Alert archive / Iowa / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 68, NWS Des Moines, IA

May 5, 2012Carroll County, Crawford County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at May 5, 2012, 2:31 AM CDT for Carroll County, Crawford County, Iowa. It was in force for 33 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 5, 2012, 2:31 AM CDT (07:31 UTC)
Expired
May 5, 2012, 3:04 AM CDT
In force
33 min
Issued by
NWS Des Moines, IA
Area
Storm-based polygon
Hail
1.0 in
Wind
50.0 mph

Counties Carroll County, IA, Crawford County, IA

The radar

The Des Moines radar (KDMX), 118 km from the middle of the area, began a volume at 07:32 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 nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 7.5 hours before the alert went out and 139 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 2012-05-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2635 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 2012-05-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 71 square meters per square second.1939Sfc1 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
2635 J/kg
Mixed-layer CIN
-14 J/kg
Mixed-layer LCL
1505 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
71 m²/s²
0-3 km storm-relative helicity
173 m²/s²
Significant tornado parameter
0.6
Supercell composite
8.5

Open this sounding in Storm Lab

The text

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

202 
WUUS53 KDMX 050731
SVRDMX
IAC027-047-050815-
/O.NEW.KDMX.SV.W.0068.120505T0731Z-120505T0815Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
231 AM CDT SAT MAY 5 2012

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN CARROLL COUNTY IN WEST CENTRAL IOWA...
  EAST CENTRAL CRAWFORD COUNTY IN WEST CENTRAL IOWA...

* UNTIL 315 AM CDT

* AT 228 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
  STORM WAS LOCATED 11 MILES NORTH OF MANNING...OR 12 MILES EAST OF
  DENISON...AND MOVING EAST AT 10 MPH.

* LOCATIONS IMPACTED INCLUDE...
  WESTSIDE...ARCADIA...HALBUR AND BREDA.

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 9497 4199 9489 4196 9519 4211 9526
TIME...MOT...LOC 0731Z 255DEG 9KT 4206 9511
WIND...HAIL <50MPH 1.00IN

$$

ZOGG
2 follow-up statements
861 
WWUS53 KDMX 050747
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
247 AM CDT SAT MAY 5 2012

IAC027-047-050815-
/O.CON.KDMX.SV.W.0068.000000T0000Z-120505T0815Z/
CARROLL IA-CRAWFORD IA-
247 AM CDT SAT MAY 5 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EAST CENTRAL
CRAWFORD AND NORTHWESTERN CARROLL COUNTIES UNTIL 315 AM CDT...

AT 243 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
WEST OF CARROLL...MOVING EAST AT 10 MPH.

LOCATIONS IMPACTED INCLUDE...
  ARCADIA...HALBUR AND BREDA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4197 9512 4213 9516 4221 9497 4199 9489
TIME...MOT...LOC 0747Z 255DEG 9KT 4207 9506
WIND...HAIL 60MPH 1.00IN

$$

ZOGG
542 
WWUS53 KDMX 050804
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
304 AM CDT SAT MAY 5 2012

IAC027-047-050814-
/O.CAN.KDMX.SV.W.0068.000000T0000Z-120505T0815Z/
CARROLL IA-CRAWFORD IA-
304 AM CDT SAT MAY 5 2012

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL CRAWFORD AND
NORTHWESTERN CARROLL COUNTIES IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.

LAT...LON 4197 9512 4213 9516 4221 9497 4199 9489
TIME...MOT...LOC 0804Z 255DEG 9KT 4208 9500

$$

ZOGG

The office that day

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

IssuedProductOfficeCountiesLasted
May 4, 10:27 PM CDTSevere Thunderstorm WarningDMXPalo Alto, Pocahontas48 min
May 5, 1:57 PM CDTSevere Thunderstorm WarningDMXKossuth, Winnebago33 min
May 5, 2:28 PM CDTSevere Thunderstorm WarningDMXWinnebago32 min
May 5, 2:54 PM CDTSevere Thunderstorm WarningDMXCerro Gordo, Winnebago, Worth66 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.