Alert archive / Minnesota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 96, NWS La Crosse, WI

September 4, 2012Houston County, Winona County, Minnesota

NWS La Crosse, WI issued this severe thunderstorm warning at Sep 4, 2012, 5:29 PM CDT for Houston County, Winona County, Minnesota. It was in force for 46 min. 5 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, 5:29 PM CDT (22:29 UTC)
Expired: Sep 4, 2012, 6:15 PM CDT
In force: 46 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

Counties Houston County, MN, Winona County, MN

The radar

The La Crosse radar (KARX), 21 km from the middle of the area, began a volume at 22:31 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
Sep 4, 5:30 PM CDT	HAIL 0.75	Hart, MN
Sep 4, 5:45 PM CDT	HAIL 0.25	2 E Nodine, MN
Sep 4, 5:50 PM CDT	HAIL 1	Mound Prairie, MN
Sep 4, 5:58 PM CDT	HAIL 2	Mound Prairie, MN
Sep 4, 6:15 PM CDT	HAIL 0.5	2 S Hokah, 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, 10.5 hours before the alert went out and 208 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.

470 
WUUS53 KARX 042229
SVRARX
MNC055-169-042315-
/O.NEW.KARX.SV.W.0096.120904T2229Z-120904T2315Z/

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

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN HOUSTON COUNTY IN SOUTHEAST MINNESOTA...
  SOUTHEASTERN WINONA COUNTY IN SOUTHEAST MINNESOTA...

* UNTIL 615 PM CDT

* AT 527 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM LOCATED NEAR COUNTY 9 AND SATHER VALLEY ROAD...
  OR 11 MILES WEST OF LA CRESCENT...MOVING EAST AT 15 MPH. THIS STORM
  CAN PRODUCE PING PONG BALL SIZE HAIL AND DAMAGING WINDS IN EXCESS
  OF 60 MPH.  

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  NODINE AROUND 535 PM...
  MOUND PRAIRIE AROUND 545 PM...
  I 90 EXIT 272 AND DRESBACH AROUND 600 PM...
  HOKAH AROUND 605 PM...
  LA CRESCENT AND I 90 EXIT 275 AROUND 610 PM...
  BROWNSVILLE AROUND 615 PM...

A SEVERE THUNDERSTORM WARNING ALSO REMAINS IN EFFECT UNTIL 545 PM 
FOR SOUTHEAST HOUSTON. 

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 4394 9185 4390 9134 4377 9125 4373 9125
      4372 9127 4369 9127 4368 9128 4376 9163
TIME...MOT...LOC 2228Z 283DEG 13KT 4381 9152
WIND...HAIL 60MPH 1.50IN

$$

BAUMGARDT

2 follow-up statements

468 
WWUS53 KARX 042243
SVSARX

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

MNC055-169-042315-
/O.CON.KARX.SV.W.0096.000000T0000Z-120904T2315Z/
HOUSTON MN-WINONA MN-
543 PM CDT TUE SEP 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
WINONA AND NORTHERN HOUSTON COUNTIES UNTIL 615 PM CDT...

AT 541 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM LOCATED NEAR MOUND PRAIRIE...OR 8 MILES WEST OF
LA CRESCENT...MOVING EAST AT 15 MPH. THIS STORM CAN PRODUCE QUARTER
SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  DRESBACH AROUND 555 PM...
  I 90 EXIT 272 AROUND 600 PM...
  HOKAH AROUND 605 PM...
  LA CRESCENT AROUND 610 PM...
  BROWNSVILLE AROUND 615 PM...

VERY HEAVY RAINFALL WILL ALSO ACCOMPANY THIS STORM WITH ALMOST NO 
VISIBILITY. 

NO REPORTS OF SEVERE WEATHER HAVE COME FROM THESE STORMS AS OF YET 
BUT RADAR INDICATES LARGE HAIL AND DAMAGING WINDS ARE STILL POSSIBLE.

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 4394 9185 4390 9134 4377 9125 4373 9125
      4372 9127 4369 9127 4368 9128 4376 9163
TIME...MOT...LOC 2242Z 283DEG 13KT 4380 9145
WIND...HAIL 60MPH 1.00IN

$$

BAUMGARDT

538 
WWUS53 KARX 042303
SVSARX

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

MNC055-169-042315-
/O.CON.KARX.SV.W.0096.000000T0000Z-120904T2315Z/
HOUSTON MN-WINONA MN-
603 PM CDT TUE SEP 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
WINONA AND NORTHEASTERN HOUSTON COUNTIES UNTIL 615 PM CDT...

TRAINED WEATHER SPOTTERS REPORTED 2 INCH DIAMETER HAIL NEAR MOUND 
PRAIRIE IN NORTHERN HOUSTON COUNTY AT 600 PM WITH THIS SEVERE 
THUNDERSTORM. 

AT 559 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THE
SEVERE THUNDERSTORM WAS LOCATED NEAR HOKAH...OR NEAR LA CRESCENT...
MOVING EAST AT 15 MPH. THIS STORM CAN PRODUCE LARGE DAMAGING HAIL UP
TO GOLF BALL SIZE AND DAMAGING WINDS IN EXCESS OF 60 MPH.

* THE LEADING EDGE OF THE SEVERE THUNDERSTORM WILL BE NEAR...
  LA CRESCENT AROUND 610 PM...
  BROWNSVILLE AROUND 615 PM...

EXPECT THE STORM TO LAST 45 MINUTES AT THESE LOCATIONS WITH  
HEAVY RAIN FOR THAT PERIOD. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS SITUATION. IF YOU ARE IN THE PATH OF THIS 
STORM...PREPARE IMMEDIATELY FOR DESTRUCTIVE HAIL. SEEK SHELTER NOW 
INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 4390 9134 4377 9125 4373 9125 4372 9127
      4369 9127 4368 9128 4375 9158 4391 9159
TIME...MOT...LOC 2301Z 283DEG 13KT 4378 9136
WIND...HAIL 60MPH 1.75IN

$$

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, 4:00 PM CDT	Severe Thunderstorm Warning	ARX	Winona	30 min
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, 5:38 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.