Alert archive / Iowa / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 86, NWS Des Moines, IA

May 23, 20124 counties in Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at May 23, 2012, 8:15 PM CDT for 4 counties in Iowa. It was in force for 45 min. 4 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 23, 2012, 8:15 PM CDT (01:15 UTC)
Expired
May 23, 2012, 9:00 PM CDT
In force
45 min
Issued by
NWS Des Moines, IA
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Calhoun County, IA, Carroll County, IA, Crawford County, IA, Sac County, IA

The radar

The Des Moines radar (KDMX), 134 km from the middle of the area, began a volume at 01:16 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

TimeReportWhereRemark
May 23, 8:30 PM CDTTSTM WND DMGLake View, IADAMAGE FROM NEAR EAST OF ODEBOLT TO NEAR EARLY TO THE EAST SIDE OF LAKE VIEW. NUMEROUS POWER POLES DOWN...ROOFS BLOWN OFF OF OUTBUILDINGS AND TURKEY AND HOG CONFINEMENTS...AND BOATS THROWN AT A DEALERSHIP. TIME ESTIMATED FROM RADAR.
May 23, 8:30 PM CDTHAIL 15 E Odebolt, IA
May 23, 8:32 PM CDTTSTM WND DMG2 N Lake View, IATHIRTEEN LARGE POWER POLES SNAPPED ALONG A MILE LONG STRETCH OF PERKINS AVE. ONE THIRD OF THE ROOF OF A HOG CONFINEMENT BUILDING RIPPED OFF HALF A MILE UP THE ROAD. ANOTHER HALF MILE UP THE ROAD...ONE THIRD OF A MACHINE SHED WAS DESTROYED. LITTLE DAMAGE NOTED
May 23, 8:40 PM CDTTSTM WND GST 622 Ese Lake View, IAMEASURED BY WEATHER STATION. 1/2 MILE NORTH OF LOCATION BOAT DEALERSHIP HAD DAMAGE. DELAYED REPORT.

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.

IssuedProductOfficeLasted
May 23, 4:07 PM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 1.3 hours before the alert went out and 155 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-pSkew-T log-p diagram, Omaha, NE at 00:00Z on 2012-05-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1035 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 00:00Z on 2012-05-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 195 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
1035 J/kg
Mixed-layer CIN
-46 J/kg
Mixed-layer LCL
2387 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
195 m²/s²
0-3 km storm-relative helicity
291 m²/s²
Significant tornado parameter
0.0
Supercell composite
4.7

Open this sounding in Storm Lab

The text

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

067 
WUUS53 KDMX 240115
SVRDMX
IAC025-027-047-161-240200-
/O.NEW.KDMX.SV.W.0086.120524T0115Z-120524T0200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
815 PM CDT WED MAY 23 2012

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN CALHOUN COUNTY IN WEST CENTRAL IOWA...
  NORTHWESTERN CARROLL COUNTY IN WEST CENTRAL IOWA...
  NORTHEASTERN CRAWFORD COUNTY IN WEST CENTRAL IOWA...
  SAC COUNTY IN WEST CENTRAL IOWA...

* UNTIL 900 PM CDT

* AT 811 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
  SOUTH OF ODEBOLT...OR 13 MILES NORTH OF DENISON...AND MOVING
  NORTHEAST AT 45 MPH.

* LOCATIONS IMPACTED INCLUDE...
  ODEBOLT...LAKE VIEW...SAC CITY...WALL LAKE...BREDA...EARLY...
  AUBURN...YETTER AND LYTTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

LARGE HAIL CAN CAUSE INJURY AND PROPERTY DAMAGE. SEEK SAFETY INDOORS
UNTIL THE STORM PASSES.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS. TURN AROUND DON/T DROWN.

&&

LAT...LON 4222 9537 4222 9533 4238 9533 4257 9496
      4257 9493 4256 9491 4256 9481 4222 9482
      4203 9534
TIME...MOT...LOC 0115Z 229DEG 37KT 4223 9525
WIND...HAIL 60MPH 1.00IN

$$

PODRAZIK
2 follow-up statements
503 
WWUS53 KDMX 240141
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
841 PM CDT WED MAY 23 2012

IAC047-240149-
/O.CAN.KDMX.SV.W.0086.000000T0000Z-120524T0200Z/
CRAWFORD IA-
841 PM CDT WED MAY 23 2012

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

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

LAT...LON 4244 9522 4257 9496 4257 9493 4256 9491
      4256 9481 4222 9482 4214 9504 4219 9510
      4221 9509 4221 9512
TIME...MOT...LOC 0139Z 236DEG 36KT 4237 9498

$$

IAC025-027-161-240200-
/O.CON.KDMX.SV.W.0086.000000T0000Z-120524T0200Z/
SAC IA-CALHOUN IA-CARROLL IA-
841 PM CDT WED MAY 23 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHWESTERN
CARROLL...WESTERN CALHOUN AND EASTERN SAC COUNTIES UNTIL 900 PM
CDT...

AT 834 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 NEAR LAKE
VIEW...OR 21 MILES NORTHWEST OF CARROLL...MOVING NORTHEAST AT 40 MPH.

IN ADDITION...AT 8:30 PM CDT...A TRAINED SPOTTER REPORTED QUARTER 
SIZE HAIL 4 MILES EAST OF ODEBOLT WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
  SAC CITY...YETTER AND LYTTON.

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.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS. TURN AROUND DON/T DROWN.

&&

LAT...LON 4244 9522 4257 9496 4257 9493 4256 9491
      4256 9481 4222 9482 4214 9504 4219 9510
      4221 9509 4221 9512
TIME...MOT...LOC 0139Z 236DEG 36KT 4237 9498
WIND...HAIL 60MPH 1.00IN

$$

PODRAZIK
386 
WWUS53 KDMX 240200
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
900 PM CDT WED MAY 23 2012

IAC025-027-161-240210-
/O.EXP.KDMX.SV.W.0086.000000T0000Z-120524T0200Z/
SAC IA-CALHOUN IA-CARROLL IA-
900 PM CDT WED MAY 23 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN CARROLL...WESTERN
CALHOUN AND EASTERN SAC COUNTIES HAS EXPIRED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.  HOWEVER GUSTY WINDS ARE STILL POSSIBLE WITH THIS THUNDERSTORM.

IN ADDITION...STRONG THUNDERSTORMS MAY REDEVELOP...AND A SEVERE 
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 11 PM CDT.

LAT...LON 4244 9522 4257 9496 4257 9493 4256 9491
      4256 9481 4222 9482 4214 9504 4219 9510
      4221 9509 4221 9512
TIME...MOT...LOC 0200Z 236DEG 36KT 4249 9474

$$

PODRAZIK

The office that day

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

IssuedProductOfficeCountiesLasted
May 23, 7:26 PM CDTSevere Thunderstorm WarningDMXCalhoun, Sac49 min
May 23, 8:51 PM CDTSevere Thunderstorm WarningDMXCalhoun, Pocahontas39 min
May 24, 3:30 PM CDTSevere Thunderstorm WarningDMXButler, Franklin, Hardin45 min
May 24, 3:56 PM CDTSevere Thunderstorm WarningDMXBremer, Butler, Grundy49 min
May 24, 4:26 PM CDTSevere Thunderstorm WarningDMXDecatur, Wayne49 min
May 24, 4:30 PM CDTSevere Thunderstorm WarningDMXBremer19 min
May 24, 4:55 PM CDTSevere Thunderstorm WarningDMXBlack Hawk, Grundy, Tama50 min
May 24, 5:51 PM CDTSevere Thunderstorm WarningDMXMahaska, Marion, Poweshiek39 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2012Every 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.