Alert archive / Minnesota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 95, NWS La Crosse, WI

September 4, 2012Houston County, Minnesota; Allamakee County, Iowa; Vernon County, Wisconsin

NWS La Crosse, WI issued this severe thunderstorm warning at Sep 4, 2012, 5:17 PM CDT for Houston County, Minnesota; Allamakee County, Iowa; Vernon County, Wisconsin. It was in force for 28 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: Sep 4, 2012, 5:17 PM CDT (22:17 UTC)
Expired: Sep 4, 2012, 5:45 PM CDT
In force: 28 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Hail: 1.75 in
Wind: 60.0 mph

Counties Allamakee County, IA, Houston County, MN, Vernon County, WI

The radar

The La Crosse radar (KARX), 47 km from the middle of the area, began a volume at 22:17 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, 5:40 PM CDT	HAIL 1.75	New Albin, IA	RELAYED BY KWWL
Sep 4, 5:44 PM CDT	HAIL 1.75	Genoa, WI
Sep 4, 5:44 PM CDT	HAIL 1.75	New Albin, IA
Sep 4, 5:46 PM CDT	HAIL 1	1 S Genoa, WI

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

Davenport, (KDVN), launched 12:00Z, 10.3 hours before the alert went out and 216 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: 1827 J/kg
Mixed-layer CIN: -32 J/kg
Mixed-layer LCL: 971 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 57 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

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

197 
WUUS53 KARX 042217
SVRARX
IAC005-MNC055-WIC123-042245-
/O.NEW.KARX.SV.W.0095.120904T2217Z-120904T2245Z/

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

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN ALLAMAKEE COUNTY IN NORTHEAST IOWA...
  SOUTHEASTERN HOUSTON COUNTY IN SOUTHEAST MINNESOTA...
  SOUTHWESTERN VERNON COUNTY IN SOUTHWEST WISCONSIN...

* UNTIL 545 PM CDT

* AT 512 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM LOCATED NEAR HANOVER...OR 8 MILES NORTH OF
  WAUKON...MOVING NORTHEAST AT 40 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...
  NEW ALBIN AND COUNTY 5 AND PEYTON ROAD AROUND 530 PM...
  VICTORY AND RED MOUND AROUND 535 PM...
  ROMANCE AND GENOA AROUND 540 PM...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS SITUATION. IF YOU ARE IN THE PATH OF THIS
STORM...PREPARE IMMEDIATELY FOR DESTRUCTIVE HAIL...WHICH CAN
SIGNIFICANTLY DAMAGE ROOFS...WINDOWS...SIDING AND VEHICLES. DAMAGING
WINDS ARE ALSO EXPECTED...WHICH WILL UPROOT TREES AND DOWN POWER
LINES. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM
WINDOWS.

&&

LAT...LON 4340 9161 4342 9161 4365 9124 4352 9104
      4326 9148
TIME...MOT...LOC 2217Z 229DEG 34KT 4342 9143
WIND...HAIL 60MPH 1.75IN

$$

AJ

2 follow-up statements

690 
WWUS53 KARX 042231
SVSARX

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

IAC005-MNC055-WIC123-042245-
/O.CON.KARX.SV.W.0095.000000T0000Z-120904T2245Z/
ALLAMAKEE IA-HOUSTON MN-VERNON WI-
531 PM CDT TUE SEP 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHWESTERN
VERNON...SOUTHEASTERN HOUSTON AND NORTHERN ALLAMAKEE COUNTIES UNTIL
545 PM CDT...

AT 527 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM LOCATED NEAR COUNTY ROADS A 26 AND X 6 A...OR 7 
MILES SOUTHEAST OF DORCHESTER...MOVING NORTHEAST AT 20 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...
  NEW ALBIN AND COUNTY 5 AND PEYTON ROAD AROUND 545 PM...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS SITUATION. IF YOU ARE IN THE PATH OF THIS
STORM...PREPARE IMMEDIATELY FOR DESTRUCTIVE HAIL...WHICH CAN
SIGNIFICANTLY DAMAGE ROOFS...WINDOWS...SIDING AND VEHICLES. DAMAGING
WINDS ARE ALSO EXPECTED...WHICH WILL UPROOT TREES AND DOWN POWER
LINES. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM
WINDOWS.

&&

LAT...LON 4333 9154 4339 9145 4342 9149 4346 9155
      4365 9124 4352 9104 4326 9148
TIME...MOT...LOC 2230Z 222DEG 19KT 4344 9140
WIND...HAIL 60MPH 1.75IN

$$

AJ

521 
WWUS53 KARX 042242
SVSARX

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

IAC005-MNC055-WIC123-042252-
/O.EXP.KARX.SV.W.0095.000000T0000Z-120904T2245Z/
ALLAMAKEE IA-HOUSTON MN-VERNON WI-
542 PM CDT TUE SEP 4 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN VERNON...
SOUTHEASTERN HOUSTON AND NORTHERN ALLAMAKEE COUNTIES WILL EXPIRE AT
545 PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE 
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR 
PROPERTY. HOWEVER...THE STORM MAY STILL PRODUCE SMALL HAIL...ALONG 
WITH BRIEF HEAVY RAIN AND FREQUENT LIGHTNING AS IT MOVES THROUGH THE 
NEW ALBIN AREA BY 550 PM.

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

LAT...LON 4333 9154 4339 9145 4342 9149 4346 9155
      4365 9124 4352 9104 4326 9148
TIME...MOT...LOC 2242Z 222DEG 19KT 4349 9134

$$

AJ

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, 5:29 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
Sep 4, 6:09 PM CDT	Severe Thunderstorm Warning	ARX	Allamakee, Clayton	36 min
Sep 4, 6:37 PM CDT	Severe Thunderstorm Warning	ARX	Allamakee, Clayton	38 min
Sep 4, 6:38 PM CDT	Severe Thunderstorm Warning	ARX	Allamakee	52 min
Sep 4, 5:41 PM CDT	Severe Thunderstorm Warning	ARX	Clark	64 min
Sep 4, 5:56 PM CDT	Severe Thunderstorm Warning	ARX	La Crosse, Vernon	64 min
Sep 4, 6:16 PM CDT	Severe Thunderstorm Warning	ARX	Clark	29 min
Sep 4, 6:48 PM CDT	Severe Thunderstorm Warning	ARX	Crawford, Vernon	57 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2012 Severe Thunderstorm Warnings in Iowa, 2012 Severe Thunderstorm Warnings in Wisconsin, 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.