Wed Aug 11 2021

WIC049-112215-
/O.CON.KMKX.SV.W.0052.000000T0000Z-210811T2215Z/
Iowa WI-
445 PM CDT Wed Aug 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM CDT
FOR CENTRAL IOWA COUNTY...

At 445 PM CDT, a severe thunderstorm was located 7 miles northwest of
Dodgeville, moving east at 35 mph.

HAZARD...Quarter size hail.

SOURCE...Radar indicated.

IMPACT...Damage to vehicles is expected.

Locations impacted include...
Dodgeville, Highland, Centerville, Cobb, Clyde, Blackhawk Lake Rec
Area, Governor Dodge St Park and Edmund.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 800 PM CDT for south central
Wisconsin.

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

&&

LAT...LON 4316 9009 4315 9005 4317 9005 4317 9001
      4290 9001 4295 9043 4312 9043
TIME...MOT...LOC 2145Z 267DEG 29KT 4306 9022 

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

$$

CMILLER

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 7:05 PM CDT	Special Weather Statement	MKX	Jefferson	25 min
Aug 10, 7:24 PM CDT	Severe Thunderstorm Warning	MKX	Sheboygan	51 min
Aug 10, 7:43 PM CDT	Severe Thunderstorm Warning	MKX	Kenosha, Milwaukee, Ozaukee, Racine	32 min
Aug 10, 8:07 PM CDT	Special Marine Warning	MKX		53 min
Aug 10, 8:16 PM CDT	Special Marine Warning	MKX		44 min
Aug 11, 6:44 AM CDT	Small Craft Advisory	MKX		15 hr
Aug 11, 9:58 AM CDT	Special Weather Statement	MKX	Kenosha, Milwaukee, Racine, Rock, Walworth	77 min
Aug 11, 10:06 AM CDT	Special Marine Warning	MKX		84 min
Aug 11, 2:46 PM CDT	Severe Thunderstorm Warning	MKX	Green Lake, Marquette	59 min
Aug 11, 5:05 PM CDT	Special Weather Statement	MKX	Iowa	25 min
Aug 11, 5:10 PM CDT	Severe Thunderstorm Warning	MKX	Iowa	50 min
Aug 11, 5:24 PM CDT	Special Weather Statement	MKX	Milwaukee	36 min
Aug 11, 5:49 PM CDT	Severe Thunderstorm Warning	MKX	Milwaukee, Waukesha	41 min
Aug 11, 5:56 PM CDT	Special Marine Warning	MKX		94 min
Aug 11, 5:58 PM CDT	Special Weather Statement	MKX	Iowa	47 min
Aug 11, 6:04 PM CDT	Tornado Warning	MKX	Iowa	41 min
Aug 11, 6:24 PM CDT	Severe Thunderstorm Warning	MKX	Kenosha, Racine, Walworth	53 min
Aug 11, 6:34 PM CDT	Tornado Warning	MKX	Dane	15 min
Aug 11, 6:48 PM CDT	Special Marine Warning	MKX		57 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2021 Every 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.