Alert archive / Iowa / Flash Flood Warnings in 2001

Flash Flood Warning 14, NWS Des Moines, IA

August 3, 2001Calhoun County, Pocahontas County, Sac County, Iowa

NWS Des Moines, IA issued this flash flood warning at Aug 3, 2001, 5:49 AM CDT for Calhoun County, Pocahontas County, Sac County, Iowa. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued
Aug 3, 2001, 5:49 AM CDT (10:49 UTC)
Expired
Aug 3, 2001, 11:45 AM CDT
In force
6 hr
Issued by
NWS Des Moines, IA
Area
Whole counties; the outline is the Mesonet’s reconstruction

Counties Calhoun County, IA, Pocahontas County, IA, Sac County, IA

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 10.8 hours before the alert went out and 188 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 2001-08-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3899 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 2001-08-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 25 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
3899 J/kg
Mixed-layer CIN
-69 J/kg
Mixed-layer LCL
1146 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
25 m²/s²
0-3 km storm-relative helicity
77 m²/s²
Significant tornado parameter
0.3
Supercell composite
2.3

Open this sounding in Storm Lab

The text

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

000 
WGUS53 KDMX 031052
FFWDMX
IAC025-151-161-031650-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
549 AM CDT FRI AUG 3 2001

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  POCAHONTAS COUNTY IN NORTHWEST IOWA
  CALHOUN COUNTY IN WEST CENTRAL IOWA
  SAC COUNTY IN WEST CENTRAL IOWA

* UNTIL 1145 AM CDT

* AT 545 AM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  THUNDERSTORMS WITH FLASH FLOOD PRODUCING RAINS MOVING INTO THE WARNED AREA.
  THESE STORMS WILL MOVE INTO SAC...POCAHONTAS...AND CALHOUN
  COUNTIES BETWEEN 6:15 AND 7:30 AM.

  WARNING LOCATIONS INCLUDE LAKE VIEW...MANSON...ODEBOLT...
  POCAHONTAS...ROCKWELL CITY AND SAC CITY

* THE GROUND IS ALREADY SATURATED BY RAINFALL IN THE WARNING AREA...
  AND ADDITIONAL RAIN WILL PRODUCE SIGNIFICANT RUNOFF INTO SWOLLEN
  WATERWAYS. THUNDERSTORMS IN THE AREA ARE EXPECTED TO PRODUCE
  RAINFALL RATES 1 TO 3 INCHES PER HOUR. THIS WILL PRODUCE FLASH
  FLOODING ALONG THE LIZARD CREEK...CEDAR AND LITTLE
  CEDAR CREEK...CAMP CREEK...WEST CREEK...LAKE CREEK...INDIAN
  CREEK...AND ODEBOLT CREEK.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY.

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 4287 9525 4226 9533 4229 9440 4290 9450

KULA

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 3, 5:02 AM CDTFlash Flood WarningDMXDavis4 hr
Aug 3, 6:06 AM CDTFlash Flood WarningDMXWapello3 hr
Aug 3, 7:01 AM CDTSevere Thunderstorm WarningDMXGreene39 min
Aug 3, 8:50 AM CDTFlash Flood WarningDMXAppanoose, Davis, Monroe, Wapello4 hr

Nearby

Flash Flood Warnings in Iowa, 2001Every flash flood warning in 2001

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.