Alert archive / Iowa / Flash Flood Warnings in 1998

Flash Flood Warning 2, NWS Des Moines, IA

June 14, 1998Audubon County, Cass County, Iowa

NWS Des Moines, IA issued this flash flood warning at Jun 14, 1998, 6:32 PM CDT for Audubon County, Cass County, Iowa. It was in force for 11 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jun 14, 1998, 6:32 PM CDT (23:32 UTC)
Expired
Jun 15, 1998, 6:00 AM CDT
In force
11 hr
Issued by
NWS Des Moines, IA
Area
Whole counties

Counties Audubon County, IA, Cass County, IA

The nearest sounding before it

Topeka, KS (KTOP), launched 12:00Z, 11.5 hours before the alert went out and 286 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, Topeka, KS at 12:00Z on 1998-06-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 332 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, Topeka, KS at 12:00Z on 1998-06-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -105 square meters per square second.1939587897117Sfc1 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
332 J/kg
Mixed-layer CIN
-266 J/kg
Mixed-layer LCL
923 m above ground
0-6 km bulk shear
63 kt
0-1 km storm-relative helicity
-105 m²/s²
0-3 km storm-relative helicity
39 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.4

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KDSM 142332
FFWDSM
IAC009-029-151100-

BULLETIN - EAS ACTIVATION REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
632 PM CDT SUN JUN 14 1998

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* FLOOD WARNING FOR...
  SOUTHERN AUDUBON COUNTY IN WEST CENTRAL IOWA
  CASS COUNTY IN SOUTHWESTERN IOWA

* UNTIL 600 AM CDT

THIS WARNING HAS BEEN EXPANDED TO INCLUDE SOUTHERN AUDUBON. INTENSE
RAINS HAVE OCCURRED OVER SOUTHERN AUDUBON AND ALL OF CASS COUNTY
SINCE EARLY LAST NIGHT. ATLANTIC HAS MEASURED AROUND 13 INCHES OF
RAIN SINCE MIDNIGHT. DOPPLER RADAR HAS INDICATED AMOUNTS OF 4 TO 8
INCHES OVER THE REST OF CASS COUNTY AND MOST OF SOUTHERN AUDUBON...
SOUTH OF HIGHWAY 44. FLOODING WILL PUSH ALL CREEKS AND STREAMS OUT
OF THE THEIR BANKS BY AT LEAST 3 TO 4 FEET IF NOT MORE. COUNTY ROADS
AND HIGHWAYS WILL BE INUNDATED. HIGHWAY 71 IS BEING CLOSED IN
SOUTHERN AUDUBON.

RIVERS AFFECTED ARE...

THE UPPER REACHES OF THE EAST NISHNABOTNA INCLUDING ALL STREAMS
AND TRIBUTARIES FLOWING INTO IT. THE RIVER IS FORECAST TO REACH 22
TO 24 FEET THIS EVENING 5 MILES SOUTHWEST OF ATLANTIC. THIS IS VERY
CLOSE TO OR EXCEEDING A RECORD FLOOD. THE PREVIOUS RECORD IS 22.8
FEET WHICH OCCURRED IN 1972. WIDESPREAD AGRICULTURAL FLOODING AS
WELL AS SOME PARTS OF ATLANTIC WILL FLOOD.

THE UPPER REACHES OF THE NODAWAY WILL FLOOD AS WELL...AT LEAST BY 2
TO 4 FEET OVER BANKFULL.

ALL PERSONS LIVING NEAR OR ALONG FLOOD-PRONE AREAS SHOULD BE
PREPARED xTO MOVE TO HIGHER GROUND IMMEDIATELY. DO NOT DRIVE OVER
FLOODED ROADWAYS...SINCE THEY MAYBE WASHED OUT.

MYERS

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 14, 1:10 AM CDTSevere Thunderstorm WarningDMXAdams, Taylor35 min
Jun 14, 1:42 AM CDTSevere Thunderstorm WarningDMXAdams, Taylor33 min
Jun 14, 2:06 AM CDTSevere Thunderstorm WarningDMXRinggold, Union49 min
Jun 14, 8:56 AM CDTFlash Flood WarningDMXCass3 hr
Jun 14, 2:35 PM CDTTornado WarningDMXDavis45 min

Nearby

Flash Flood Warnings in Iowa, 1998Every flash flood warning in 1998

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.