Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 37, NWS Milwaukee, WI

August 7, 2021Dane County, Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at Aug 7, 2021, 6:09 PM CDT for Dane County, Wisconsin. It was in force for 66 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 7, 2021, 6:09 PM CDT (23:09 UTC)
Expired: Aug 7, 2021, 7:15 PM CDT
In force: 66 min
Issued by: NWS Milwaukee, WI
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

County Dane County, WI

The radar

The Milwaukee radar (KMKX), 78 km from the middle of the area, began a volume at 23:12 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 7, 4:36 PM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 11.2 hours before the alert went out and 168 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: 1645 J/kg
Mixed-layer CIN: -79 J/kg
Mixed-layer LCL: 1006 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 39 m²/s²
0-3 km storm-relative helicity: 37 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

135 
WUUS53 KMKX 072309
SVRMKX
WIC025-080015-
/O.NEW.KMKX.SV.W.0037.210807T2309Z-210808T0015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Milwaukee/Sullivan WI
609 PM CDT Sat Aug 7 2021

The National Weather Service in Milwaukee/Sullivan has issued a

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

* Until 715 PM CDT.

* At 609 PM CDT, a severe thunderstorm was located 8 miles west of
  Mount Horeb, moving southeast at 30 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Madison, Fitchburg, Middleton, Stoughton, Verona, Oregon,
  McFarland, Monona, Mount Horeb, Cross Plains, Belleville, Shorewood
  Hills, Brooklyn, Black Earth, Maple Bluff, Blue Mounds, Camp
  Randall Stadium, Paoli, Pine Bluff and Mount Vernon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4286 8937 4286 8974 4289 8984 4312 8984
      4322 8963 4300 8908 4284 8934 4285 8937
TIME...MOT...LOC 2309Z 293DEG 25KT 4301 8990 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

CMILLER

5 follow-up statements

593 
WWUS53 KMKX 072327
SVSMKX

Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
627 PM CDT Sat Aug 7 2021

WIC025-080015-
/O.CON.KMKX.SV.W.0037.000000T0000Z-210808T0015Z/
Dane WI-
627 PM CDT Sat Aug 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT
FOR SOUTHERN DANE COUNTY...

At 627 PM CDT, a severe thunderstorm was located near Mount Horeb,
moving southeast at 30 mph.

HAZARD...60 mph wind gusts and penny size hail.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Madison, Fitchburg, Middleton, Stoughton, Verona, Oregon, McFarland,
Monona, Mount Horeb, Belleville, Shorewood Hills, Brooklyn, Maple
Bluff, 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 4286 8937 4286 8974 4289 8984 4304 8984
      4315 8946 4300 8908 4284 8934 4285 8937
TIME...MOT...LOC 2327Z 293DEG 25KT 4296 8974 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

CMILLER

316 
WWUS53 KMKX 072342
SVSMKX

Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
642 PM CDT Sat Aug 7 2021

WIC025-080015-
/O.CON.KMKX.SV.W.0037.000000T0000Z-210808T0015Z/
Dane WI-
642 PM CDT Sat Aug 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT
FOR SOUTHEASTERN DANE COUNTY...

At 642 PM CDT, a severe thunderstorm was located near Belleville, or
near Verona, moving east at 30 mph.

HAZARD...60 mph wind gusts and penny size hail.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Madison, Fitchburg, Stoughton, Verona, Oregon, McFarland, Monona,
Belleville, Shorewood Hills, Brooklyn, Maple Bluff, Camp Randall
Stadium, Paoli, 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 8937 4286 8963 4293 8964 4306 8961
      4312 8939 4300 8908 4284 8934 4285 8937
TIME...MOT...LOC 2342Z 270DEG 25KT 4292 8960 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

CMILLER

067 
WWUS53 KMKX 072357
SVSMKX

Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
657 PM CDT Sat Aug 7 2021

WIC025-080015-
/O.CON.KMKX.SV.W.0037.000000T0000Z-210808T0015Z/
Dane WI-
657 PM CDT Sat Aug 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT
FOR SOUTHEASTERN DANE COUNTY...

At 657 PM CDT, a severe thunderstorm was located near Belleville, or
near Oregon, moving southeast at 30 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Madison, Fitchburg, Stoughton, Verona, Oregon, McFarland, Monona,
Brooklyn, 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 4286 8937 4286 8950 4296 8954 4308 8942
      4309 8931 4300 8908 4284 8934 4285 8937
TIME...MOT...LOC 2357Z 293DEG 25KT 4288 8947 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

CMILLER

816 
WWUS53 KMKX 080004
SVSMKX

Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
704 PM CDT Sat Aug 7 2021

WIC025-080015-
/O.CON.KMKX.SV.W.0037.000000T0000Z-210808T0015Z/
Dane WI-
704 PM CDT Sat Aug 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT
FOR SOUTHEASTERN DANE COUNTY...

At 704 PM CDT, a severe thunderstorm was located over Brooklyn, or
near Oregon, moving east at 30 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Fitchburg, Stoughton, Oregon, McFarland, Monona and Brooklyn. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4286 8937 4286 8944 4297 8944 4304 8936
      4307 8925 4300 8908 4284 8934 4285 8937
TIME...MOT...LOC 0004Z 270DEG 25KT 4287 8940 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

CMILLER

432 
WWUS53 KMKX 080014 RRA
SVSMKX

Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
714 PM CDT Sat Aug 7 2021

WIC025-080024-
/O.EXP.KMKX.SV.W.0037.000000T0000Z-210808T0015Z/
Dane WI-
714 PM CDT Sat Aug 7 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN DANE COUNTY WILL
EXPIRE AT 715 PM CDT...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will 
be allowed to expire.  However gusty winds are still possible around 
this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 900 PM CDT for
south central Wisconsin.

LAT...LON 4286 8937 4286 8944 4297 8944 4304 8936
      4307 8925 4300 8908 4284 8934 4285 8937
TIME...MOT...LOC 0014Z 293DEG 25KT 4285 8934 

$$

CMILLER

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 6, 7:34 PM CDT	Areal Flood Advisory	MKX	Milwaukee, Waukesha	119 min
Aug 6, 7:38 PM CDT	Severe Thunderstorm Warning	MKX	Jefferson	37 min
Aug 6, 7:55 PM CDT	Special Marine Warning	MKX		50 min
Aug 6, 7:57 PM CDT	Special Weather Statement	MKX	Kenosha, Racine, Walworth	63 min
Aug 6, 8:00 PM CDT	Areal Flood Advisory	MKX	Jefferson, Rock, Walworth	2 hr
Aug 6, 8:14 PM CDT	Severe Thunderstorm Warning	MKX	Rock, Walworth	31 min
Aug 6, 8:51 PM CDT	Special Weather Statement	MKX	Rock, Walworth	54 min
Aug 6, 9:45 PM CDT	Severe Thunderstorm Warning	MKX	Dane	30 min
Aug 6, 10:15 PM CDT	Special Weather Statement	MKX	Dane	30 min
Aug 7, 10:06 AM CDT	Special Weather Statement	MKX	Columbia, Marquette	54 min
Aug 7, 11:01 AM CDT	Special Weather Statement	MKX	Columbia, Green Lake	59 min
Aug 7, 11:47 AM CDT	Special Weather Statement	MKX	Dodge, Jefferson	58 min
Aug 7, 12:32 PM CDT	Severe Thunderstorm Warning	MKX	Jefferson	43 min
Aug 7, 12:54 PM CDT	Severe Thunderstorm Warning	MKX	Jefferson, Waukesha	45 min
Aug 7, 1:48 PM CDT	Severe Thunderstorm Warning	MKX	Sauk	42 min
Aug 7, 3:53 PM CDT	Severe Thunderstorm Warning Considerable damage threat	MKX	Sauk	52 min
Aug 7, 4:33 PM CDT	Severe Thunderstorm Warning Considerable damage threat	MKX	Columbia, Dane, Iowa, Sauk	57 min
Aug 7, 4:38 PM CDT	Tornado Warning Tornado observed	MKX	Iowa	67 min
Aug 7, 5:17 PM CDT	Severe Thunderstorm Warning	MKX	Columbia, Green Lake, Marquette, Sauk	58 min
Aug 7, 5:26 PM CDT	Tornado Warning	MKX	Columbia	39 min
Aug 7, 5:31 PM CDT	Severe Thunderstorm Warning	MKX	Columbia, Dane	59 min
Aug 7, 5:33 PM CDT	Tornado Warning	MKX	Iowa	57 min
Aug 7, 6:03 PM CDT	Special Weather Statement	MKX	Dodge, Fond du Lac, Green Lake	42 min
Aug 7, 6:25 PM CDT	Severe Thunderstorm Warning	MKX	Dane	50 min
Aug 7, 6:40 PM CDT	Special Weather Statement	MKX	Jefferson	50 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.