Alert archive / Iowa / Flash Flood Warnings in 2002

Flash Flood Warning 13, NWS Des Moines, IA

May 29, 2002Dallas County, Iowa

NWS Des Moines, IA issued this flash flood warning at May 29, 2002, 6:29 PM CDT for Dallas County, Iowa. It was in force for 18 hr. 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 29, 2002, 6:29 PM CDT (23:29 UTC)
Expired
May 30, 2002, 12:30 PM CDT
In force
18 hr
Issued by
NWS Des Moines, IA
Area
Counties, with a storm outline in the text

County Dallas County, IA

The radar

The Des Moines radar (KDMX), 23 km from the middle of the area, began a volume at 23:32 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 12:00Z, 11.5 hours before the alert went out and 203 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 2002-05-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 598 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 12:00Z on 2002-05-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 119 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
598 J/kg
Mixed-layer CIN
-149 J/kg
Mixed-layer LCL
1020 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
119 m²/s²
0-3 km storm-relative helicity
186 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.1

Open this sounding in Storm Lab

The text

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

000 
WGUS53 KDMX 292329
FFWDSM
IAC049-300530-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
629 PM CDT WED MAY 29 2002

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  DALLAS COUNTY IN CENTRAL IOWA

  INCLUDING THE FOLLOWING LOCATIONS...
  ADEL...BOUTON...DALLAS CENTER...DAWSON...DE SOTO...MINBURN...
  PERRY...REDFIELD...VAN METER...WAUKEE AND WOODWARD

* UNTIL 1230 AM

* AT 622 PM...EMERGENCY MANAGEMENT REPORTED FLASH FLOODING IN DALLAS CENTER AND
  ALONG HIGHWAY 44. WATER UP TO HEADLIGHTS OF CARS HAS BEEN REPORTED.

* RAINFALL OF 2 TO 4 INCHES WITHIN THE PAST TWO HOURS HAS BEEN REPORTED AND
  ESTIMATED BY RADAR.

MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES...ESPECIALLY AT NIGHT.
DO NOT ATTEMPT TO CROSS BRIDGES...DIPS...OR OTHER LOW SPOTS IF WATER
COVERS THE ROADWAY.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA...LIVING NEAR THE AFFECTED
WATERWAYS...YOU SHOULD TAKE IMMEDIATE PRECAUTIONS TO PROTECT LIFE AND
PROPERTY.

LAT...LON 4187 9382 4151 9381 4151 9425 4185 9427

CORRIGAN

The office that day

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

IssuedProductOfficeCountiesLasted
May 29, 4:05 PM CDTFlash Flood WarningDMXMahaska6 hr
May 29, 6:29 PM CDTFlash Flood WarningDMXDallas6 hr

Nearby

Flash Flood Warnings in Iowa, 2002Every flash flood warning in 2002

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.