Alert archive / Iowa / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 9, NWS La Crosse, WI

April 10, 2011Howard County, Iowa; Fillmore County, Minnesota

NWS La Crosse, WI issued this severe thunderstorm warning at Apr 10, 2011, 3:39 PM CDT for Howard County, Iowa; Fillmore County, Minnesota. It was in force for 41 min. 3 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: Apr 10, 2011, 3:39 PM CDT (20:39 UTC)
Expired: Apr 10, 2011, 4:20 PM CDT
In force: 41 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Howard County, IA, Fillmore County, MN

The radar

The La Crosse radar (KARX), 78 km from the middle of the area, began a volume at 20:42 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
Apr 10, 3:40 PM CDT	HAIL 0.75	Elma, IA	40-50 MPH ESTIMATED WIND ALSO
Apr 10, 4:00 PM CDT	HAIL 0.75	7 W Harmony, MN	ALSO REPORTED 40 MPH WINDS
Apr 10, 4:03 PM CDT	HAIL 0.5	4 N Harmony, 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
Apr 10, 3:19 PM CDT	Tornado Watch PDS	SPC	7 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 8.7 hours before the alert went out and 186 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: 552 J/kg
Mixed-layer CIN: -270 J/kg
Mixed-layer LCL: 643 m above ground
0-6 km bulk shear: 80 kt
0-1 km storm-relative helicity: 528 m²/s²
0-3 km storm-relative helicity: 499 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

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

027 
WUUS53 KARX 102039
SVRARX
IAC089-MNC045-102130-
/O.NEW.KARX.SV.W.0009.110410T2039Z-110410T2130Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
339 PM CDT SUN APR 10 2011

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  HOWARD COUNTY IN NORTHEAST IOWA...
  FILLMORE COUNTY IN SOUTHEAST MINNESOTA...

* UNTIL 430 PM CDT

* AT 338 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM LOCATED NEAR MAPLE LEAF...OR 14 MILES WEST OF
  CRESCO...MOVING NORTHEAST AT 70 MPH. THIS STORM CAN PRODUCE QUARTER
  SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH.  

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  LIME SPRINGS AND DAVIS CORNERS AROUND 345 PM...
  BONAIR AND COUNTY ROADS A 23 AND V 58 AROUND 350 PM...
  BRISTOL AND GRANGER AROUND 355 PM...
  HARMONY AND WYKOFF AROUND 400 PM...
  PRESTON AND FOUNTAIN AROUND 405 PM...
  LANESBORO AND WHALAN AROUND 410 PM...
  PETERSON AROUND 415 PM...

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.

A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA. SEVERE
THUNDERSTORMS OCCASIONALLY PRODUCE TORNADOES...AND CAN DO SO QUICKLY.
MOVE INTO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR
BUSINESS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM SUNDAY EVENING FOR
NORTHEAST IOWA AND SOUTHEAST MINNESOTA AND WESTERN WISCONSIN.

&&

LAT...LON 4384 9218 4384 9173 4368 9173 4350 9198
      4350 9208 4342 9208 4321 9236 4331 9256
TIME...MOT...LOC 2039Z 220DEG 59KT 4333 9237
WIND...HAIL 60MPH 1.00IN

$$

RIECK

5 follow-up statements

585 
WWUS53 KARX 102044
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
344 PM CDT SUN APR 10 2011

IAC089-MNC045-102130-
/O.CON.KARX.SV.W.0009.000000T0000Z-110410T2130Z/
HOWARD IA-FILLMORE MN-
344 PM CDT SUN APR 10 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR FILLMORE AND
HOWARD COUNTIES UNTIL 430 PM CDT...

AT 342 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM LOCATED NEAR DAVIS CORNERS...OR 10 MILES WEST OF
CRESCO...MOVING NORTHEAST AT 70 MPH. THIS STORM CAN PRODUCE QUARTER
SIZE HAIL AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  COUNTY ROADS A 23 AND V 58 AND YORK AROUND 350 PM...
  GRANGER AND BRISTOL AROUND 355 PM...
  HARMONY AND WYKOFF AROUND 400 PM...
  PRESTON AND FOUNTAIN AROUND 405 PM...
  LANESBORO AND WHALAN AROUND 410 PM...
  PETERSON AND RUSHFORD VILLAGE AROUND 415 PM...
  RUSHFORD AROUND 420 PM...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS SITUATION. IF YOU ARE IN THE PATH OF THIS
STORM...PREPARE IMMEDIATELY FOR DESTRUCTIVE WINDS...WHICH CAN UPROOT
TREES...DOWN POWER LINES...AND CAUSE DAMAGE TO ROOFS AND WINDOWS.
EVACUATE MOBILE HOMES AS THEY MAY BE OVERTURNED. LARGE HAIL IS ALSO
EXPECTED...WHICH CAN CAUSE DAMAGE TO VEHICLES AND WINDOWS. SEEK
SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA. SEVERE
THUNDERSTORMS OCCASIONALLY PRODUCE TORNADOES...AND CAN DO SO QUICKLY.
MOVE INTO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR
BUSINESS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM SUNDAY EVENING FOR
NORTHEAST IOWA AND SOUTHEAST MINNESOTA AND WESTERN WISCONSIN.

&&

LAT...LON 4384 9218 4384 9173 4368 9173 4350 9198
      4350 9208 4342 9208 4321 9236 4331 9256
TIME...MOT...LOC 2044Z 220DEG 59KT 4339 9230
WIND...HAIL 70MPH 1.00IN

$$

RIECK

967 
WWUS53 KARX 102053
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
353 PM CDT SUN APR 10 2011

IAC089-MNC045-102130-
/O.CON.KARX.SV.W.0009.000000T0000Z-110410T2130Z/
HOWARD IA-FILLMORE MN-
353 PM CDT SUN APR 10 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR FILLMORE AND
EASTERN HOWARD COUNTIES UNTIL 430 PM CDT...

AT 351 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM LOCATED NEAR COUNTY ROADS A 23 AND V 58...OR 8
MILES NORTHWEST OF CRESCO...MOVING NORTHEAST AT 70 MPH. THIS STORM
CAN PRODUCE QUARTER SIZE HAIL AND DESTRUCTIVE WINDS IN EXCESS OF 70
MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  HARMONY AND HUTTON AROUND 400 PM...
  PRESTON AND FOUNTAIN AROUND 405 PM...
  LANESBORO AND WHALAN AROUND 410 PM...
  PETERSON AND RUSHFORD VILLAGE AROUND 415 PM...
  RUSHFORD AND RUSHFORD VILLAGE AROUND 420 PM...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS SITUATION. IF YOU ARE IN THE PATH OF THIS
STORM...PREPARE IMMEDIATELY FOR DESTRUCTIVE WINDS...WHICH CAN UPROOT
TREES...DOWN POWER LINES...AND CAUSE DAMAGE TO ROOFS AND WINDOWS.
EVACUATE MOBILE HOMES AS THEY MAY BE OVERTURNED. LARGE HAIL IS ALSO
EXPECTED...WHICH CAN CAUSE DAMAGE TO VEHICLES AND WINDOWS. SEEK
SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA. SEVERE
THUNDERSTORMS OCCASIONALLY PRODUCE TORNADOES...AND CAN DO SO QUICKLY.
MOVE INTO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR
BUSINESS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM SUNDAY EVENING FOR
NORTHEAST IOWA AND SOUTHEAST MINNESOTA AND WESTERN WISCONSIN.

&&

LAT...LON 4350 9234 4384 9218 4384 9173 4368 9173
      4350 9198 4350 9208 4342 9208 4321 9236
TIME...MOT...LOC 2053Z 220DEG 59KT 4350 9217
WIND...HAIL 70MPH 1.00IN

$$

RIECK

241 
WWUS53 KARX 102100
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
400 PM CDT SUN APR 10 2011

IAC089-102111-
/O.CAN.KARX.SV.W.0009.000000T0000Z-110410T2130Z/
HOWARD IA-
400 PM CDT SUN APR 10 2011

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

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

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT SUNDAY EVENING
FOR NORTHEAST IOWA AND SOUTHEAST MINNESOTA AND WESTERN WISCONSIN.

LAT...LON 4384 9210 4384 9173 4368 9173 4350 9198
      4350 9234
TIME...MOT...LOC 2101Z 220DEG 59KT 4360 9205

$$

MNC045-102130-
/O.CON.KARX.SV.W.0009.000000T0000Z-110410T2130Z/
FILLMORE MN-
400 PM CDT SUN APR 10 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR FILLMORE
COUNTY UNTIL 430 PM CDT...

AT 356 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM LOCATED NEAR BRISTOL...OR 10 MILES SOUTH OF
PRESTON...MOVING NORTHEAST AT 70 MPH. THIS STORM CAN PRODUCE QUARTER
SIZE HAIL AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  OLD BARN CAMPGROUND AND ISINOURS AROUND 405 PM...
  LANESBORO AND WHALAN AROUND 410 PM...
  PETERSON AND BRATSBERG AROUND 415 PM...
  RUSHFORD AND RUSHFORD VILLAGE AROUND 420 PM...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS SITUATION. IF YOU ARE IN THE PATH OF THIS
STORM...PREPARE IMMEDIATELY FOR DESTRUCTIVE WINDS...WHICH CAN UPROOT
TREES...DOWN POWER LINES...AND CAUSE DAMAGE TO ROOFS AND WINDOWS.
EVACUATE MOBILE HOMES AS THEY MAY BE OVERTURNED. LARGE HAIL IS ALSO
EXPECTED...WHICH CAN CAUSE DAMAGE TO VEHICLES AND WINDOWS. SEEK
SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM SUNDAY EVENING FOR
NORTHEAST IOWA AND SOUTHEAST MINNESOTA AND WESTERN WISCONSIN.

&&

LAT...LON 4384 9210 4384 9173 4368 9173 4350 9198
      4350 9234
TIME...MOT...LOC 2101Z 220DEG 59KT 4360 9205
WIND...HAIL 70MPH 1.00IN

$$

294 
WWUS53 KARX 102106
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
406 PM CDT SUN APR 10 2011

MNC045-102130-
/O.CON.KARX.SV.W.0009.000000T0000Z-110410T2130Z/
FILLMORE MN-
406 PM CDT SUN APR 10 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EASTERN
FILLMORE COUNTY UNTIL 430 PM CDT...

AT 405 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM LOCATED NEAR AMHERST...OR NEAR PRESTON...MOVING
NORTHEAST AT 70 MPH. THIS STORM CAN PRODUCE QUARTER SIZE HAIL AND
DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  PETERSON AND BRATSBERG AROUND 415 PM...
  RUSHFORD AND RUSHFORD VILLAGE AROUND 420 PM...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS SITUATION. IF YOU ARE IN THE PATH OF THIS
STORM...PREPARE IMMEDIATELY FOR DESTRUCTIVE WINDS...WHICH CAN UPROOT
TREES...DOWN POWER LINES...AND CAUSE DAMAGE TO ROOFS AND WINDOWS.
EVACUATE MOBILE HOMES AS THEY MAY BE OVERTURNED. LARGE HAIL IS ALSO
EXPECTED...WHICH CAN CAUSE DAMAGE TO VEHICLES AND WINDOWS. SEEK
SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM SUNDAY EVENING FOR
NORTHEAST IOWA AND SOUTHEAST MINNESOTA AND WESTERN WISCONSIN.

&&

LAT...LON 4366 9209 4384 9200 4384 9173 4368 9173
      4358 9188 4363 9211
TIME...MOT...LOC 2107Z 220DEG 59KT 4367 9196
WIND...HAIL 70MPH 1.00IN

$$

RIECK

936 
WWUS53 KARX 102120
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
420 PM CDT SUN APR 10 2011

MNC045-102130-
/O.CAN.KARX.SV.W.0009.000000T0000Z-110410T2130Z/
FILLMORE MN-
420 PM CDT SUN APR 10 2011

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

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

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT SUNDAY EVENING
FOR NORTHEAST IOWA AND SOUTHEAST MINNESOTA AND WESTERN WISCONSIN.

LAT...LON 4366 9209 4384 9200 4384 9173 4368 9173
      4358 9188 4363 9211
TIME...MOT...LOC 2120Z 220DEG 59KT 4383 9177

$$

RIECK

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 9, 10:53 PM CDT	Tornado Warning	ARX	Chickasaw, Floyd, Howard, Mitchell	37 min
Apr 9, 11:08 PM CDT	Severe Thunderstorm Warning	ARX	Mitchell	52 min
Apr 9, 11:15 PM CDT	Severe Thunderstorm Warning	ARX	Howard, Winneshiek	45 min
Apr 10, 4:11 PM CDT	Severe Thunderstorm Warning	ARX	Winneshiek	34 min
Apr 10, 5:03 PM CDT	Severe Thunderstorm Warning	ARX	Allamakee	27 min
Apr 10, 1:44 AM CDT	Areal Flood Advisory	ARX	Fillmore, Houston, Mower, Olmsted, Winona	3 hr
Apr 10, 4:24 PM CDT	Severe Thunderstorm Warning	ARX	Winona	41 min
Apr 10, 4:32 PM CDT	Tornado Warning	ARX	Houston	43 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2011 Severe Thunderstorm Warnings in Minnesota, 2011 Every severe thunderstorm warning in 2011

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.