Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 91, NWS La Crosse, WI

August 24, 2021Grant County, Wisconsin

NWS La Crosse, WI issued this severe thunderstorm warning at Aug 24, 2021, 4:09 PM CDT for Grant County, Wisconsin. It was in force for 36 min. 4 reports 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: Aug 24, 2021, 4:09 PM CDT (21:09 UTC)
Expired: Aug 24, 2021, 4:45 PM CDT
In force: 36 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

County Grant County, WI

The radar

The Quad Cities radar (KDVN), 109 km from the middle of the area, began a volume at 21:11 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
Aug 24, 4:13 PM CDT	TSTM WND DMG	1 W Cuba City, WI	SOME LARGE TREES DOWNED AND TIN RIPPED OFF A SHED. TIME ESTIMATED FROM RADAR.
Aug 24, 4:15 PM CDT	TSTM WND GST 58	Dickeyville, WI
Aug 24, 4:23 PM CDT	TSTM WND GST 60	Hazel Green, WI
Aug 24, 4:28 PM CDT	HAIL 0.25	2 Ne East Dubuque, IL	ESTIMATED WINDS 40-50 MPH.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

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 24, 1:52 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 9.2 hours before the alert went out and 109 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: 1809 J/kg
Mixed-layer CIN: -127 J/kg
Mixed-layer LCL: 1284 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 9 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

477 
WUUS53 KARX 242109
SVRARX
WIC043-242145-
/O.NEW.KARX.SV.W.0091.210824T2109Z-210824T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service La Crosse WI
409 PM CDT Tue Aug 24 2021

The National Weather Service in La Crosse has issued a

* Severe Thunderstorm Warning for...
  Southeastern Grant County in southwestern Wisconsin...

* Until 445 PM CDT.

* At 409 PM CDT, a severe thunderstorm was located over Dickeyville,
  or 9 miles southwest of Platteville, moving east at 25 mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Cuba City, Hazel Green, Dickeyville, Georgetown, Potosi, Kieler,
  Lock And Dam 11, Sandy Hook, Louisburg, Sinsinawa and Big Patch.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4251 9064 4254 9064 4258 9068 4264 9071
      4267 9087 4268 9089 4268 9043 4251 9042
TIME...MOT...LOC 2109Z 281DEG 20KT 4262 9057 

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

$$

Kurz

3 follow-up statements

974 
WWUS53 KARX 242130
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
430 PM CDT Tue Aug 24 2021

WIC043-242145-
/O.CON.KARX.SV.W.0091.000000T0000Z-210824T2145Z/
Grant WI-
430 PM CDT Tue Aug 24 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM CDT
FOR SOUTHEASTERN GRANT COUNTY...

At 430 PM CDT, a severe thunderstorm was located near Hazel Green, or
9 miles northwest of Galena, moving east at 20 mph.

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

SOURCE...Trained weather spotters. Reports of 60 mph winds around 
         Hazel Green.

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

Locations impacted include...
Cuba City, Hazel Green, Dickeyville, Georgetown, Kieler, Lock And Dam
11, Sandy Hook, Louisburg, Sinsinawa and Big Patch.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4251 9064 4254 9064 4258 9068 4268 9068
      4268 9043 4251 9042
TIME...MOT...LOC 2130Z 271DEG 18KT 4254 9050 

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

$$

Kurz

058 
WWUS53 KARX 242138
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
438 PM CDT Tue Aug 24 2021

WIC043-242145-
/O.CON.KARX.SV.W.0091.000000T0000Z-210824T2145Z/
Grant WI-
438 PM CDT Tue Aug 24 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM CDT
FOR SOUTHEASTERN GRANT COUNTY...

At 438 PM CDT, a severe thunderstorm was located over Hazel Green, or
7 miles north of Galena, moving east at 25 mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
Cuba City, Hazel Green, Georgetown, Lock And Dam 11, Sandy Hook,
Louisburg and Sinsinawa.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4251 9064 4254 9064 4268 9043 4251 9042
TIME...MOT...LOC 2138Z 281DEG 20KT 4253 9045 

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

$$

Kurz

778 
WWUS53 KARX 242144
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
444 PM CDT Tue Aug 24 2021

WIC043-242154-
/O.EXP.KARX.SV.W.0091.000000T0000Z-210824T2145Z/
Grant WI-
444 PM CDT Tue Aug 24 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN GRANT COUNTY WILL
EXPIRE AT 445 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.

A Severe Thunderstorm Watch remains in effect until 700 PM CDT for
southwestern Wisconsin.

LAT...LON 4251 9064 4254 9064 4268 9043 4251 9042
TIME...MOT...LOC 2144Z 281DEG 20KT 4253 9042 

$$

Kurz

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 24, 6:11 AM CDT	Special Weather Statement	ARX	Buffalo, Trempealeau	94 min
Aug 24, 6:50 AM CDT	Severe Thunderstorm Warning	ARX	Jackson, Trempealeau	40 min
Aug 24, 7:18 AM CDT	Severe Thunderstorm Warning	ARX	Clark, Jackson	72 min
Aug 24, 7:33 AM CDT	Special Weather Statement	ARX	Buffalo	72 min
Aug 24, 8:41 AM CDT	Special Weather Statement	ARX	Trempealeau	49 min
Aug 24, 9:07 AM CDT	Special Weather Statement	ARX	Clark, Taylor	53 min
Aug 24, 10:00 AM CDT	Special Weather Statement	ARX	Adams	15 min
Aug 24, 3:35 PM CDT	Tornado Warning	ARX	Grant	40 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.