Alert archive / Minnesota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 93, NWS La Crosse, WI

September 4, 2012Winona County, Minnesota

NWS La Crosse, WI issued this severe thunderstorm warning at Sep 4, 2012, 4:00 PM CDT for Winona County, Minnesota. It was in force for 30 min. 6 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: Sep 4, 2012, 4:00 PM CDT (21:00 UTC)
Expired: Sep 4, 2012, 4:30 PM CDT
In force: 30 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

County Winona County, MN

The radar

The La Crosse radar (KARX), 51 km from the middle of the area, began a volume at 21:00 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 4, 4:01 PM CDT	HAIL 1.75	3 W Utica, MN	REPORTED 1 MILE SOUTH OF ST. CHARLES
Sep 4, 4:10 PM CDT	HAIL 2	6 Ssw Utica, MN	REPORTED 4 MILES NW OF CLYDE
Sep 4, 4:25 PM CDT	HAIL 0.88	3 Wnw Winona, MN
Sep 4, 4:25 PM CDT	HAIL 1	Goodview, MN
Sep 4, 4:26 PM CDT	HAIL 1	Winona, MN	RELAYED FROM KTTC-TV
Sep 4, 4:26 PM CDT	HAIL 1.75	Stockton, MN

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
Sep 4, 3:27 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 9.0 hours before the alert went out and 173 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: 1446 J/kg
Mixed-layer CIN: -171 J/kg
Mixed-layer LCL: 1471 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 172 m²/s²
0-3 km storm-relative helicity: 221 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 7.8

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

831 
WUUS53 KARX 042100
SVRARX
MNC169-042200-
/O.NEW.KARX.SV.W.0093.120904T2100Z-120904T2200Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
400 PM CDT TUE SEP 4 2012

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WINONA COUNTY IN SOUTHEAST MINNESOTA...

* UNTIL 500 PM CDT

* AT 355 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  A SEVERE THUNDERSTORM LOCATED NEAR ST. CHARLES...OR 19 MILES       
  WEST OF WINONA...MOVING EAST AT 25 MPH. THIS STORM CAN PRODUCE     
  PING PONG BALL SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60        
  MPH.  

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  UTICA AROUND 405 PM...
  I 90 EXIT 242 AND FREMONT AROUND 410 PM...
  LEWISTON AROUND 415 PM...
  WYATTVILLE AROUND 420 PM...
  STOCKTON AND I 90 EXIT 249 AROUND 430 PM...
  I 90 EXIT 252 AND WILSON AROUND 435 PM...
  GOODVIEW AROUND 440 PM...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR LARGE
HAIL AND DAMAGING WINDS. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE
AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 4410 9170 4402 9157 4385 9156 4385 9190
      4391 9208 4398 9208
TIME...MOT...LOC 2059Z 258DEG 20KT 4395 9198
WIND...HAIL 60MPH 1.50IN

$$

BAUMGARDT

3 follow-up statements

606 
WWUS53 KARX 042112
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
412 PM CDT TUE SEP 4 2012

MNC169-042200-
/O.CON.KARX.SV.W.0093.000000T0000Z-120904T2200Z/
WINONA MN-
412 PM CDT TUE SEP 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR CENTRAL WINONA
COUNTY UNTIL 500 PM CDT...

TRAINED WEATHER SPOTTERS REPORTED GOLF BALL SIZE HAIL 1 MILE SOUTH 
OF ST CHARLES NEAR AND ALONG I-90 AT 401 PM. THIS LARGE 
HAIL...POSSIBLY TO BASEBALLS...WILL CONTINUE WITH THIS STORM AS IT 
TRACKS EAST. 

MOTORISTS ARE URGED TO SEEK SHELTER ALONG I-90 NEAR EXIT 233...EAST 
TO EXIT 242.  

AT 404 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THE
SEVERE THUNDERSTORM WAS LOCATED NEAR FREMONT...OR 15 MILES SOUTHWEST
OF WINONA...MOVING EAST AT 25 MPH. THIS STORM CAN PRODUCE LARGE
DAMAGING HAIL UP TO GOLF BALL SIZE AND DESTRUCTIVE WINDS IN EXCESS OF
70 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  WYATTVILLE AROUND 420 PM...
  STOCKTON AND I 90 EXIT 249 AROUND 425 PM...
  WILSON AROUND 430 PM...
  I 90 EXIT 252 AROUND 435 PM...
  WINONA AND WITOKA AROUND 440 PM...
  PICKWICK AND I 90 EXIT 257 AROUND 445 PM...
  RIDGEWAY AROUND 450 PM...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A VERY DANGEROUS SITUATION. IF YOU ARE IN THE PATH OF THIS
STORM...PREPARE IMMEDIATELY FOR DESTRUCTIVE WINDS AND HAIL...WHICH
WILL UPROOT TREES...DOWN POWER LINES...AND PRODUCE WIDESPREAD DAMAGE
TO BUILDINGS AND VEHICLES. EVACUATE MOBILE HOMES AS THEY MAY BE
OVERTURNED. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY
FROM WINDOWS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM TUESDAY
EVENING FOR NORTHEASTERN IOWA AND SOUTHEAST MINNESOTA AND WESTERN
WISCONSIN.

&&

LAT...LON 4391 9204 4397 9204 4407 9165 4402 9157
      4385 9156 4385 9190
TIME...MOT...LOC 2110Z 266DEG 21KT 4394 9188
WIND...HAIL 70MPH 1.75IN

$$

BAUMGARDT

097 
WWUS53 KARX 042119
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
419 PM CDT TUE SEP 4 2012

MNC169-042200-
/O.CON.KARX.SV.W.0093.000000T0000Z-120904T2200Z/
WINONA MN-
419 PM CDT TUE SEP 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN
WINONA COUNTY UNTIL 500 PM CDT...

TRAINED WEATHER SPOTTERS REPORTED HEN EGG SIZED HAIL...4 MILES 
NORTHWEST OF CLYDE ALONG I-90 AT 410 PM. 

AT 414 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THE
SEVERE THUNDERSTORM WAS LOCATED NEAR I 90 EXIT 242...OR 13 MILES
SOUTHWEST OF WINONA...MOVING EAST AT 20 MPH. THIS STORM CAN PRODUCE
LARGE DAMAGING HAIL UP TO GOLF BALL SIZE AND DESTRUCTIVE WINDS IN
EXCESS OF 70 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  I 90 EXIT 249 AND HART AROUND 430 PM...
  WILSON AND I 90 EXIT 252 AROUND 435 PM...
  WINONA AROUND 440 PM...
  I 90 EXIT 257 AND WITOKA AROUND 450 PM...
  RIDGEWAY AROUND 455 PM...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A VERY DANGEROUS SITUATION. IF YOU ARE IN THE PATH OF THIS
STORM...PREPARE IMMEDIATELY FOR DESTRUCTIVE WINDS AND HAIL...WHICH
WILL UPROOT TREES...DOWN POWER LINES...AND PRODUCE WIDESPREAD DAMAGE 
TO BUILDINGS AND VEHICLES. 

&&

LAT...LON 4391 9199 4395 9197 4407 9165 4402 9157
      4385 9156 4385 9190
TIME...MOT...LOC 2117Z 273DEG 18KT 4392 9183
WIND...HAIL 70MPH 1.75IN

$$

BAUMGARDT

950 
WWUS53 KARX 042130
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
430 PM CDT TUE SEP 4 2012

MNC169-042140-
/O.CAN.KARX.SV.W.0093.000000T0000Z-120904T2200Z/
WINONA MN-
430 PM CDT TUE SEP 4 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN WINONA COUNTY IS
CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE 
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY 
IN SOUTHERN WINONA COUNTY.

REMEMBER...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR 
CENTRAL WINONA COUNTY UNTIL 515 PM...WHICH INCLUDES THE CITY OF 
WINONA. 

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT
TUESDAY EVENING FOR NORTHEASTERN IOWA AND SOUTHEAST MINNESOTA AND
WESTERN WISCONSIN.

LAT...LON 4391 9199 4395 9197 4407 9165 4402 9157
      4385 9156 4385 9190
TIME...MOT...LOC 2130Z 273DEG 18KT 4392 9174

$$

BAUMGARDT

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 4, 4:39 AM CDT	Dense Fog Advisory	ARX	Dodge, Fillmore, Houston, Mower, Olmsted, Wabasha and 1 more	4 hr
Sep 4, 4:29 PM CDT	Severe Thunderstorm Warning	ARX	Winona	46 min
Sep 4, 4:53 PM CDT	Areal Flood Advisory	ARX	Winona	97 min
Sep 4, 5:17 PM CDT	Severe Thunderstorm Warning	ARX	Houston	28 min
Sep 4, 5:29 PM CDT	Severe Thunderstorm Warning	ARX	Houston, Winona	46 min
Sep 4, 5:38 PM CDT	Severe Thunderstorm Warning	ARX	Fillmore	28 min
Sep 4, 5:50 PM CDT	Severe Thunderstorm Warning	ARX	Houston	40 min
Sep 4, 6:14 PM CDT	Severe Thunderstorm Warning	ARX	Houston	46 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2012 Every severe thunderstorm warning in 2012

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.