Alert archive / Iowa / Flash Flood Warnings in 1993
Flash Flood Warning 68, NWS Des Moines, IA
NWS Des Moines, IA issued this flash flood warning at Jul 13, 1993, 5:46 AM CDT for Dallas County, Polk County, Iowa. It was in force for 6 hr.
The area
The counties it named.
The facts
- Issued
- Jul 13, 1993, 5:46 AM CDT (10:46 UTC)
- Expired
- Jul 13, 1993, 11:45 AM CDT
- In force
- 6 hr
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
Counties Dallas County, IA, Polk County, IA
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 10.8 hours before the alert went out and 217 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
- 42 J/kg
- Mixed-layer CIN
- -330 J/kg
- Mixed-layer LCL
- 1070 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 97 m²/s²
- 0-3 km storm-relative helicity
- 181 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KDSM 131047 FFWDSM IAC049-153-131645- BULLETIN - EBS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE DES MOINES IA 546 AM CDT TUE JUL 13 1993 THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL 1145 AM CDT FOR PEOPLE IN THE FOLLOWING LOCATION(S)S... IN CENTRAL IOWA ...DALLAS COUNTY...SOUTHERN POLK COUNTY AT 540 AM CDT...A LINE OF THUNDERSTORMS PRODUCING VERY HEAVY RAIN WAS IN WESTERN IOWA. THESE THUNDERSTORMS WERE JUST ENTERING THE RACCOON RIVER BASIN...AND WILL CAUSE A RAPID RISE ALONG THE RIVER THIS MORNING. IT IS QUITE POSSIBLE THAT...BY NOON TODAY...THIS RAINFALL WILL SEND THE RACCOON RIVER UP TO OR OVER THE RECORD CRESTS OF THIS PAST WEEKEND. THIS IS AN EXTREMELY DANGEROUS SITUATION!! IF YOU ARE ANYWHERE NEAR THE RACCOON RIVER...YOU SHOULD MOVE TO HIGHER GROUND THIS MORNING. THE FLOOD WATERS WILL BE RISING VERY QUICKLY AS THESE STORMS HEAD EAST. MOST DEATHS IN FLASH FLOODING 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. SULLIVAN
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 13, 4:41 AM CDT, 1 hour 5 minutes before
IAZALL-131040- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 441 AM CDT TUE JUL 13 1993 ...A FLASH FLOOD WATCH IS IN EFFECT FOR ALL OF IOWA TODAY AND TONIGHT... AT 430 AM CDT...SCATTERED SHOWERS AND THUNDERSTORMS...A FEW WITH VERY HEAVY RAIN...CONTINUED ACROSS WESTERN...CENTRAL AND NORTH CENTRAL IOWA. THIS RAIN AREA WAS LOCATED WEST OF A LINE EXTENDING FROM THE MINNESOTA BORDER AT ESTHERVILLE...TO 30 MILES NORTH OF AMES...TO 10 MILES EAST OF AMES...TO DENISON...TO THE MISSOURI BORDER 50 MILES WEST OF LAMONI AT BRADDYVILLE. THUNDERSTORMS WITH VERY HEAVY RAIN WERE LOCATED 20 MILES EAST OF COUNCIL BLUFFS AND 10 MILES SOUTHWEST OF SHENANDOAH. MOVEMENT WAS NORTHEAST AT 30 MILES AN HOUR. R A PRENTICE WWUS35KLBF ,B
Special weather statement, Jul 13, 4:43 AM CDT, 1 hour 3 minutes before
IAZALL-131040- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 441 AM CDT TUE JUL 13 1993 ...A FLASH FLOOD WATCH IS IN EFFECT FOR ALL OF IOWA TODAY AND TONIGHT... AT 430 AM CDT...SCATTERED SHOWERS AND THUNDERSTORMS...A FEW WITH VERY HEAVY RAIN...CONTINUED ACROSS WESTERN...CENTRAL AND NORTH CENTRAL IOWA. THIS RAIN AREA WAS LOCATED WEST OF A LINE EXTENDING FROM THE MINNESOTA BORDER AT ESTHERVILLE...TO 30 MILES NORTH OF AMES...TO 10 MILES EAST OF AMES...TO DENISON...TO THE MISSOURI BORDER 50 MILES WEST OF LAMONI AT BRADDYVILLE. THUNDERSTORMS WITH VERY HEAVY RAIN WERE LOCATED 20 MILES EAST OF COUNCIL BLUFFS AND 10 MILES SOUTHWEST OF SHENANDOAH. MOVEMENT fWAS NORTHEAST AT 30 MILES AN HOUR. R A PRENTICE
Special weather statement, Jul 13, 5:24 AM CDT, 22 minutes before
IAZ006-007-008-009-010-011-016-017-018-019-026-027-028-029-038- 039-040-131215- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 525 AM CDT TUE JUL 13 1993 ...HEAVY RAINS TO TRAVERSE ALONG I-35 EARLY THIS MORNING... A FLASH FLOOD WATCH IS IN EFFECT TODAY AND TONIGHT FOR THE ENTIRE STATE. THROUGH 7 AM AN AREA OF STORMS IS GOING TO AFFECT THE GARNER... MASON CITY...NORTHWOOD AND FOREST CITY AREAS OF NORTH CENTRAL IOWA. THESE STORMS ARE LIKELY GOING TO PRODUCE BRIEF HEAVY RAINS AND DEADLY LIGHTNING WITH THEIR PASSAGE. AS THE MORNING WEARS ON THE REST OF NORTHEAST IOWA IS EXPECTED TO SEE RAIN SPREADING IN HOWEVER AT THIS TIME IT APPEARS THAT THE MOST INTENSE RAINS ARE LIKELY GOING TO ERUPT THIS AFTERNOON AND TONIGHT WITH THE GREATEST CHANCE OF FLASH FLOODING THEN. THIS IS A DANGEROUS SITUATION AND PEOPLE ARE URGED TO MONITIOR TELEVISION...NOAA WEATHER RADIO OR COMMERCIAL RADIO FOR UPDATES ON FURTHER FLOODING DEVELOPMEN&TS. COLLAR
Special weather statement, Jul 13, 5:25 AM CDT, 21 minutes before
IAZ006-007-008-009-010-011-016-017-018-019-026-027-028-029-038- 039-040-131215- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 525 AM CDT TUE JUL 13 1993 ...HEAVY RAINS TO TRAVERSE ALONG I-35 EARLY THIS MORNING... A FLASH FLOOD WATCH IS IN EFFECT TODAY AND TONIGHT FOR THE ENTIRE STATE. THROUGH 7 AM AN AREA OF STORMS IS GOING TO AFFECT THE GARNER... MASON CITY...NORTHWOOD AND FOREST CITY AREAS OF NORTH CENTRAL IOWA. THESE STORMS ARE LIKELY GOING TO PRODUCE BRIEF HEAVY RAINS AND DEADLY LIGHTNING WITH THEIR PASSAGE. AS THE MORNING WEARS ON THE REST OF NORTHEAST IOWA IS EXPECTED TO SEE RAIN SPREADING IN HOWEVER AT THIS TIME IT APPEARS THAT THE MOST INTENSE RAINS ARE LIKELY GOING TO ERUPT THIS AFTERNOON AND TONIGHT WITH THE GREATEST CHANCE OF FLASH FLOODING THEN. THIS IS A DANGEROUS SITUATION AND PEOPLE ARE URGED TO MONITIOR TELEVISION...NOAA WEATHER RADIO OR COMMERCIAL RADIO FOR UPDATES ON FURTHER FLOODING DEVELOPMENTS. COLLAR
Special weather statement, Jul 13, 5:37 AM CDT, 9 minutes before
IAZALL-131140- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 537 AM CDT TUE JUL 13 1993 ...A FLASH FLOOD WATCH IS IN EFFECT FOR ALL OF IOWA TODAY AND TONIGHT... AT 526 AM CDT...NUMEROUS SHOWERS AND THUNDERSTORMS...SOME WITH VERY HEAVY RAIN...CONTINUED ACROSS WESTERN AND NORTH CENTRAL IOWA. THIS RAIN AREA WAS LOCATED WEST OF A LINE EXTENDING FROM THE MINNESOTA BORDER 40 MILES NORTHWEST OF MASON CITY...TO 20 MILES SOUTHEAST OF MASON CITY...TO 20 MILES WEST OF WATERLOO...TO 20 MILES SOUTH OF FORT DODGE... TO 25 MILES WEST OF DES MOINES...TO THE MISSOURI BORDER 40 MILES WEST OF LAMONI. THUNDERSTORMS WITH VERY HEAVY RAIN WERE LOCATED ACROSS SOUTHWEST IOWA...10 MILES SOUTH OF AUDUBON...10 MILES EAST OF ATLANTIC...JUST NORTH AND SOUTH OF OAKLAND AND 5 MILES SOUTHWEST OF RED OAK. MOVEMENT WAS NORTHEAST AT 40 MILES AN HOUR. ...R A PRENTICE
Special weather statement, Jul 13, 5:39 AM CDT, 7 minutes before
IAZALL-131140- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 537 AM CDT TUE JUL 13 1993 ...A FLASH FLOOD WATCH IS IN EFFECT FOR ALL OF IOWA TODAY AND TONIGHT... AT 526 AM CDT...NUMEROUS SHOWERS AND THUNDERSTORMS...SOME WITH VERY HEAVY RAIN...CONTINUED ACROSS WESTERN AND NORTH CENTRAL IOWA. THIS RAIN AREA WAS LOCATED WEST OF A LINE EXTENDING FROM THE MINNESOTA BORDER 40 MILES NORTHWEST OF MASON CITY...TO 20 MILES SOUTHEAST OF MASON CITY...TO 20 MILES WEST OF WATERLOO...TO 20 MILES SOUTH OF FORT DODGE... TO 25 MILES WEST OF DES MOINES...TO THE MISSOURI BORDER 40 MILES WEST OF LAMONI. THUNDERSTORMS WITH VERY HEAVY RAIN WERE LOCATED ACROSS SOUTHWEST IOWA...10 MILES SOUTH OF AUDUBON...10 MILES EAST OF ATLANTIC...JUST NORTH AND SOUTH OF OAKLAND AND 5 MILES SOUTHWEST OF RED OAK. MOVEMENT WAS NORTHEAST AT 40 MILES AN HOUR. ...R A PRENTICE
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 13, 6:47 AM CDT | Flash Flood Warning | DMX | Cass | 3 hr |
| Jul 13, 8:14 AM CDT | Flash Flood Warning | DMX | Polk, Story | 4 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.