Alert archive / Iowa / Flash Flood Warnings in 1993
Flash Flood Warning 69, NWS Des Moines, IA
NWS Des Moines, IA issued this flash flood warning at Jul 13, 1993, 6:47 AM CDT for Cass County, Iowa. It was in force for 3 hr.
The area
The counties it named.
The facts
- Issued
- Jul 13, 1993, 6:47 AM CDT (11:47 UTC)
- Expired
- Jul 13, 1993, 9:45 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 00:00Z, 11.8 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
- 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 131147 FFWDSM IAC029-131445- BULLETIN - EBS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE DES MOINES IA 647 AM CDT TUE JUL 13 1993 THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL 1000 AM CDT FOR PEOPLE IN THE FOLLOWING LOCATION(S)... IN SOUTHWEST IOWA ...CASS COUNTY AT 640 AM CDT...NATIONAL WEATHER SERVICE RADAR SHOWED THUNDERSTORMS PRODUCING VERY HEAVY RAIN 50 MILES EAST OF OMAHA/COUNCIL BLUFFS...OVER MUCH OF CASS COUNTY. RAINFALL IN THE 1 TO 1.50 INCH RANGE HAS FALLEN FROM THUNDERSTORMS TO THE WEST OF THIS AREA THIS MORNING...AND AT LEAST THIS MUCH IS LIKELY FROM THE STORMS OVER CASS COUNTY THIS MORNING. IF YOU ARE NEAR THE NISHNABOTNA RIVER...THE NODAWAY RIVER...OR SEVEN MILE CREEK IN CASS COUNTY...YOU SHOULD MOVE TO HIGHER GROUND IMMEDIATELY! 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. 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, 5:24 AM CDT, 1 hour 23 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, 1 hour 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 DEVELOPMENTS. COLLAR
Special weather statement, Jul 13, 5:37 AM CDT, 1 hour 10 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, 1 hour 8 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, 6:43 AM CDT, 4 minutes before
IAZALL-131240- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 643 AM CDT TUE JUL 13 1993 ...A FLASH FLOOD WATCH IS IN EFFECT FOR ALL OF IOWA TODAY AND TONIGHT... AT 632 AM CDT...NUMEROUS SHOWERS AND THUNDERSTORMS...MANY WITH VERY HEAVY RAIN...CONTINUED ACROSS THE NORTHWEST HALF OF IOWA. THIS RAIN AREA WAS LOCATED NORTHWEST OF A LINE EXTENDING FROM THE MINNESOTA BORDER 60 MILES NORTH OF WATERLOO...TO 30 MILES NORTH OF WATERLOO...TO DES MOINES...TO THE MISSOURI BORDER 50 MILES WEST OF LAMONI AT BRADDYVILLE. THE HEAVIEST RAINS WERE FALLING ACROSS SOUTHWEST IOWA. MOVEMENT WAS NORTHEAST AT 40 MILES AN HOUR. R A PRENTICE
Special weather statement, Jul 13, 6:45 AM CDT, 2 minutes before
IAZALL-131240- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 643 AM CDT TUE JUL 13 1993 ...A FLASH FLOOD WATCH IS IN EFFECT FOR ALL OF IOWA TODAY AND TONIGHT... AT 632 AM CDT...NUMEROUS SHOWERS AND THUNDERSTORMS...MANY WITH VERY HEAVY RAIN...CONTINUED ACROSS THE NORTHWEST HALF OF IOWA. THIS RAIN AREA WAS LOCATED NORTHWEST OF A LINE EXTENDING FROM THE MINNESOTA BORDER 60 MILES NORTH OF WATERLOO...TO 30 MILES NORTH OF WATERLOO...TO DES MOINES...TO THE MISSOURI BORDER 50 MILES WEST OF LAMONI AT BRADDYVILLE. THE HEAVIEST RAINS WERE FALLING ACROSS SOUTHWEST IOWA. 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, 5:46 AM CDT | Flash Flood Warning | DMX | Dallas, Polk | 6 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.