Alert archive / Iowa / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 77, NWS La Crosse, WI

July 25, 2012Fayette County, Winneshiek County, Iowa

NWS La Crosse, WI issued this severe thunderstorm warning at Jul 25, 2012, 10:03 PM CDT for Fayette County, Winneshiek County, Iowa. It was in force for 43 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: Jul 25, 2012, 10:03 PM CDT (03:03 UTC)
Expired: Jul 25, 2012, 10:46 PM CDT
In force: 43 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Hail: 0.5 in
Wind: 60.0 mph

Counties Fayette County, IA, Winneshiek County, IA

The radar

The La Crosse radar (KARX), 117 km from the middle of the area, began a volume at 03:04 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
Jul 25, 10:05 PM CDT	HAIL 0.5	2 Nw Westgate, IA	IN THE TOWN OF SUMNER
Jul 25, 10:13 PM CDT	TSTM WND DMG	Hawkeye, IA	NUMEROUS REPORTS OF TREES AND POWER LINES DOWN ACROSS TOWN
Jul 25, 10:20 PM CDT	TSTM WND GST 45	Oelwein, IA	ALSO 1/2 INCH HAIL
Jul 25, 10:23 PM CDT	TSTM WND DMG	West Union, IA	NUMEROUS REPORTS OF TREES AND POWER LINES DOWN ACROSS TOWN
Jul 25, 10:25 PM CDT	HAIL 1	3 N Fayette, IA

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
Jul 25, 5:16 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 3.1 hours before the alert went out and 183 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: 700 J/kg
Mixed-layer CIN: -149 J/kg
Mixed-layer LCL: 2702 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 84 m²/s²
0-3 km storm-relative helicity: 158 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

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

479 
WUUS53 KARX 260303
SVRARX
IAC065-191-260400-
/O.NEW.KARX.SV.W.0077.120726T0303Z-120726T0400Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
1003 PM CDT WED JUL 25 2012

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  FAYETTE COUNTY IN NORTHEAST IOWA...
  SOUTHERN WINNESHIEK COUNTY IN NORTHEAST IOWA...

* UNTIL 1100 PM CDT

* AT 1000 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SEVERE THUNDERSTORMS ROUGHLY ALONG A LINE EXTENDING FROM JERICO TO
  HAWKEYE TO FAIRBANK...MOVING NORTHEAST AT 35 MPH. THESE STORMS CAN
  PRODUCE DAMAGING WINDS IN EXCESS OF 60 MPH.  

* THE SEVERE THUNDERSTORMS WILL BE NEAR...
  WAUCOMA AROUND 1010 PM...
  MAYNARD AND ARLINGTON AROUND 1020 PM...
  FAYETTE AND HAWKEYE AROUND 1025 PM...
  SPILLVILLE AROUND 1030 PM...
  WEST UNION AROUND 1040 PM...
  ELGIN AND CALMAR AROUND 1045 PM...
  CLERMONT AROUND 1050 PM...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4264 9209 4327 9208 4330 9161 4265 9162
TIME...MOT...LOC 0303Z 203DEG 30KT 4315 9225 4298 9204
          4268 9205
WIND...HAIL 60MPH <.50IN

$$

SHEA

5 follow-up statements

389 
WWUS53 KARX 260314
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
1014 PM CDT WED JUL 25 2012

IAC065-191-260400-
/O.CON.KARX.SV.W.0077.000000T0000Z-120726T0400Z/
FAYETTE IA-WINNESHIEK IA-
1014 PM CDT WED JUL 25 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN 
WINNESHIEK AND FAYETTE COUNTIES UNTIL 1100 PM...

AT 1009 PM...A LINE OF SEVERE THUNDERSTORMS EXTENDED FROM WAUCOMA TO 
JUST WEST OF OELWEIN IOWA. THESE STORMS COULD BE PRODUCING STRONG TO 
DAMAGING WINDS AS THEY PROGRESS EAST. FREQUENT LIGHTNING AND HEAVY 
RAIN ARE ALSO EXPECTED.

* THE SEVERE THUNDERSTORMS WILL BE NEAR...
  WEST UNION AND FORT ATKINSON AROUND 1020 PM...
  ARLINGTON AND CALMAR AROUND 1030 PM...
  ELGIN AND CLERMONT AROUND 1035 PM...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE CAREFUL NEAR WINDOWS AND REMAIN ALERT FOR TREES FALLING IF STRONG 
WINDS OCCUR NEAR YOU.

&&

LAT...LON 4264 9209 4327 9208 4330 9161 4265 9162
TIME...MOT...LOC 0313Z 271DEG 31KT 4312 9204 4295 9186
          4265 9184
WIND...HAIL 60MPH <.50IN

$$

SHEA

834 
WWUS53 KARX 260322
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
1022 PM CDT WED JUL 25 2012

IAC065-191-260400-
/O.CON.KARX.SV.W.0077.000000T0000Z-120726T0400Z/
FAYETTE IA-WINNESHIEK IA-
1022 PM CDT WED JUL 25 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN
WINNESHIEK AND FAYETTE COUNTIES UNTIL 1100 PM CDT...

INTENSE WINDS ARE OCCURING WITH STORMS BETWEEN WEST UNION AND 
FAYETTE IOWA. THERE COULD ALSO BE LARGE HAIL FALLING IN THIS SAME 
AREA. THIS IS PART OF A LINE OF STORMS THAT EXTEND FROM ST LUCAS TO 
NEAR OELWEIN...WHICH WERE MOVING EAST AT 35 MPH.

WIND GUSTS OF 45 MPH AND HALF INCH HAIL WERE ALSO REPORTED IN 
OELWEIN.

* THE SEVERE THUNDERSTORMS WILL BE NEAR...
  ELGIN AND CLERMONT AROUND 1035 PM...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THESE STORMS...STAY INDOORS AND AWAY FROM 
WINDOWS. BE CAREFUL OF FALLING TREES OR LARGE LIMBS. STAY AWAY FROM 
WINDOWS THAT COULD BREAK IN LARGE HAIL.

&&

LAT...LON 4264 9209 4327 9208 4330 9161 4265 9162
TIME...MOT...LOC 0320Z 271DEG 31KT 4312 9196 4295 9178
          4265 9176
WIND...HAIL 60MPH <.50IN

$$


SHEA

900 
WWUS53 KARX 260329
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
1029 PM CDT WED JUL 25 2012

IAC191-260338-
/O.CAN.KARX.SV.W.0077.000000T0000Z-120726T0400Z/
WINNESHIEK IA-
1029 PM CDT WED JUL 25 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN WINNESHIEK COUNTY IS
CANCELLED...

THE STORMS STAYED MORE SEVERE IN FAYETTE COUNTY SO THE WARNING WILL 
BE CANCELLED.

LAT...LON 4264 9209 4280 9193 4308 9195 4308 9161
      4265 9162
TIME...MOT...LOC 0328Z 280DEG 36KT 4299 9173 4283 9160
          4264 9166

$$

IAC065-260400-
/O.CON.KARX.SV.W.0077.000000T0000Z-120726T0400Z/
FAYETTE IA-
1029 PM CDT WED JUL 25 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR FAYETTE COUNTY
UNTIL 1100 PM CDT...

AT 1023 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
THUNDERSTORMS WERE ROUGHLY ALONG A LINE EXTENDING FROM WEST UNION TO 
ARLINGTON TO AURORA...MOVING EAST AT 35 MPH. THESE STORMS CAN PRODUCE
QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH.

* THE SEVERE THUNDERSTORMS WILL BE NEAR...
  CLERMONT AND ELGIN AROUND 1035 PM...

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 4264 9209 4280 9193 4308 9195 4308 9161
      4265 9162
TIME...MOT...LOC 0328Z 280DEG 32KT 4299 9173 4283 9160
          4264 9166
WIND...HAIL 60MPH 1.00IN

$$

SHEA

746 
WWUS53 KARX 260339
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
1039 PM CDT WED JUL 25 2012

IAC065-260400-
/O.CON.KARX.SV.W.0077.000000T0000Z-120726T0400Z/
FAYETTE IA-
1039 PM CDT WED JUL 25 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR FAYETTE 
COUNTY UNTIL 1100 PM CDT...

TRAINED WEATHER SPOTTERS REPORTED QUARTER SIZE HAIL AT 1025 PM
ABOUT 3 MILES NORTH OF FAYETTE IOWA.

AS OF 1030 PM...THESE STORMS WERE OVER MAINLY EASTERN PARTS OF THE 
COUNTY...AND EXTEND BACK TOWARDS OELWEIN. THE STRONGEST WIND GUSTS 
HAVE LIKELY PUSHED INTO CLAYTON COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HEAVY RAIN AND FREQUENT LIGHTNING WILL CONTINUE FOR ANOTHER 20 TO 30 
MINUTES. REMAIN INDOORS.

&&

LAT...LON 4264 9209 4280 9193 4303 9178 4308 9161
      4265 9162
TIME...MOT...LOC 0338Z 280DEG 32KT 4299 9163 4283 9150
          4264 9156
WIND...HAIL 60MPH 1.00IN

$$

SHEA

875 
WWUS53 KARX 260346
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
1046 PM CDT WED JUL 25 2012

IAC065-260355-
/O.CAN.KARX.SV.W.0077.000000T0000Z-120726T0400Z/
FAYETTE IA-
1046 PM CDT WED JUL 25 2012

...THE SEVERE THUNDERSTORM WARNING FOR FAYETTE COUNTY IS CANCELLED...

THE STRONGEST WIND AND HAIL FROM THESE STORMS HAS MOVED OUT OF THE 
WARNED AREA. ADDITIONAL HEAVY RAIN...ESPECIALLY ACROSS SOUTHERN 
PARTS OF THE COUNTY MAY CONTINUE THROUGH 1130 PM THOUGH SO WATCH FOR 
PONDING.

DO NOT DRIVE INTO HIGH WATER.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 100 AM CDT.
 
LAT...LON 4264 9209 4280 9193 4303 9178 4308 9161
      4265 9162
TIME...MOT...LOC 0345Z 280DEG 32KT 4298 9155 4282 9142
          4263 9148

$$

SHEA

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 25, 8:38 PM CDT	Severe Thunderstorm Warning	ARX	Clayton	22 min
Jul 25, 9:40 PM CDT	Severe Thunderstorm Warning	ARX	Chickasaw	35 min
Jul 25, 10:25 PM CDT	Severe Thunderstorm Warning	ARX	Clayton	65 min
Jul 25, 10:55 PM CDT	Areal Flood Advisory	ARX	Fayette	84 min

Nearby

Severe Thunderstorm Warnings in Iowa, 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.