Alert archive / Iowa / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 7, NWS Des Moines, IA

March 29, 2012Decatur County, Ringgold County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Mar 29, 2012, 10:49 PM CDT for Decatur County, Ringgold County, Iowa. It was in force for 41 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
Mar 29, 2012, 10:49 PM CDT (03:49 UTC)
Expired
Mar 29, 2012, 11:30 PM CDT
In force
41 min
Issued by
NWS Des Moines, IA
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Decatur County, IA, Ringgold County, IA

The radar

The Des Moines radar (KDMX), 119 km from the middle of the area, began a volume at 03:51 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
Mar 29, 8:30 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 3.8 hours before the alert went out and 198 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 2012-03-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 761 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 00:00Z on 2012-03-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 76 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
761 J/kg
Mixed-layer CIN
-64 J/kg
Mixed-layer LCL
647 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
76 m²/s²
0-3 km storm-relative helicity
99 m²/s²
Significant tornado parameter
0.3
Supercell composite
2.5

Open this sounding in Storm Lab

The text

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

882 
WUUS53 KDMX 300349
SVRDMX
IAC053-159-300430-
/O.NEW.KDMX.SV.W.0007.120330T0349Z-120330T0430Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
1049 PM CDT THU MAR 29 2012

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN DECATUR COUNTY IN SOUTH CENTRAL IOWA...
  SOUTHERN RINGGOLD COUNTY IN SOUTH CENTRAL IOWA...

* UNTIL 1130 PM CDT

* AT 1047 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 MOUNT AYR...OR 20 MILES WEST OF LAMONI...AND MOVING
  EAST AT 45 MPH.

* LOCATIONS IMPACTED INCLUDE...
  LAMONI...MOUNT AYR...KELLERTON...BEACONSFIELD...LAMONI AIRPORT AND
  GRAND RIVER.

THIS INCLUDES INTERSTATE 35 BETWEEN MILE MARKERS 1 AND 8.

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 4067 9443 4090 9397 4090 9386 4057 9383
      4056 9438
TIME...MOT...LOC 0349Z 249DEG 37KT 4064 9428
WIND...HAIL 60MPH 1.00IN

$$

DONAVON
2 follow-up statements
159 
WWUS53 KDMX 300403
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
1103 PM CDT THU MAR 29 2012

IAC053-159-300430-
/O.CON.KDMX.SV.W.0007.000000T0000Z-120330T0430Z/
RINGGOLD IA-DECATUR IA-
1103 PM CDT THU MAR 29 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WESTERN
DECATUR AND SOUTHEASTERN RINGGOLD COUNTIES UNTIL 1130 PM CDT...

AT 1100 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 6 MILES
SOUTHEAST OF MOUNT AYR...OR 11 MILES WEST OF LAMONI...MOVING EAST AT
45 MPH.

LOCATIONS IMPACTED INCLUDE...
  LAMONI...KELLERTON...BEACONSFIELD...LAMONI AIRPORT AND GRAND RIVER.

THIS INCLUDES INTERSTATE 35 BETWEEN MILE MARKERS 1 AND 8.

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 4075 9426 4090 9397 4089 9386 4057 9383
      4056 9433
TIME...MOT...LOC 0403Z 249DEG 37KT 4069 9410
WIND...HAIL 60MPH 1.00IN

$$

DONAVON
833 
WWUS53 KDMX 300426
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
1126 PM CDT THU MAR 29 2012

IAC053-159-300437-
/O.EXP.KDMX.SV.W.0007.000000T0000Z-120330T0430Z/
RINGGOLD IA-DECATUR IA-
1126 PM CDT THU MAR 29 2012

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN DECATUR AND
SOUTHEASTERN RINGGOLD COUNTIES WILL EXPIRE AT 1130 PM CDT...

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

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A SEVERE 
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 2 AM.

LAT...LON 4075 9426 4090 9397 4089 9386 4057 9383
      4056 9433
TIME...MOT...LOC 0427Z 249DEG 34KT 4076 9385

$$

DONAVON

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 29, 7:25 PM CDTSevere Thunderstorm WarningDMXAudubon, Cass50 min
Mar 29, 8:13 PM CDTSevere Thunderstorm WarningDMXAdair, Cass47 min
Mar 29, 8:49 PM CDTSevere Thunderstorm WarningDMXTaylor44 min
Mar 29, 9:49 PM CDTSevere Thunderstorm WarningDMXRinggold, Taylor41 min
Mar 30, 6:00 PM CDTSevere Thunderstorm WarningDMXCrawford17 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.