Alert archive / Iowa / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 21, NWS La Crosse, WI

April 12, 2014Clayton County, Fayette County, Iowa

NWS La Crosse, WI issued this severe thunderstorm warning at Apr 12, 2014, 7:56 PM CDT for Clayton County, Fayette County, Iowa. It was in force for 49 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 12, 2014, 7:56 PM CDT (00:56 UTC)
Expired: Apr 12, 2014, 8:45 PM CDT
In force: 49 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Hail: 1.5 in
Wind: 50.0 mph

Counties Clayton County, IA, Fayette County, IA

The radar

The La Crosse radar (KARX), 104 km from the middle of the area, began a volume at 01:00 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
Apr 12, 8:00 PM CDT	HAIL 1	Fayette, IA
Apr 12, 8:04 PM CDT	HAIL 1.5	Fayette, IA
Apr 12, 8:32 PM CDT	HAIL 1.75	Elgin, 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
Apr 12, 3:15 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 0.9 hours before the alert went out and 172 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: 661 J/kg
Mixed-layer CIN: -152 J/kg
Mixed-layer LCL: 1978 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 80 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

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

512 
WUUS53 KARX 130056
SVRARX
IAC043-065-130145-
/O.NEW.KARX.SV.W.0021.140413T0056Z-140413T0145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
756 PM CDT SAT APR 12 2014

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN FAYETTE COUNTY IN NORTHEAST IOWA...
  NORTHWESTERN CLAYTON COUNTY IN NORTHEAST IOWA...

* UNTIL 845 PM CDT

* AT 755 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR FAYETTE...OR
  NEAR WEST UNION...MOVING NORTHEAST AT 30 MPH.

  HAZARD...PING PONG BALL SIZE HAIL. 

  SOURCE...RADAR INDICATED. 

  IMPACT...PEOPLE AND ANIMALS OUTDOORS WILL BE INJURED. EXPECT 
           DAMAGE TO ROOFS...SIDING...WINDOWS AND VEHICLES. 

* THIS SEVERE THUNDERSTORM WILL BE NEAR...
  ELGIN AND CLERMONT AROUND 815 PM CDT.
  POSTVILLE AROUND 830 PM CDT.
  FARMERSBURG AROUND 840 PM CDT.
  MONONA AROUND 845 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 4279 9182 4292 9192 4309 9157 4308 9130
      4294 9120
TIME...MOT...LOC 0055Z 242DEG 25KT 4288 9178 

HAIL...1.50IN
WIND...<50MPH

$$

BOYNE

5 follow-up statements

915 
WWUS53 KARX 130108
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
808 PM CDT SAT APR 12 2014

IAC043-065-130145-
/O.CON.KARX.SV.W.0021.000000T0000Z-140413T0145Z/
FAYETTE IA-CLAYTON IA-
808 PM CDT SAT APR 12 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM CDT
FOR NORTHEASTERN FAYETTE AND NORTHWESTERN CLAYTON COUNTIES...

AT 807 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR ELGIN...OR 7 
MILES SOUTHEAST OF WEST UNION...MOVING NORTHEAST AT 30 MPH. AT 
805 PM...A SPOTTER IN FAYETTE REPORTED PING PONG SIZE HAIL.

HAZARD...PING PONG BALL SIZE HAIL. 

SOURCE...TRAINED WEATHER SPOTTERS. 

IMPACT...PEOPLE AND ANIMALS OUTDOORS WILL BE INJURED. EXPECT DAMAGE 
         TO ROOFS...SIDING...WINDOWS AND VEHICLES. 

THIS SEVERE STORM WILL BE NEAR...
  ELGIN AND CLERMONT AROUND 815 PM CDT.
  POSTVILLE AROUND 830 PM CDT.
  FARMERSBURG AROUND 840 PM CDT.
  MONONA AROUND 845 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM IS PRODUCING LARGE HAIL. SEEK SHELTER NOW INSIDE A STURDY
STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 4279 9182 4292 9192 4309 9157 4308 9130
      4294 9120
TIME...MOT...LOC 0107Z 242DEG 25KT 4292 9168 

HAIL...1.50IN
WIND...<50MPH

$$

BOYNE

254 
WWUS53 KARX 130114
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
814 PM CDT SAT APR 12 2014

IAC043-065-130145-
/O.CON.KARX.SV.W.0021.000000T0000Z-140413T0145Z/
FAYETTE IA-CLAYTON IA-
814 PM CDT SAT APR 12 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM CDT
FOR NORTHEASTERN FAYETTE AND NORTHWESTERN CLAYTON COUNTIES...

AT 813 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED OVER ELGIN...OR 
7 MILES EAST OF WEST UNION...MOVING NORTHEAST AT 25 MPH.

HAZARD...TWO INCH HAIL. 

SOURCE...RADAR INDICATED. 

IMPACT...PEOPLE AND ANIMALS OUTDOORS WILL BE INJURED. EXPECT DAMAGE 
         TO ROOFS...SIDING...WINDOWS AND VEHICLES. 

THIS SEVERE STORM WILL BE NEAR...
  POSTVILLE AROUND 835 PM CDT.
  MONONA AND FARMERSBURG AROUND 845 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM IS PRODUCING LARGE HAIL. SEEK SHELTER NOW INSIDE A STURDY
STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 4279 9182 4292 9192 4309 9157 4308 9130
      4294 9120
TIME...MOT...LOC 0113Z 241DEG 23KT 4293 9166 

HAIL...2.00IN
WIND...<50MPH

$$

BOYNE

393 
WWUS53 KARX 130121
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
821 PM CDT SAT APR 12 2014

IAC043-065-130145-
/O.CON.KARX.SV.W.0021.000000T0000Z-140413T0145Z/
FAYETTE IA-CLAYTON IA-
821 PM CDT SAT APR 12 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM CDT
FOR EAST CENTRAL FAYETTE AND NORTHWESTERN CLAYTON COUNTIES...

AT 820 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED OVER ELGIN...OR 9
MILES EAST OF WEST UNION...MOVING NORTHEAST AT 25 MPH.

HAZARD...TWO INCH HAIL. 

SOURCE...RADAR INDICATED. 

IMPACT...PEOPLE AND ANIMALS OUTDOORS WILL BE INJURED. EXPECT DAMAGE 
         TO ROOFS...SIDING...WINDOWS AND VEHICLES. 

THIS SEVERE STORM WILL BE NEAR...
  POSTVILLE AROUND 840 PM CDT.
  MONONA AND FARMERSBURG AROUND 845 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM IS PRODUCING LARGE HAIL. SEEK SHELTER NOW INSIDE A STURDY
STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 4283 9171 4292 9179 4309 9157 4308 9130
      4294 9120
TIME...MOT...LOC 0120Z 240DEG 22KT 4295 9163 

HAIL...2.00IN
WIND...<50MPH

$$

BOYNE

361 
WWUS53 KARX 130129
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
829 PM CDT SAT APR 12 2014

IAC043-065-130145-
/O.CON.KARX.SV.W.0021.000000T0000Z-140413T0145Z/
FAYETTE IA-CLAYTON IA-
829 PM CDT SAT APR 12 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM CDT
FOR EAST CENTRAL FAYETTE AND NORTHWESTERN CLAYTON COUNTIES...

AT 828 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR ELGIN...OR 
11 MILES NORTHWEST OF ELKADER...MOVING NORTHEAST AT 25 MPH.

HAZARD...PING PONG BALL SIZE HAIL. 

SOURCE...RADAR INDICATED. 

IMPACT...PEOPLE AND ANIMALS OUTDOORS WILL BE INJURED. EXPECT DAMAGE 
         TO ROOFS...SIDING...WINDOWS AND VEHICLES. 

THIS SEVERE STORM WILL BE NEAR...
  POSTVILLE AROUND 840 PM CDT.
  MONONA AND FARMERSBURG AROUND 845 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM IS PRODUCING LARGE HAIL. SEEK SHELTER NOW INSIDE A STURDY
STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 4283 9171 4292 9179 4309 9157 4308 9130
      4294 9120
TIME...MOT...LOC 0128Z 240DEG 22KT 4297 9157 

HAIL...1.50IN
WIND...<50MPH

$$

BOYNE

767 
WWUS53 KARX 130134
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
834 PM CDT SAT APR 12 2014

IAC043-065-130145-
/O.CON.KARX.SV.W.0021.000000T0000Z-140413T0145Z/
FAYETTE IA-CLAYTON IA-
834 PM CDT SAT APR 12 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM CDT
FOR EAST CENTRAL FAYETTE AND NORTHWESTERN CLAYTON COUNTIES...

AT 833 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR ELGIN...OR 11 
MILES NORTHWEST OF ELKADER...MOVING NORTHEAST AT 25 MPH. AT 832 PM 
CDT...A SPOTTER IN ELGIN REPORTED GOLFBALL SIZE HAIL WITH THIS STORM.

HAZARD...GOLF BALL SIZE HAIL. 

SOURCE...TRAINED WEATHER SPOTTERS. 

IMPACT...PEOPLE AND ANIMALS OUTDOORS WILL BE INJURED. EXPECT DAMAGE 
         TO ROOFS...SIDING...WINDOWS AND VEHICLES. 

THIS SEVERE STORM WILL BE NEAR...
  MONONA AND FARMERSBURG AROUND 845 PM CDT.

OTHER LOCATIONS IMPACTED BY THIS SEVERE THUNDERSTORM INCLUDE MONTAUK
HISTORIC SITE...COUNTY ROADS B 56 AND W 64...ST. OLAF...HIGHLAND...
GUNDER...HARDIN...WATSON...LUANA...GIARD AND FROELICH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM IS PRODUCING LARGE HAIL. SEEK SHELTER NOW INSIDE A STURDY
STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 4283 9171 4292 9179 4309 9157 4308 9130
      4294 9120
TIME...MOT...LOC 0133Z 240DEG 22KT 4299 9154 

HAIL...1.75IN
WIND...<50MPH

$$

BOYNE

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 12, 7:07 PM CDT	Severe Thunderstorm Warning	ARX	Fayette	53 min
Apr 12, 7:19 PM CDT	Severe Thunderstorm Warning	ARX	Allamakee, Winneshiek	41 min
Apr 12, 8:13 PM CDT	Severe Thunderstorm Warning	ARX	Allamakee	47 min
Apr 12, 8:35 PM CDT	Special Weather Statement	ARX	Allamakee, Chickasaw, Clayton, Fayette, Floyd, Winneshiek	85 min
Apr 12, 8:40 PM CDT	Severe Thunderstorm Warning	ARX	Allamakee, Clayton	50 min
Apr 12, 9:08 PM CDT	Severe Thunderstorm Warning	ARX	Floyd, Mitchell	52 min
Apr 12, 9:37 PM CDT	Severe Thunderstorm Warning	ARX	Allamakee, Clayton	23 min
Apr 12, 9:44 PM CDT	Severe Thunderstorm Warning	ARX	Allamakee, Clayton	31 min
Apr 12, 10:17 PM CDT	Special Weather Statement	ARX	Allamakee, Chickasaw, Clayton, Fayette, Winneshiek	88 min
Apr 12, 10:41 PM CDT	Areal Flood Advisory	ARX	Allamakee, Clayton, Winneshiek	3 hr
Apr 13, 1:48 AM CDT	Areal Flood Advisory	ARX	Allamakee, Clayton	117 min
Apr 13, 3:56 AM CDT	Flood Watch	ARX	Clayton	21 hr
Apr 13, 10:15 AM CDT	River Flood Warning	ARX	Allamakee, Clayton	9 days

Nearby

Severe Thunderstorm Warnings in Iowa, 2014 Every severe thunderstorm warning in 2014

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.