Alert archive / Iowa / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 16, NWS La Crosse, WI

May 3, 2012Allamakee County, Howard County, Winneshiek County, Iowa; Fillmore County, Houston County, Winona County, Minnesota

NWS La Crosse, WI issued this severe thunderstorm warning at May 3, 2012, 6:43 AM CDT for Allamakee County, Howard County, Winneshiek County, Iowa; Fillmore County, Houston County, Winona County, Minnesota. It was in force for 47 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: May 3, 2012, 6:43 AM CDT (11:43 UTC)
Expired: May 3, 2012, 7:30 AM CDT
In force: 47 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Allamakee County, IA, Howard County, IA, Winneshiek County, IA, Fillmore County, MN, Houston County, MN, Winona County, MN

The radar

The La Crosse radar (KARX), 26 km from the middle of the area, began a volume at 11:43 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
May 3, 6:44 AM CDT	TSTM WND GST 60	Decorah, IA
May 3, 7:01 AM CDT	TSTM WND DMG	Bratsberg, MN	LARGE PINE TREE DOWN BLOCKING STATE HIGHWAY 43.
May 3, 7:10 AM CDT	TSTM WND DMG	3 Se Houston, MN	TREES BLOWN DOWN ON PARTS OF HIGHWAY 76 BETWEEN HOUSTON AND CALEDONIA.
May 3, 7:15 AM CDT	TSTM WND GST 43	Mound Prairie, MN
May 3, 7:25 AM CDT	TSTM WND GST 44	2 Ne Nodine, MN

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 11.7 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: 84 J/kg
Mixed-layer CIN: -59 J/kg
Mixed-layer LCL: 1937 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 134 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

143 
WUUS53 KARX 031143
SVRARX
IAC005-089-191-MNC045-055-169-031230-
/O.NEW.KARX.SV.W.0016.120503T1143Z-120503T1230Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
643 AM CDT THU MAY 3 2012

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN ALLAMAKEE COUNTY IN NORTHEAST IOWA...
  NORTHEASTERN HOWARD COUNTY IN NORTHEAST IOWA...
  NORTHERN WINNESHIEK COUNTY IN NORTHEAST IOWA...
  EASTERN FILLMORE COUNTY IN SOUTHEAST MINNESOTA...
  HOUSTON COUNTY IN SOUTHEAST MINNESOTA...
  SOUTHEASTERN WINONA COUNTY IN SOUTHEAST MINNESOTA...

* UNTIL 730 AM CDT

* AT 638 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SEVERE THUNDERSTORMS ROUGHLY ALONG A LINE EXTENDING FROM PRESTON TO
  DECORAH...MOVING NORTHEAST AT 60 MPH. THESE STORMS CAN PRODUCE
  QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH.  

* THE SEVERE THUNDERSTORMS WILL BE NEAR...
  SPRING GROVE AROUND 650 AM...
  CALEDONIA AND NEW ALBIN AROUND 700 AM...
  HOUSTON AROUND 705 AM...
  HOKAH AND BROWNSVILLE AROUND 710 AM...
  LA CRESCENT AROUND 715 AM...
  DAKOTA AROUND 720 AM...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4401 9147 4389 9132 4377 9125 4366 9127
      4364 9126 4361 9127 4359 9123 4354 9125
      4351 9122 4345 9123 4342 9120 4321 9178
      4357 9225
TIME...MOT...LOC 1143Z 226DEG 52KT 4367 9200 4336 9163
WIND...HAIL 60MPH 1.00IN

$$

JW

4 follow-up statements

527 
WWUS53 KARX 031157
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
657 AM CDT THU MAY 3 2012

IAC089-031206-
/O.CAN.KARX.SV.W.0016.000000T0000Z-120503T1230Z/
HOWARD IA-
657 AM CDT THU MAY 3 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN HOWARD COUNTY IS
CANCELLED...

THE STORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE WARNED 
AREA.

LAT...LON 4401 9147 4389 9132 4377 9125 4368 9127
      4364 9126 4361 9127 4359 9123 4354 9125
      4351 9122 4345 9123 4342 9120 4327 9163
      4362 9210
TIME...MOT...LOC 1156Z 235DEG 48KT 4378 9181 4346 9144

$$

IAC005-191-MNC045-055-169-031230-
/O.CON.KARX.SV.W.0016.000000T0000Z-120503T1230Z/
ALLAMAKEE IA-WINNESHIEK IA-FILLMORE MN-HOUSTON MN-WINONA MN-
657 AM CDT THU MAY 3 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
WINONA...HOUSTON...EASTERN FILLMORE...NORTHEASTERN WINNESHIEK AND
NORTHERN ALLAMAKEE COUNTIES UNTIL 730 AM CDT...

AT 652 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS WERE ROUGHLY ALONG A LINE EXTENDING FROM LANESBORO TO
11 MILES SOUTHEAST OF SPRING GROVE...MOVING NORTHEAST AT 55 MPH.
THESE STORMS CAN PRODUCE PENNY SIZE HAIL AND DAMAGING WINDS IN EXCESS
OF 60 MPH.

* THE SEVERE THUNDERSTORMS WILL BE NEAR...
  NEW ALBIN AND HOUSTON AROUND 705 AM...
  HOKAH AND BROWNSVILLE AROUND 715 AM...
  LA CRESCENT AND DAKOTA AROUND 720 AM...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4401 9147 4389 9132 4377 9125 4368 9127
      4364 9126 4361 9127 4359 9123 4354 9125
      4351 9122 4345 9123 4342 9120 4327 9163
      4362 9210
TIME...MOT...LOC 1156Z 235DEG 48KT 4378 9181 4346 9144
WIND...HAIL 60MPH 0.75IN

$$

SHEA

930 
WWUS53 KARX 031205
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
705 AM CDT THU MAY 3 2012

IAC005-191-031214-
/O.CAN.KARX.SV.W.0016.000000T0000Z-120503T1230Z/
ALLAMAKEE IA-WINNESHIEK IA-
705 AM CDT THU MAY 3 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN WINNESHIEK AND
NORTHERN ALLAMAKEE COUNTIES IS CANCELLED...

THE STORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE WARNED 
AREA.

LAT...LON 4401 9147 4389 9132 4377 9125 4368 9127
      4364 9126 4361 9127 4359 9123 4354 9125
      4351 9122 4351 9173 4369 9193
TIME...MOT...LOC 1204Z 235DEG 48KT 4383 9171 4351 9135

$$

MNC045-055-169-031230-
/O.CON.KARX.SV.W.0016.000000T0000Z-120503T1230Z/
FILLMORE MN-HOUSTON MN-WINONA MN-
705 AM CDT THU MAY 3 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
WINONA...HOUSTON AND EASTERN FILLMORE COUNTIES UNTIL 730 AM
CDT...

AT 702 AM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
THUNDERSTORMS WERE ROUGHLY ALONG A LINE EXTENDING FROM RUSHFORD TO 
NEW ALBIN...MOVING NORTHEAST AT 55 MPH. THESE STORMS CAN PRODUCE 
PENNY SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH.

* THE SEVERE THUNDERSTORMS WILL BE NEAR...
  HOKAH AND BROWNSVILLE AROUND 715 AM...
  LA CRESCENT AND DAKOTA AROUND 720 AM...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THESE STORMS...PREPARE IMMEDIATELY FOR
DAMAGING WINDS AND SMALL HAIL. SEEK SHELTER NOW INSIDE A STURDY 
STRUCTURE AND STAY AWAY FROM WINDOWS. SCHOOL CHILDREN SHOULD NOT BE 
OUTSIDE THIS MORNING WAITING FOR THE BUS RIDES OR ON PLAYGROUNDS.

&&

LAT...LON 4401 9147 4389 9132 4377 9125 4368 9127
      4364 9126 4361 9127 4359 9123 4354 9125
      4351 9122 4351 9173 4369 9193
TIME...MOT...LOC 1204Z 235DEG 48KT 4383 9171 4351 9135
WIND...HAIL 60MPH 0.75IN

$$

SHEA

313 
WWUS53 KARX 031219
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
719 AM CDT THU MAY 3 2012

MNC045-031227-
/O.CAN.KARX.SV.W.0016.000000T0000Z-120503T1230Z/
FILLMORE MN-
719 AM CDT THU MAY 3 2012

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

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE 
WARNED AREA. TREE DAMAGE WAS REPORTED IN SOUTHERN AND EASTERN PARTS 
OF THE COUNTY WITH WIND GUSTS AS HIGH AS 70 MPH AROUND HARMONY.

LAT...LON 4401 9147 4389 9132 4377 9125 4368 9127
      4364 9126 4361 9127 4359 9123 4354 9125
      4351 9122 4360 9154 4383 9173
TIME...MOT...LOC 1217Z 236DEG 42KT 4391 9155 4362 9121

$$

MNC055-169-031230-
/O.CON.KARX.SV.W.0016.000000T0000Z-120503T1230Z/
HOUSTON MN-WINONA MN-
719 AM CDT THU MAY 3 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
WINONA AND HOUSTON COUNTIES UNTIL 730 AM CDT...

LOCAL LAW ENFORCEMENT OFFICIALS HAVE REPORTED SPORADIC TREE DAMAGE 
WITH THESE STORMS...ALONG WITH SMALL HAIL AND VERY HEAVY RAINS. THEY 
CONTINUE TO MOVE NORTHEAST AT 55 MPH AND WILL IMPACT AREAS LIKE 
HOKAH...DAKOTA...DRESBACH AND LA CRESCENT BEFORE 730 AM.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THESE STORMS...PREPARE IMMEDIATELY FOR
DAMAGING WINDS AND SMALL HAIL. SEEK SHELTER NOW INSIDE A STURDY 
STRUCTURE AND STAY AWAY FROM WINDOWS. SCHOOL CHILDREN SHOULD REMAIN 
INSIDE.

&&

LAT...LON 4401 9147 4389 9132 4377 9125 4368 9127
      4364 9126 4361 9127 4359 9123 4354 9125
      4351 9122 4360 9154 4383 9173
TIME...MOT...LOC 1217Z 236DEG 42KT 4391 9155 4362 9121
WIND...HAIL 60MPH 0.75IN

$$

SHEA

804 
WWUS53 KARX 031230
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
730 AM CDT THU MAY 3 2012

MNC055-169-031240-
/O.EXP.KARX.SV.W.0016.000000T0000Z-120503T1230Z/
HOUSTON MN-WINONA MN-
730 AM CDT THU MAY 3 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN WINONA AND
HOUSTON COUNTIES HAS EXPIRED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE 
WARNED AREA. HEAVY RAIN AND LIGHTNING REMAIN IN THEA AREA BUT THAT 
SHOULD MOVE OUT BY 830 AM.

LAT...LON 4401 9147 4389 9132 4377 9125 4368 9127
      4364 9126 4361 9127 4359 9123 4354 9125
      4351 9122 4360 9154 4383 9173
TIME...MOT...LOC 1230Z 236DEG 42KT 4399 9137 4370 9104

$$

SHEA

The office that day

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

Issued	Product	Office	Counties	Lasted
May 3, 5:44 AM CDT	Severe Thunderstorm Warning	ARX	Chickasaw, Floyd, Howard, Mitchell	31 min
May 3, 6:11 AM CDT	Severe Thunderstorm Warning	ARX	Chickasaw, Howard, Winneshiek	34 min
May 3, 5:24 PM CDT	Severe Thunderstorm Warning	ARX	Floyd, Mitchell	20 min
May 2, 7:29 PM CDT	Severe Thunderstorm Warning	ARX	Wabasha, Winona	38 min
May 2, 8:10 PM CDT	Severe Thunderstorm Warning	ARX	Wabasha	65 min
May 2, 8:48 PM CDT	Severe Thunderstorm Warning	ARX	Wabasha	72 min
May 2, 8:51 PM CDT	Flash Flood Warning	ARX	Wabasha	6 hr
May 2, 9:13 PM CDT	Severe Thunderstorm Warning	ARX	Wabasha	17 min
May 2, 9:19 PM CDT	Severe Thunderstorm Warning	ARX	Wabasha, Winona	56 min
May 2, 9:33 PM CDT	Tornado Warning	ARX	Wabasha	27 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2012 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.