Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 79, NWS Milwaukee, WI

September 13, 2021Dane County, Iowa County, Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at Sep 13, 2021, 2:15 AM CDT for Dane County, Iowa County, Wisconsin. It was in force for 45 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 13, 2021, 2:15 AM CDT (07:15 UTC)
Expired: Sep 13, 2021, 3:00 AM CDT
In force: 45 min
Issued by: NWS Milwaukee, WI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Dane County, WI, Iowa County, WI

The radar

The Milwaukee radar (KMKX), 97 km from the middle of the area, began a volume at 07:15 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

Time	Report	Where	Remark
Sep 13, 2:41 AM CDT	HAIL 0.75	1 S Verona, 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 00:00Z, 7.3 hours before the alert went out and 160 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: 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.

619 
WUUS53 KMKX 130715
SVRMKX
WIC025-049-130800-
/O.NEW.KMKX.SV.W.0079.210913T0715Z-210913T0800Z/

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

The National Weather Service in Milwaukee/Sullivan has issued a

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

* Until 300 AM CDT.

* At 215 AM CDT, a severe thunderstorm was located 8 miles north of
  Blanchardville, or 9 miles southwest of Mount Horeb, moving east at
  30 mph.

  HAZARD...Quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* Locations impacted include...
  Madison, Fitchburg, Middleton, Verona, Oregon, Mount Horeb,
  Belleville, Shorewood Hills, Barneveld, Blue Mounds, Ridgeway,
  Hollandale, Camp Randall Stadium, Paoli, Pine Bluff, Blue Mound St
  Park, Mount Vernon, 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 8997 4301 9000 4312 8941 4286 8937
TIME...MOT...LOC 0715Z 260DEG 27KT 4294 8988 

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

$$

BOXELL

3 follow-up statements

542 
WWUS53 KMKX 130731
SVSMKX

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

WIC049-130741-
/O.CAN.KMKX.SV.W.0079.000000T0000Z-210913T0800Z/
Iowa WI-
231 AM CDT Mon Sep 13 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN IOWA COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 4290 8984 4304 8984 4312 8941 4286 8937
TIME...MOT...LOC 0731Z 259DEG 28KT 4297 8970 

$$

WIC025-130800-
/O.CON.KMKX.SV.W.0079.000000T0000Z-210913T0800Z/
Dane WI-
231 AM CDT Mon Sep 13 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 AM CDT
FOR SOUTHWESTERN DANE COUNTY...

At 231 AM CDT, a severe thunderstorm was located near Mount Horeb,
moving east at 30 mph.

HAZARD...Half dollar size hail.

SOURCE...Radar indicated.

IMPACT...Damage to vehicles is expected.

Locations impacted include...
Madison, Fitchburg, Middleton, Verona, Oregon, Mount Horeb, Shorewood
Hills, Blue Mounds, Camp Randall Stadium, Paoli, Pine Bluff, Mount
Vernon, 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 4290 8984 4304 8984 4312 8941 4286 8937
TIME...MOT...LOC 0731Z 259DEG 28KT 4297 8970 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH

$$

BOXELL

726 
WWUS53 KMKX 130748
SVSMKX

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

WIC025-130800-
/O.CON.KMKX.SV.W.0079.000000T0000Z-210913T0800Z/
Dane WI-
248 AM CDT Mon Sep 13 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 AM CDT
FOR SOUTHWESTERN DANE COUNTY...

At 247 AM CDT, a severe thunderstorm was located from near Verona 
to Fitchburg, moving east at 30 mph.

HAZARD...Quarter size hail.

SOURCE...Radar indicated.

IMPACT...Damage to vehicles is expected.

Locations impacted include...
Western Madison, Fitchburg, Verona, Oregon, Shorewood Hills, Pine
Bluff, Mount Vernon, Henry Vilas Zoo, Camp Randall Stadium, Paoli and
UW-Madison.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4292 8973 4306 8968 4310 8941 4286 8937
      4287 8945
TIME...MOT...LOC 0747Z 260DEG 27KT 4299 8953 

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

$$

BOXELL

457 
WWUS53 KMKX 130757
SVSMKX

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

WIC025-130806-
/O.EXP.KMKX.SV.W.0079.000000T0000Z-210913T0800Z/
Dane WI-
257 AM CDT Mon Sep 13 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN DANE COUNTY WILL
EXPIRE AT 300 AM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

Remember, a Severe Thunderstorm Warning still remains in effect for
southeastern Dane County until 315 AM. 

LAT...LON 4292 8973 4306 8968 4310 8941 4286 8937
      4287 8945
TIME...MOT...LOC 0756Z 260DEG 27KT 4300 8948 

$$

BOXELL

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 13, 1:41 AM CDT	Special Weather Statement	MKX	Dane, Iowa	34 min
Sep 13, 1:55 AM CDT	Severe Thunderstorm Warning	MKX	Dane, Jefferson	50 min
Sep 13, 2:38 AM CDT	Severe Thunderstorm Warning	MKX	Jefferson, Waukesha	52 min
Sep 13, 2:45 AM CDT	Severe Thunderstorm Warning	MKX	Dane	30 min
Sep 13, 3:15 AM CDT	Special Weather Statement	MKX	Jefferson	30 min
Sep 13, 3:29 AM CDT	Special Weather Statement	MKX	Waukesha	31 min
Sep 13, 3:34 AM CDT	Severe Thunderstorm Warning	MKX	Milwaukee, Waukesha	41 min
Sep 13, 3:38 AM CDT	Special Marine Warning	MKX		75 min
Sep 13, 6:11 AM CDT	Severe Thunderstorm Warning	MKX	Iowa, Sauk	28 min
Sep 13, 7:43 AM CDT	Special Weather Statement	MKX	Jefferson	32 min
Sep 13, 8:21 AM CDT	Special Weather Statement	MKX	Milwaukee, Ozaukee, Washington, Waukesha	39 min
Sep 13, 1:13 PM CDT	Small Craft Advisory	MKX		29 hr
Sep 13, 3:51 PM CDT	Special Weather Statement	MKX	Dodge	39 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.