Alert archive / Minnesota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 102, NWS La Crosse, WI

September 4, 2012Houston County, Minnesota

NWS La Crosse, WI issued this severe thunderstorm warning at Sep 4, 2012, 6:14 PM CDT for Houston County, Minnesota. It was in force for 46 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 4, 2012, 6:14 PM CDT (23:14 UTC)
Expired: Sep 4, 2012, 7:00 PM CDT
In force: 46 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Hail: 1.75 in
Wind: 60.0 mph

County Houston County, MN

The radar

The La Crosse radar (KARX), 21 km from the middle of the area, began a volume at 23:13 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, 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, 11.2 hours before the alert went out and 222 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.

059 
WUUS53 KARX 042314
SVRARX
MNC055-050000-
/O.NEW.KARX.SV.W.0102.120904T2314Z-120905T0000Z/

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

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

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

* UNTIL 700 PM CDT

* AT 614 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM LOCATED NEAR HOKAH...OR 6 MILES SOUTHWEST OF LA
  CROSSE...MOVING EAST AT 25 MPH. THIS STORM CAN PRODUCE LARGE
  DAMAGING HAIL UP TO GOLF BALL SIZE AND DAMAGING WINDS IN EXCESS    
  OF 60 MPH. 

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  MOUND PRAIRIE...HOKAH...AND BROWNSVILLE THROUGH 7 PM.

A SECOND STRONG STORM WAS LOCATED NEAR SPRING GROVE IN SOUTHWEST 
HOUSTON COUNTY AT 612 PM. THIS STORM WILL AFFECT 
WILMINGTON...WILLINGTON GROVE AND EITZEN THROUGH 7 PM. 

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 4384 9154 4385 9128 4377 9125 4368 9127
      4364 9126 4361 9127 4359 9123 4354 9125
      4350 9122 4350 9173
TIME...MOT...LOC 2311Z 281DEG 21KT 4374 9131
WIND...HAIL 60MPH 1.75IN

$$

BAUMGARDT

2 follow-up statements

114 
WWUS53 KARX 042335
SVSARX

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

MNC055-050000-
/O.CON.KARX.SV.W.0102.000000T0000Z-120905T0000Z/
HOUSTON MN-
635 PM CDT TUE SEP 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
HOUSTON COUNTY UNTIL 700 PM CDT...

QUARTER SIZE HAIL WAS REPORTED IN SPRING GROVE AND MOUND PRAIRIE 
EARLIER WITH THESE STORMS. 

AT 632 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS WERE ROUGHLY ALONG A LINE EXTENDING FROM LA CROSSE TO
STODDARD TO NEW ALBIN...MOVING EAST AT 25 MPH. THESE STORMS CAN
PRODUCE LARGE DAMAGING HAIL UP TO GOLF BALL SIZE AND DAMAGING WINDS
IN EXCESS OF 60 MPH.

* THE SEVERE THUNDERSTORMS WILL BE NEAR...
  CALEDONIA...EITZEN...AND RENO THROUGH 7 PM

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4363 9165 4369 9150 4384 9137 4385 9128
      4377 9125 4368 9127 4364 9126 4361 9127
      4359 9123 4354 9125 4350 9122 4351 9172
TIME...MOT...LOC 2333Z 281DEG 21KT 4380 9114 4363 9128
          4346 9145
WIND...HAIL 60MPH 1.75IN

$$

BAUMGARDT

438 
WWUS53 KARX 042356
SVSARX

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

MNC055-050006-
/O.EXP.KARX.SV.W.0102.000000T0000Z-120905T0000Z/
HOUSTON MN-
656 PM CDT TUE SEP 4 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN HOUSTON COUNTY
WILL EXPIRE AT 700 PM CDT...

THE LINE OF STORMS WHICH PROMPTED THE WARNING WILL HAVE MOVED OUT OF 
THE WARNED AREA BY THAT TIME.

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

LAT...LON 4363 9165 4369 9150 4384 9137 4385 9128
      4377 9125 4368 9127 4364 9126 4361 9127
      4359 9123 4354 9125 4350 9122 4351 9172
TIME...MOT...LOC 2356Z 281DEG 21KT 4377 9096 4360 9110
          4343 9127

$$

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, 5:29 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

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.