Alert archive / Iowa / Flash Flood Warnings in 1993

Flash Flood Warning 30, NWS Des Moines, IA

June 24, 1993Washington County, Iowa

NWS Des Moines, IA issued this flash flood warning at Jun 24, 1993, 9:08 PM CDT for Washington County, Iowa. It was in force for 68 min.

The area

The counties it named.

The facts

Issued
Jun 24, 1993, 9:08 PM CDT (02:08 UTC)
Expired
Jun 24, 1993, 10:16 PM CDT
In force
68 min
Issued by
NWS Des Moines, IA
Area
Whole counties

County Washington County, IA

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 2.1 hours before the alert went out and 388 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 1993-06-25Temperature 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 1993-06-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -4 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1945 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
-4 m²/s²
0-3 km storm-relative helicity
162 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.

000 
TTAA00 KDSM 250209
FFWDSM
IAC183-250400-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
908 PM CDT THU JUN 24 1993
 
THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL 1100 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION(S)...
 
IN SOUTHEAST IOWA
 
   ...WASHINGTON COUNTY
 
AT 905 PM...FLASH FLOODING HAD CLOSED OLD HIGHWAY 19 NORTH OF AINSWORTH
...45 MILES SOUTH OF CEDAR RAPIDS...ALONG THE GOOSE CREEK. THE CREEK WAS
REPORTED OUT OF ITS BANKS BY THE WASHINGTON COUNTY SHERIFF'S OFFICE.
THUNDERSTORMS...PRODUCING HEAVY RAIN WERE MOVING ACROSS WASHINGTON
COUNTY AT 905 PM.   ADDITIONAL FLASH FLOODING IS LIKELY.
 
 
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE
THE DANGERS OF FLOODS AND FLASH FLOODS.  IF FLASH FLOODING IS
OBSERVED...ACT QUICKLY.  MOVE UP TO ESCAPE FLOOD WATERS.  DO
NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.
 
A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS
IMMINENT.  MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES.  DO NOT
ATTEMPT TO CROSS BRIDGES...DIPS...OR LOW SPOTS IF WATER COVERS
THE ROADWAY.  NEVER TRY TO CROSS A FLOWING STREAM...EVEN A SMALL
ONE...ON FOOT.  TO ESCAPE RISING WATER MOVE UP TO HIGHER GROUND.
 
 
JOHNSON
 
&

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Jun 24, 8:40 PM CDT, 28 minutes before
IAZALL-250245-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE DES MOINES IA
840 PM CDT THU JUN 24 1993

AT 830 PM CDT...NUMEROUS SHOWERS AND THUNDERSTORMS WITH HEAVY RAINS
CONTINUED OVER EAST CENTRAL AND SOUTHEAST IOWA.  THE STORMS WERE SOUTH
EAST OF A LINE EXTENDING FROM LAMONI TO JUST NORTH OF DUBUQUE.  THE
HEAVIEST RAINS WERE LOCATED ALONG A LINE ABOUT 15 MILES WIDE AND
EXTENDING FROM CEDAR RAPIDS SOUTHEAST TO JUST EAST OF OTTUMWA.

THE SHOWERS AND STORMS WERE MOVING NORTHEAST AT 30 MILES AN HOUR.

SCOTT
Special weather statement, Jun 24, 8:44 PM CDT, 24 minutes before
IAZALL-250245-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE DES MOINES IA
840 PM CDT THU JUN 24 1993

AT 830 PM CDT...NUMEROUS SHOWERS AND THUNDERSTORMS WITH HEAVY RAINS
CONTINUED OVER EAST CENTRAL AND SOUTHEAST IOWA.  THE STORMS WERE SOUTH
EAST OF A LINE EXTENDING FROM LAMONI TO JUST NORTH OF DUBUQUE.  THE
HEAVIEST RAINS WERE LOCATED ALONG A LINE ABOUT 15 MILES WIDE AND
EXTENDING FROM CEDAR RAPIDS SOUTHEAST TO JUST EAST OF OTTUMWA.

THE SHOWERS AND STORMS WERE MOVING NORTHEAST AT 30 MILES AN HOUR.

SCOTT

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 24, 10:24 PM CDTFlash Flood WarningDMXVan Buren3 hr

Nearby

Flash Flood Warnings in Iowa, 1993Every flash flood warning in 1993

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.