Alert archive / Iowa / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 32, NWS Des Moines, IA

May 2, 20124 counties in Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at May 2, 2012, 12:38 AM CDT for 4 counties in Iowa. It was in force for 52 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
May 2, 2012, 12:38 AM CDT (05:38 UTC)
Expired
May 2, 2012, 1:30 AM CDT
In force
52 min
Issued by
NWS Des Moines, IA
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Carroll County, IA, Crawford County, IA, Greene County, IA, Sac County, IA

The radar

The Des Moines radar (KDMX), 114 km from the middle of the area, began a volume at 05:59 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
May 1, 9:18 PM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 5.6 hours before the alert went out and 142 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 2012-05-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1502 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 2012-05-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 75 square meters per square second.193958Sfc1 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
1502 J/kg
Mixed-layer CIN
-30 J/kg
Mixed-layer LCL
1477 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
75 m²/s²
0-3 km storm-relative helicity
122 m²/s²
Significant tornado parameter
0.4
Supercell composite
5.2

Open this sounding in Storm Lab

The text

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

957 
WUUS53 KDMX 020538
SVRDMX
IAC027-047-073-161-020630-
/O.NEW.KDMX.SV.W.0032.120502T0538Z-120502T0630Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
1238 AM CDT WED MAY 2 2012

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CARROLL COUNTY IN WEST CENTRAL IOWA...
  EASTERN CRAWFORD COUNTY IN WEST CENTRAL IOWA...
  NORTHWESTERN GREENE COUNTY IN WEST CENTRAL IOWA...
  SOUTHERN SAC COUNTY IN WEST CENTRAL IOWA...

* UNTIL 130 AM CDT

* AT 1234 AM 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 11
  MILES NORTHEAST OF DENISON...AND MOVING EAST AT 45 MPH.

* LOCATIONS IMPACTED INCLUDE...
  CARROLL...MANNING...GLIDDEN...COON RAPIDS...WESTSIDE...ASPINWALL...
  ARCADIA...BREDA...HALBUR...TEMPLETON...LIDDERDALE...WILLEY...
  CARROLL AIRPORT...DEDHAM...LANESBORO AND RALSTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO AN INTERIOR ROOM AND STAY AWAY FROM WINDOWS. IF YOU ARE IN A
MOBILE HOME...GET OUT NOW...AND SEEK SHELTER IN A REINFORCED
BUILDING.

&&

LAT...LON 4221 9532 4230 9531 4223 9485 4221 9486
      4221 9471 4218 9448 4186 9466 4186 9488
      4187 9517 4195 9552
TIME...MOT...LOC 0538Z 285DEG 37KT 4209 9511
WIND...HAIL 60MPH 1.00IN

$$

BEERENDS
3 follow-up statements
273 
WWUS53 KDMX 020553
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
1253 AM CDT WED MAY 2 2012

IAC161-020604-
/O.CAN.KDMX.SV.W.0032.000000T0000Z-120502T0630Z/
SAC IA-
1253 AM CDT WED MAY 2 2012

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

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

LAT...LON 4221 9523 4221 9471 4218 9448 4186 9466
      4187 9517 4192 9539
TIME...MOT...LOC 0554Z 289DEG 33KT 4198 9487

$$

IAC027-047-073-020630-
/O.CON.KDMX.SV.W.0032.000000T0000Z-120502T0630Z/
GREENE IA-CARROLL IA-CRAWFORD IA-
1253 AM CDT WED MAY 2 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EASTERN
CRAWFORD...CARROLL AND NORTHWESTERN GREENE COUNTIES UNTIL 130 AM
CDT...

AT 1251 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF
60 MPH.  THIS STORM WAS LOCATED 6 MILES SOUTH OF CARROLL...MOVING
EAST AT 40 MPH.

LOCATIONS IMPACTED INCLUDE...
  GLIDDEN...COON RAPIDS...LIDDERDALE...WILLEY...CARROLL AIRPORT...
  DEDHAM...LANESBORO AND RALSTON.

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...GET
OUT NOW...AND SEEK SHELTER IN A REINFORCED BUILDING.

&&

LAT...LON 4221 9523 4221 9471 4218 9448 4186 9466
      4187 9517 4192 9539
TIME...MOT...LOC 0554Z 289DEG 33KT 4198 9487
WIND...HAIL 60MPH <.75IN

$$

BEERENDS
328 
WWUS53 KDMX 020604
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
104 AM CDT WED MAY 2 2012

IAC047-020614-
/O.CAN.KDMX.SV.W.0032.000000T0000Z-120502T0630Z/
CRAWFORD IA-
104 AM CDT WED MAY 2 2012

...THE SEVERE THUNDERSTORM WARNING FOR EXTREME EASTERN CRAWFORD
COUNTY IS CANCELLED...

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

LAT...LON 4221 9509 4221 9471 4218 9448 4186 9466
      4187 9509
TIME...MOT...LOC 0604Z 289DEG 33KT 4198 9473

$$

IAC027-073-020630-
/O.CON.KDMX.SV.W.0032.000000T0000Z-120502T0630Z/
GREENE IA-CARROLL IA-
104 AM CDT WED MAY 2 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR CARROLL AND
NORTHWESTERN GREENE COUNTIES UNTIL 130 AM CDT...

AT 1259 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF
60 MPH.  THIS STORM WAS LOCATED 5 MILES SOUTHWEST OF GLIDDEN...OR 6
MILES SOUTHEAST OF CARROLL...MOVING EAST AT 40 MPH.

LOCATIONS IMPACTED INCLUDE...
  COON RAPIDS AND RALSTON.

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...GET
OUT NOW...AND SEEK SHELTER IN A REINFORCED BUILDING.

&&

LAT...LON 4221 9509 4221 9471 4218 9448 4186 9466
      4187 9509
TIME...MOT...LOC 0604Z 289DEG 33KT 4198 9473
WIND...HAIL 60MPH <.75IN

$$

BEERENDS
717 
WWUS53 KDMX 020629
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
129 AM CDT WED MAY 2 2012

IAC027-073-020638-
/O.EXP.KDMX.SV.W.0032.000000T0000Z-120502T0630Z/
GREENE IA-CARROLL IA-
129 AM CDT WED MAY 2 2012

...THE SEVERE THUNDERSTORM WARNING FOR CARROLL AND NORTHWESTERN
GREENE COUNTIES WILL EXPIRE AT 130 AM CDT...

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

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A SEVERE 
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 400 AM CDT.

REMEMBER...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR 
EXTREME EASTERN CARROLL COUNTY AND GREENE COUNTY.

LAT...LON 4221 9509 4221 9471 4218 9448 4186 9466
      4187 9509
TIME...MOT...LOC 0628Z 289DEG 33KT 4191 9445

$$

BEERENDS

The office that day

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

IssuedProductOfficeCountiesLasted
May 1, 9:59 PM CDTSevere Thunderstorm WarningDMXEmmet, Palo Alto46 min
May 1, 10:45 PM CDTSevere Thunderstorm WarningDMXKossuth, Palo Alto45 min
May 1, 11:24 PM CDTSevere Thunderstorm WarningDMXHumboldt, Webster, Wright51 min
May 1, 11:35 PM CDTSevere Thunderstorm WarningDMXCrawford25 min
May 2, 12:01 AM CDTSevere Thunderstorm WarningDMXCarroll, Crawford, Sac44 min
May 2, 1:02 AM CDTSevere Thunderstorm WarningDMXAudubon, Guthrie43 min
May 2, 1:07 AM CDTSevere Thunderstorm WarningDMXBoone, Carroll, Dallas, Greene, Guthrie38 min
May 2, 1:24 AM CDTTornado WarningDMXBoone36 min
May 2, 1:27 AM CDTSevere Thunderstorm WarningDMXBoone, Hamilton, Story, Webster48 min
May 2, 1:39 AM CDTSevere Thunderstorm WarningDMXBoone, Polk, Story51 min
May 2, 1:47 AM CDTTornado WarningDMXBoone, Hamilton, Hardin, Story28 min
May 2, 1:53 AM CDTSevere Thunderstorm WarningDMXDallas, Polk52 min
May 2, 2:04 AM CDTSevere Thunderstorm WarningDMXGrundy, Hardin, Marshall, Story41 min
May 2, 2:37 AM CDTSevere Thunderstorm WarningDMXBlack Hawk, Grundy, Marshall, Tama36 min
May 2, 3:18 AM CDTSevere Thunderstorm WarningDMXJasper, Mahaska, Marion, Poweshiek15 min
May 2, 3:46 PM CDTFlash Flood WatchDMXBlack Hawk, Bremer, Butler, Cerro Gordo, Franklin, Grundy and 1 more12 hr

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.