Alert archive / Iowa / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 90, NWS Des Moines, IA

May 24, 2012Decatur County, Wayne County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at May 24, 2012, 4:26 PM CDT for Decatur County, Wayne 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, 4:26 PM CDT (21:26 UTC)
Expired
May 24, 2012, 5:15 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 Decatur County, IA, Wayne County, IA

The radar

The Des Moines radar (KDMX), 120 km from the middle of the area, began a volume at 21:30 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 24, 4:30 PM CDTHAIL 0.75Ne Lamoni, IA
May 24, 5:00 PM CDTHAIL 15 Ene Davis City, IAALSO 1.10 INCHES OF RAIN IN 20 MINUTE3

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 24, 3:30 PM CDTSevere Thunderstorm WatchSPC4 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 9.4 hours before the alert went out and 232 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 12:00Z on 2012-05-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 13 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 12:00Z on 2012-05-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 209 square meters per square second.1939587897Sfc1 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
13 J/kg
Mixed-layer CIN
-551 J/kg
Mixed-layer LCL
701 m above ground
0-6 km bulk shear
69 kt
0-1 km storm-relative helicity
209 m²/s²
0-3 km storm-relative helicity
291 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.2

Open this sounding in Storm Lab

The text

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

085 
WUUS53 KDMX 242126
SVRDMX
IAC053-185-242215-
/O.NEW.KDMX.SV.W.0090.120524T2126Z-120524T2215Z/

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

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN DECATUR COUNTY IN SOUTH CENTRAL IOWA...
  SOUTHWESTERN WAYNE COUNTY IN SOUTH CENTRAL IOWA...

* UNTIL 515 PM CDT

* AT 425 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
  LAMONI...AND MOVING EAST AT 35 MPH.

* LOCATIONS IMPACTED INCLUDE...
  LAMONI AIRPORT...DAVIS CITY...PLEASANTON...LINEVILLE AND CLIO.

THIS INCLUDES INTERSTATE 35 BETWEEN MILE MARKERS 1 AND 10.

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 9401 4077 9338 4057 9337 4057 9401
TIME...MOT...LOC 2127Z 260DEG 30KT 4058 9391
WIND...HAIL 60MPH 1.00IN

$$

COGIL
3 follow-up statements
009 
WWUS53 KDMX 242147
SVSDMX

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

IAC053-185-242215-
/O.CON.KDMX.SV.W.0090.000000T0000Z-120524T2215Z/
WAYNE IA-DECATUR IA-
447 PM CDT THU MAY 24 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
DECATUR AND SOUTHWESTERN WAYNE COUNTIES UNTIL 515 PM CDT...

AT 443 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 10
MILES SOUTH OF LEON...OR 11 MILES EAST OF LAMONI...MOVING EAST AT 35
MPH.

LOCATIONS IMPACTED INCLUDE...
  LINEVILLE AND CLIO.

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.

&&

LAT...LON 4057 9389 4065 9383 4077 9338 4057 9337
TIME...MOT...LOC 2147Z 260DEG 30KT 4061 9369
WIND...HAIL 60MPH 1.50IN

$$

COGIL
530 
WWUS53 KDMX 242206
SVSDMX

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

IAC053-185-242215-
/O.CON.KDMX.SV.W.0090.000000T0000Z-120524T2215Z/
WAYNE IA-DECATUR IA-
506 PM CDT THU MAY 24 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
DECATUR AND SOUTHWESTERN WAYNE COUNTIES UNTIL 515 PM CDT...

AT 502 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 8 MILES
NORTHWEST OF MERCER...OR 17 MILES EAST OF LAMONI...MOVING EAST AT 30
MPH.

LOCATIONS IMPACTED INCLUDE...
  LINEVILLE AND CLIO.

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 4057 9377 4065 9369 4077 9338 4057 9337
TIME...MOT...LOC 2203Z 260DEG 25KT 4060 9361
WIND...HAIL 60MPH 1.00IN

$$

COGIL
877 
WWUS53 KDMX 242216
SVSDMX

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

IAC053-185-242226-
/O.EXP.KDMX.SV.W.0090.000000T0000Z-120524T2215Z/
WAYNE IA-DECATUR IA-
516 PM CDT THU MAY 24 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN DECATUR AND
SOUTHWESTERN WAYNE COUNTIES HAS EXPIRED...

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

LAT...LON 4057 9377 4065 9369 4077 9338 4057 9337
TIME...MOT...LOC 2206Z 260DEG 25KT 4060 9358

$$

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, 8:15 PM CDTSevere Thunderstorm WarningDMXCalhoun, Carroll, Crawford, Sac45 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, 4:30 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.