Alert archive / Iowa / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 79, NWS Des Moines, IA

May 6, 20124 counties in Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at May 6, 2012, 8:27 AM CDT for 4 counties in Iowa. It was in force for 48 min. 1 report 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 6, 2012, 8:27 AM CDT (13:27 UTC)
Expired
May 6, 2012, 9:15 AM CDT
In force
48 min
Issued by
NWS Des Moines, IA
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Jasper County, IA, Marion County, IA, Polk County, IA, Warren County, IA

The radar

The Des Moines radar (KDMX), 39 km from the middle of the area, began a volume at 13:28 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 6, 8:35 AM CDTHAIL 0.882 S Altoona, IATIME ESTIMATED FROM RADAR.

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 6, 7:17 AM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 1.5 hours before the alert went out and 231 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, Davenport, at 12:00Z on 2012-05-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2361 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, Davenport, at 12:00Z on 2012-05-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 181 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
2361 J/kg
Mixed-layer CIN
-82 J/kg
Mixed-layer LCL
571 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
181 m²/s²
0-3 km storm-relative helicity
188 m²/s²
Significant tornado parameter
0.0
Supercell composite
9.6

Open this sounding in Storm Lab

The text

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

823 
WUUS53 KDMX 061327
SVRDMX
IAC099-125-153-181-061415-
/O.NEW.KDMX.SV.W.0079.120506T1327Z-120506T1415Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
827 AM CDT SUN MAY 6 2012

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN JASPER COUNTY IN CENTRAL IOWA...
  NORTHWESTERN MARION COUNTY IN SOUTH CENTRAL IOWA...
  SOUTHERN POLK COUNTY IN CENTRAL IOWA...
  NORTHEASTERN WARREN COUNTY IN SOUTH CENTRAL IOWA...

* UNTIL 915 AM CDT

* AT 823 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 NEAR   
  DES MOINES...AND MOVING EAST AT 35 MPH.  AT 819 AM CDT SOME ROOF   
  DAMAGE WAS REPORTED IN NORWALK WITH THIS STORM WITH WINDS          
  ESTIMATED AT 65 MPH.

* LOCATIONS IMPACTED INCLUDE...
  NEWTON...CARLISLE...PLEASANT HILL...ALTOONA...PRAIRIE CITY...
  COLFAX...MONROE...HARTFORD...RUNNELLS...SWAN...MITCHELLVILLE...
  NEWTON AIRPORT...LAMBS GROVE AND REASNOR.

THIS INCLUDES INTERSTATE 80 BETWEEN MILE MARKERS 142 AND 168.

THIS INCLUDES INTERSTATE 235 BETWEEN MILE MARKERS 3 AND 13.

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 4179 9305 4153 9290 4135 9364 4159 9374
TIME...MOT...LOC 1326Z 251DEG 29KT 4152 9356
WIND...HAIL 60MPH 1.00IN

$$

ZOGG
1 follow-up statement
137 
WWUS53 KDMX 061344
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
844 AM CDT SUN MAY 6 2012

IAC099-125-153-181-061415-
/O.CON.KDMX.SV.W.0079.000000T0000Z-120506T1415Z/
WARREN IA-POLK IA-MARION IA-JASPER IA-
844 AM CDT SUN MAY 6 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WESTERN
JASPER...NORTHWESTERN MARION...SOUTHEASTERN POLK AND NORTHEASTERN
WARREN COUNTIES UNTIL 915 AM CDT...

AT 842 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 6 MILES
NORTHEAST OF CARLISLE...OR 11 MILES EAST OF DES MOINES...MOVING EAST
AT 35 MPH.

LOCATIONS IMPACTED INCLUDE...
  NEWTON...PRAIRIE CITY...COLFAX...MONROE...SWAN...MITCHELLVILLE...
  NEWTON AIRPORT...LAMBS GROVE AND REASNOR.

THIS INCLUDES INTERSTATE 80 BETWEEN MILE MARKERS 143 AND 168.

THIS INCLUDES INTERSTATE 235 BETWEEN MILE MARKERS 10 AND 13.

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 4162 9361 4179 9305 4153 9290 4137 9355
TIME...MOT...LOC 1344Z 251DEG 29KT 4157 9338
WIND...HAIL 60MPH 1.00IN

$$

ZOGG

The office that day

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

IssuedProductOfficeCountiesLasted
May 6, 4:32 AM CDTSevere Thunderstorm WarningDMXHamilton, Wright43 min
May 6, 5:52 AM CDTSevere Thunderstorm WarningDMXAudubon, Guthrie53 min
May 6, 6:30 AM CDTSevere Thunderstorm WarningDMXAdair, Cass45 min
May 6, 7:05 AM CDTSevere Thunderstorm WarningDMXAdair, Dallas, Guthrie, Madison25 min
May 6, 7:09 AM CDTSevere Thunderstorm WarningDMXAdair, Madison22 min
May 6, 7:29 AM CDTSevere Thunderstorm WarningDMXAdair, Dallas, Guthrie, Madison31 min
May 6, 7:59 AM CDTSevere Thunderstorm WarningDMXDallas, Polk46 min
May 6, 9:03 AM CDTSevere Thunderstorm WarningDMXJasper, Marion42 min
May 6, 9:12 AM CDTSevere Thunderstorm WarningDMXJasper, Marion48 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.