Alert archive / Iowa / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 13, NWS Des Moines, IA

March 22, 2011Dallas County, Madison County, Polk County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Mar 22, 2011, 7:14 PM CDT for Dallas County, Madison County, Polk County, Iowa. It was in force for 31 min. 5 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
Mar 22, 2011, 7:14 PM CDT (00:14 UTC)
Expired
Mar 22, 2011, 7:45 PM CDT
In force
31 min
Issued by
NWS Des Moines, IA
Area
Storm-based polygon
Hail
1.5 in
Wind
60.0 mph

Counties Dallas County, IA, Madison County, IA, Polk County, IA

The radar

The Des Moines radar (KDMX), 24 km from the middle of the area, began a volume at 00:14 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
Mar 22, 7:18 PM CDTFUNNEL CLOUD5 Nnw Des Moines, IASPOTTER WAS OUTDOORS WATCHING WATER PONDING ON THE ROAD AND LOOKED UP TO SEE A ROTATING WALL CLOUD. FUNNEL CLOUD BRIEFLY DEVELOPED THEN WENT BACK IN THE CLOUD.
Mar 22, 7:18 PM CDTHAIL 0.25Dallas Center, IA
Mar 22, 7:18 PM CDTHAIL 11 S Adel, IALOCATION ESTIMATED
Mar 22, 7:46 PM CDTHAIL 1Urbandale, IA
Mar 22, 7:48 PM CDTHAIL 1Des Moines Int Airport, IA

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
Mar 22, 2:03 PM CDTTornado WatchSPC7 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 0.2 hours before the alert went out and 206 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 2011-03-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2011-03-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -149 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
889 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
-149 m²/s²
0-3 km storm-relative helicity
-12 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

624 
WUUS53 KDMX 230014
SVRDMX
IAC049-121-153-230045-
/O.NEW.KDMX.SV.W.0013.110323T0014Z-110323T0045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
714 PM CDT TUE MAR 22 2011

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN DALLAS COUNTY IN CENTRAL IOWA...
  NORTHERN MADISON COUNTY IN SOUTH CENTRAL IOWA...
  WESTERN POLK COUNTY IN CENTRAL IOWA...

* UNTIL 745 PM CDT

* AT 710 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 NEAR EARLHAM...OR 24 MILES WEST OF DES MOINES...AND MOVING
  NORTHEAST AT 50 MPH.

* LOCATIONS IMPACTED INCLUDE...
  ADEL...DALLAS CENTER...WAUKEE...WEST DES MOINES...CLIVE...GRIMES...
  URBANDALE...WINDSOR HEIGHTS...JOHNSTON...POLK CITY...VAN METER...
  DES MOINES INT AIRPORT AND SAYLORVILLE LAKE.

THIS INCLUDES INTERSTATE 80 BETWEEN MILE MARKERS 99 AND 134.

THIS INCLUDES INTERSTATE 35 BETWEEN MILE MARKERS 67 AND 72.

THIS INCLUDES INTERSTATE 235 BETWEEN MILE MARKERS 1 AND 7.

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 4162 9419 4182 9364 4153 9363 4151 9380
      4150 9380 4142 9423
TIME...MOT...LOC 0014Z 240DEG 44KT 4155 9403
WIND...HAIL 60MPH 1.50IN

$$

DONAVON
2 follow-up statements
737 
WWUS53 KDMX 230037
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
737 PM CDT TUE MAR 22 2011

IAC121-230047-
/O.CAN.KDMX.SV.W.0013.000000T0000Z-110323T0045Z/
MADISON IA-
737 PM CDT TUE MAR 22 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN MADISON COUNTY IS
CANCELLED...

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

LAT...LON 4150 9399 4171 9395 4182 9364 4153 9363
      4150 9391
TIME...MOT...LOC 0037Z 264DEG 21KT 4159 9382

$$

IAC049-153-230045-
/O.CON.KDMX.SV.W.0013.000000T0000Z-110323T0045Z/
POLK IA-DALLAS IA-
737 PM CDT TUE MAR 22 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
DALLAS AND WESTERN POLK COUNTIES UNTIL 745 PM CDT...

AT 733 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
WAUKEE...OR 12 MILES WEST OF DES MOINES...MOVING EAST AT 25 MPH.

LOCATIONS IMPACTED INCLUDE...
  GRIMES...CLIVE...WEST DES MOINES...WINDSOR HEIGHTS...URBANDALE...
  JOHNSTON...POLK CITY...DES MOINES INT AIRPORT AND SAYLORVILLE LAKE.

THIS INCLUDES INTERSTATE 80 BETWEEN MILE MARKERS 112 AND 134.

THIS INCLUDES INTERSTATE 35 BETWEEN MILE MARKERS 68 AND 72.

THIS INCLUDES INTERSTATE 235 BETWEEN MILE MARKERS 1 AND 7.

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.

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. IF A TORNADO
IS SPOTTED... IMMEDIATELY MOVE TO THE BASEMENT OR SMALL INTERIOR ROOM
OF A REINFORCED BUILDING.

&&

LAT...LON 4150 9399 4171 9395 4182 9364 4153 9363
      4150 9391
TIME...MOT...LOC 0037Z 264DEG 21KT 4159 9382
WIND...HAIL 60MPH 1.00IN

$$

BEERENDS
342 
WWUS53 KDMX 230045
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
745 PM CDT TUE MAR 22 2011

IAC049-153-230055-
/O.EXP.KDMX.SV.W.0013.000000T0000Z-110323T0045Z/
POLK IA-DALLAS IA-
745 PM CDT TUE MAR 22 2011

THIS INCLUDES INTERSTATE 80 BETWEEN MILE MARKERS 112 AND 134.

THIS INCLUDES INTERSTATE 35 BETWEEN MILE MARKERS 68 AND 72.

THIS INCLUDES INTERSTATE 235 BETWEEN MILE MARKERS 1 AND 7.

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN DALLAS AND
WESTERN POLK COUNTIES HAS EXPIRED...

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 TORNADO 
WATCH REMAINS IN EFFECT UNTIL 9 PM CDT.

LAT...LON 4150 9399 4171 9395 4182 9364 4153 9363
      4150 9391
TIME...MOT...LOC 0037Z 264DEG 21KT 4159 9382

$$

DONAVON

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 22, 7:01 PM CDTSevere Thunderstorm WarningDMXJasper, Marshall, Polk44 min
Mar 22, 7:07 PM CDTSevere Thunderstorm WarningDMXAdams, Ringgold, Taylor, Union53 min
Mar 22, 7:09 PM CDTTornado WarningDMXClarke, Decatur, Lucas, Wayne36 min
Mar 22, 7:31 PM CDTTornado WarningDMXMadison, Warren29 min
Mar 22, 7:47 PM CDTSevere Thunderstorm WarningDMXJasper, Marshall, Poweshiek, Tama43 min
Mar 22, 7:48 PM CDTSevere Thunderstorm WarningDMXClarke, Decatur, Ringgold, Union42 min
Mar 22, 8:01 PM CDTSevere Thunderstorm WarningDMXMadison, Marion, Warren44 min
Mar 22, 8:09 PM CDTSevere Thunderstorm WarningDMXClarke, Lucas, Marion, Warren51 min
Mar 22, 8:29 PM CDTSevere Thunderstorm WarningDMXClarke, Decatur, Lucas, Wayne31 min
Mar 22, 8:41 PM CDTTornado WarningDMXDecatur, Lucas, Wayne34 min
Mar 22, 8:42 PM CDTSevere Thunderstorm WarningDMXMahaska, Marion, Warren33 min
Mar 22, 8:49 PM CDTSevere Thunderstorm WarningDMXJasper, Mahaska, Marion, Poweshiek41 min
Mar 22, 8:58 PM CDTSevere Thunderstorm WarningDMXDecatur, Wayne17 min
Mar 22, 9:07 PM CDTSevere Thunderstorm WarningDMXMahaska, Marion23 min
Mar 22, 9:12 PM CDTSevere Thunderstorm WarningDMXAppanoose, Davis, Lucas, Monroe, Wapello, Wayne48 min
Mar 22, 9:15 PM CDTTornado WarningDMXMahaska, Poweshiek30 min
Mar 22, 9:32 PM CDTSevere Thunderstorm WarningDMXMahaska, Monroe, Wapello43 min
Mar 22, 9:55 PM CDTSevere Thunderstorm WarningDMXAppanoose, Davis, Wapello50 min
Mar 23, 1:59 PM CDTRiver Flood WarningDMXBlack Hawk, Bremer, Butler68 hr

Nearby

Severe Thunderstorm Warnings in Iowa, 2011Every severe thunderstorm warning in 2011

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.