Alert archive / Iowa / Flash Flood Warnings in 1998
Flash Flood Warning 26, NWS Des Moines, IA
NWS Des Moines, IA issued this flash flood warning at Jul 5, 1998, 8:54 AM CDT for Cass County, Iowa. It was in force for 3 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
- Jul 5, 1998, 8:54 AM CDT (13:54 UTC)
- Expired
- Jul 5, 1998, 11:50 AM CDT
- In force
- 3 hr
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Cass County, IA
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 1.9 hours before the alert went out and 120 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 960 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- -62 m²/s²
- 0-3 km storm-relative helicity
- 261 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.9
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KDSM 051354 FFWDSM IAC029-051650- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE DES MOINES IA 854 AM CDT SUN JUL 5 1998 THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A * FLASH FLOOD WARNING FOR... CASS COUNTY IN SOUTHWESTERN IOWA * UNTIL 1150 AM CDT * AT 800 AM CDT... REPORTS INDICATED A THUNDERSTORM WITH VERY HEAVY RAINS MOVING THROUGH WEST CENTRAL IOWA ... MOVING EAST AT 10 TO 15 MPH. * HEAVY RAINS...TWO INCHES SINCE 800 AM...WITH TOTALS AROUND THREE INCH HAVE BEEN REPORTED IN ATLANTIC BY THE RADIO STATION. THESE HEAVY RAINS WILL PRODUCE FLOODING IN THE COUNTY OF SMALL STREAMS AND CREEKS. THE WILL BE A SLOWER REACTION ON THE EAST NISHNABTONA RIVER. SOME STREAMS AFFECTED INCLUDE... TURKEY CREEK TROUBLESOME CREEK SPRING CREEK CROOKED CREEK DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD! FORSTER
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, Jul 5, 5:44 AM CDT, 3 hours 10 minutes before
IAZ070-071-081>085-092>096-061100- CENTRAL IOWA THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE DES MOINES IA 544 AM CDT SUN JUL 5 1998 HAZARD--CLUSTERS OF NON-SEVERE THUNDERSTORMS PRODUCING HEAVY RAIN. AREA OF CONCERN AND TIMING DETAILS--WEST OF I-35 TODAY AND ENTIRE AREA OF RESPONSIBILITY TONIGHT. METEOROLOGICAL COMMENTS--A STATIONARY FRONT LOCATED ALONG THE KANSAS/NEBRASKA BORDER INTO NORTHERN MISSOURI WILL PROVIDE A FOCUSING MECHANISM FOR THUNDERSTORMS IN EASTERN NEBRASKA...WHICH ARE MOVING INTO WESTERN IOWA. MOVEMENT OF THE THUNDERSTORMS IS LESS THAN 20 MPH WITH STORMS TRAILING AFTER EACH OTHER. RAINFALL AMOUNTS AROUND 1 INCH PER HOUR ARE LIKELY...A FEW MAY PRODUCE 1-2 INCH RAINS PER HOUR. THE AREA OF STORMS IN WESTERN IOWA SHOULD SHRINK AFTER 8 OR 9 AM WITH NEW DEVELOPMENT EXPECTED NEAR THE MISSOURI RIVER LATER TODAY. A LARGE THUNDERSTORM COMPLEX IS THEN EXPECTED IN IOWA TONIGHT WITH ADDITIONAL RAINS. PRECAUTIONS--PERSO\NS WITH INTERESTS ON SMALL STREAMS AND FLOOD-PRONE AREAS SHOULD STAY ALERT TO THE LATEST FORECASTS CONCERNING HEAVY RAINFALL. MYERS
Special weather statement, Jul 5, 5:44 AM CDT, 3 hours 10 minutes before
IAZ070-071-081>085-092>096-061100- CENTRAL IOWA THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE DES MOINES IA 544 AM CDT SUN JUL 5 1998 HAZARD--CLUSTERS OF NON-SEVERE THUNDERSTORMS PRODUCING HEAVY RAIN. AREA OF CONCERN AND TIMING DETAILS--WEST OF I-35 TODAY AND ENTIRE AREA OF RESPONSIBILITY TONIGHT. METEOROLOGICAL COMMENTS--A STATIONARY FRONT LOCATED ALONG THE KANSAS/NEBRASKA BORDER INTO NORTHERN MISSOURI WILL PROVIDE A FOCUSING MECHANISM FOR THUNDERSTORMS IN EASTERN NEBRASKA...WHICH ARE MOVING INTO WESTERN IOWA. MOVEMENT OF THE THUNDERSTORMS IS LESS THAN 20 MPH WITH STORMS TRAILING AFTER EACH OTHER. RAINFALL AMOUNTS AROUND 1 INCH PER HOUR ARE LIKELY...A FEW MAY PRODUCE 1-2 INCH RAINS PER HOUR. THE AREA OF STORMS IN WESTERN IOWA SHOULD SHRINK AFTER 8 OR 9 AM WITH NEW DEVELOPMENT EXPECTED NEAR THE MISSOURI RIVER LATER TODAY. A LARGE THUNDERSTORM COMPLEX IS THEN EXPECTED IN IOWA TONIGHT WITH ADDITIONAL RAINS. PRECAUTIONS--PERSO\NS WITH INTERESTS ON SMALL STREAMS AND FLOOD-PRONE AREAS SHOULD STAY ALERT TO THE LATEST FORECASTS CONCERNING HEAVY RAINFALL. MYERS
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.