Alert archive / Iowa / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 89, NWS Des Moines, IA

May 24, 2012Bremer County, Butler County, Grundy County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at May 24, 2012, 3:56 PM CDT for Bremer County, Butler County, Grundy County, Iowa. It was in force for 49 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: May 24, 2012, 3:56 PM CDT (20:56 UTC)
Expired: May 24, 2012, 4:45 PM CDT
In force: 49 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Bremer County, IA, Butler County, IA, Grundy County, IA

The radar

The Des Moines radar (KDMX), 134 km from the middle of the area, began a volume at 20:58 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 24, 4:05 PM CDT	HAIL 0.75	3 N Parkersburg, IA
May 24, 4:10 PM CDT	HAIL 1	1 Nw Parkersburg, IA	NSSL SHAVE

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
May 24, 3:30 PM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 8.9 hours before the alert went out and 212 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1568 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 84 m²/s²
0-3 km storm-relative helicity: 20 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

272 
WUUS53 KDMX 242056
SVRDMX
IAC017-023-075-242145-
/O.NEW.KDMX.SV.W.0089.120524T2056Z-120524T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
356 PM CDT THU MAY 24 2012

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN BREMER COUNTY IN NORTHEAST IOWA...
  BUTLER COUNTY IN NORTH CENTRAL IOWA...
  NORTHWESTERN GRUNDY COUNTY IN CENTRAL IOWA...

* UNTIL 445 PM CDT

* AT 353 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 7 MILES
  SOUTHWEST OF APLINGTON...OR 14 MILES EAST OF IOWA FALLS...AND
  MOVING NORTHEAST AT 60 MPH.

* LOCATIONS IMPACTED INCLUDE...
  APLINGTON...PARKERSBURG...ALLISON...SHELL ROCK...CLARKSVILLE...
  GREENE...WAVERLY...STOUT...NEW HARTFORD...PLAINFIELD AND FREDERIKA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PREPARE FOR DAMAGING WINDS...FALLING TREES AND FLYING DEBRIS. MOVE
INDOORS AND STAY AWAY FROM WINDOWS. IF YOU ARE IN A MOBILE HOME...
SEEK SHELTER IN A REINFORCED BUILDING.

&&

LAT...LON 4264 9252 4264 9255 4261 9255 4243 9276
      4248 9303 4257 9303 4291 9281 4290 9221
TIME...MOT...LOC 2057Z 225DEG 50KT 4256 9293
WIND...HAIL 60MPH 1.00IN

$$

BEERENDS

3 follow-up statements

104 
WWUS53 KDMX 242108
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
408 PM CDT THU MAY 24 2012

IAC017-023-075-242145-
/O.CON.KDMX.SV.W.0089.000000T0000Z-120524T2145Z/
GRUNDY IA-BREMER IA-BUTLER IA-
408 PM CDT THU MAY 24 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR BUTLER...
WESTERN BREMER AND NORTHWESTERN GRUNDY COUNTIES UNTIL 445 PM CDT...

AT 407 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING PING PONG BALL SIZE HAIL...
AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
PARKERSBURG...OR 24 MILES EAST OF IOWA FALLS...MOVING NORTHEAST AT 55
MPH. A SECOND SEVERE STORM IS LOCATED NEAR GREENE MOVING NORTHEAST 
AT 55 MPH. 

LOCATIONS IMPACTED INCLUDE...
  ALLISON...SHELL ROCK...CLARKSVILLE...GREENE...WAVERLY...NEW
  HARTFORD...PLAINFIELD AND FREDERIKA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PREPARE FOR LARGE HAIL AND DEADLY CLOUD TO GROUND LIGHTNING. PEOPLE
OUTSIDE SHOULD MOVE TO A REINFORCED BUILDING AND AWAY FROM WINDOWS.

PREPARE FOR DAMAGING WINDS...FALLING TREES AND FLYING DEBRIS. MOVE
INDOORS AND STAY AWAY FROM WINDOWS. IF YOU ARE IN A MOBILE HOME...GET
OUT NOW...AND SEEK SHELTER IN A REINFORCED BUILDING.

&&

LAT...LON 4264 9252 4264 9255 4261 9255 4243 9276
      4248 9303 4257 9303 4291 9281 4290 9221
TIME...MOT...LOC 2108Z 225DEG 47KT 4265 9281
WIND...HAIL 60MPH 1.50IN

$$

BEERENDS

057 
WWUS53 KDMX 242119
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
419 PM CDT THU MAY 24 2012

IAC075-242129-
/O.CAN.KDMX.SV.W.0089.000000T0000Z-120524T2145Z/
GRUNDY IA-
419 PM CDT THU MAY 24 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN GRUNDY COUNTY IS
CANCELLED...

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

LAT...LON 4264 9252 4264 9255 4261 9255 4255 9262
      4256 9291 4257 9303 4291 9281 4290 9221
TIME...MOT...LOC 2119Z 234DEG 53KT 4273 9263

$$

IAC017-023-242145-
/O.CON.KDMX.SV.W.0089.000000T0000Z-120524T2145Z/
BREMER IA-BUTLER IA-
419 PM CDT THU MAY 24 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR BUTLER AND
WESTERN BREMER COUNTIES UNTIL 445 PM CDT...

AT 416 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING PING PONG BALL SIZE HAIL...
AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 5
MILES WEST OF SHELL ROCK...OR 22 MILES NORTHWEST OF WATERLOO...MOVING
NORTHEAST AT 60 MPH.

LOCATIONS IMPACTED INCLUDE...
  SHELL ROCK...WAVERLY...PLAINFIELD AND FREDERIKA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PREPARE FOR LARGE HAIL AND DEADLY CLOUD TO GROUND LIGHTNING. PEOPLE
OUTSIDE SHOULD MOVE TO A REINFORCED BUILDING AND AWAY FROM WINDOWS.

PREPARE FOR DAMAGING WINDS...FALLING TREES AND FLYING DEBRIS. MOVE
INDOORS AND STAY AWAY FROM WINDOWS. IF YOU ARE IN A MOBILE HOME...GET
OUT NOW...AND SEEK SHELTER IN A REINFORCED BUILDING.

&&

LAT...LON 4264 9252 4264 9255 4261 9255 4255 9262
      4256 9291 4257 9303 4291 9281 4290 9221
TIME...MOT...LOC 2119Z 234DEG 53KT 4273 9263
WIND...HAIL 60MPH 1.50IN

$$

BEERENDS

982 
WWUS53 KDMX 242132
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
432 PM CDT THU MAY 24 2012

IAC023-242142-
/O.CAN.KDMX.SV.W.0089.000000T0000Z-120524T2145Z/
BUTLER IA-
432 PM CDT THU MAY 24 2012

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

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

LAT...LON 4264 9252 4264 9255 4288 9256 4291 9255
      4290 9221
TIME...MOT...LOC 2132Z 229DEG 45KT 4279 9248

$$

IAC017-242145-
/O.CON.KDMX.SV.W.0089.000000T0000Z-120524T2145Z/
BREMER IA-
432 PM CDT THU MAY 24 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WESTERN BREMER
COUNTY UNTIL 445 PM CDT...

AT 430 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING PING PONG BALL SIZE HAIL...
AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
WAVERLY...OR 21 MILES NORTH OF WATERLOO...MOVING NORTHEAST AT 50 MPH.

LOCATIONS IMPACTED INCLUDE...
  FREDERIKA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PREPARE FOR LARGE HAIL AND DEADLY CLOUD TO GROUND LIGHTNING. PEOPLE
OUTSIDE SHOULD MOVE TO A REINFORCED BUILDING AND AWAY FROM WINDOWS.

PREPARE FOR DAMAGING WINDS...FALLING TREES AND FLYING DEBRIS. MOVE
INDOORS AND STAY AWAY FROM WINDOWS. IF YOU ARE IN A MOBILE HOME...GET
OUT NOW...AND SEEK SHELTER IN A REINFORCED BUILDING.

&&

LAT...LON 4264 9252 4264 9255 4288 9256 4291 9255
      4290 9221
TIME...MOT...LOC 2132Z 229DEG 45KT 4279 9248
WIND...HAIL 60MPH 1.50IN

$$

BEERENDS

The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 23, 7:26 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Sac	49 min
May 23, 8:15 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Carroll, Crawford, Sac	45 min
May 23, 8:51 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Pocahontas	39 min
May 24, 3:30 PM CDT	Severe Thunderstorm Warning	DMX	Butler, Franklin, Hardin	45 min
May 24, 4:26 PM CDT	Severe Thunderstorm Warning	DMX	Decatur, Wayne	49 min
May 24, 4:30 PM CDT	Severe Thunderstorm Warning	DMX	Bremer	19 min
May 24, 4:55 PM CDT	Severe Thunderstorm Warning	DMX	Black Hawk, Grundy, Tama	50 min
May 24, 5:51 PM CDT	Severe Thunderstorm Warning	DMX	Mahaska, Marion, Poweshiek	39 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.