Alert archive / Minnesota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 97, NWS La Crosse, WI

September 4, 2012Fillmore County, Minnesota

NWS La Crosse, WI issued this severe thunderstorm warning at Sep 4, 2012, 5:38 PM CDT for Fillmore County, Minnesota. It was in force for 28 min. 2 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, 5:38 PM CDT (22:38 UTC)
Expired: Sep 4, 2012, 6:06 PM CDT
In force: 28 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Hail: 1.75 in
Wind: 60.0 mph

County Fillmore County, MN

The radar

The La Crosse radar (KARX), 61 km from the middle of the area, began a volume at 22:41 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, 5:57 PM CDT	TSTM WND GST 60	4 Nne Mabel, MN
Sep 4, 5:57 PM CDT	HAIL 2	4 Nne Mabel, MN	ALSO ESTIMATED WIND GUSTS OF 50 TO 60 MPH. HAIL STONES DENTED VEHICLE.

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, 10.6 hours before the alert went out and 196 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.

281 
WUUS53 KARX 042238
SVRARX
MNC045-042315-
/O.NEW.KARX.SV.W.0097.120904T2238Z-120904T2315Z/

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

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN FILLMORE COUNTY IN SOUTHEAST MINNESOTA...

* UNTIL 615 PM CDT

* AT 536 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM LOCATED NEAR NEWBURG...OR 16 MILES SOUTHEAST OF
  PRESTON...MOVING SOUTHEAST AT 15 MPH. THIS STORM CAN PRODUCE LARGE
  DAMAGING HAIL UP TO GOLF BALL SIZE AND DAMAGING WINDS IN EXCESS OF
  60 MPH. TRAINED WEATHER SPOTTERS HAVE ALREADY REPORTED TENNIS BALL
  SIZE HAIL WITH THIS STORM.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  NEWBURG AND MABEL 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.SEEK 
SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 4366 9195 4366 9173 4350 9173 4350 9196
      4354 9196
TIME...MOT...LOC 2238Z 294DEG 14KT 4356 9180
WIND...HAIL 60MPH 1.75IN

$$

BAUMGARDT

2 follow-up statements

165 
WWUS53 KARX 042259
SVSARX

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

MNC045-042315-
/O.CON.KARX.SV.W.0097.000000T0000Z-120904T2315Z/
FILLMORE MN-
559 PM CDT TUE SEP 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
FILLMORE COUNTY UNTIL 615 PM CDT...

TRAINED WEATHER SPOTTERS REPORTED TENNIS BALL SIZE HAIL EARLIER 
NORTH OF CANTON. THIS STORM IS LIKELY PRODUCING VERY LARGE HAIL JUST 
NORTHEAST OF NEWBURG. 

AT 555 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THE
SEVERE THUNDERSTORM WAS LOCATED OVER EXTREME SOUTHEASTERN FILLMORE
COUNTY...OR 13 MILES SOUTHWEST OF CALEDONIA...MOVING EAST AT 20 MPH.
THIS STORM CAN PRODUCE LARGE DAMAGING HAIL UP TO GOLF BALL SIZE AND
DAMAGING WINDS IN EXCESS OF 60 MPH.

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 4353 9174 4356 9180 4361 9180 4366 9173
      4353 9173
TIME...MOT...LOC 2258Z 286DEG 19KT 4356 9172
WIND...HAIL 60MPH 1.75IN

$$

BAUMGARDT

788 
WWUS53 KARX 042306
SVSARX

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

MNC045-042316-
/O.CAN.KARX.SV.W.0097.000000T0000Z-120904T2315Z/
FILLMORE MN-
606 PM CDT TUE SEP 4 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN FILLMORE COUNTY
IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.

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

LAT...LON 4353 9174 4356 9180 4361 9180 4366 9173
      4353 9173
TIME...MOT...LOC 2306Z 286DEG 19KT 4355 9166

$$

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, 5:50 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.