Alert archive / Iowa / Flash Flood Warnings in 1993
Flash Flood Warning 85, NWS Des Moines, IA
NWS Des Moines, IA issued this flash flood warning at Jul 24, 1993, 1:56 AM CDT for Keokuk County, Washington County, Iowa. It was in force for 3 hr.
The area
The counties it named.
The facts
- Issued
- Jul 24, 1993, 1:56 AM CDT (06:56 UTC)
- Expired
- Jul 24, 1993, 5:00 AM CDT
- In force
- 3 hr
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
Counties Keokuk County, IA, Washington County, IA
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 6.9 hours before the alert went out and 369 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
- 465 J/kg
- Mixed-layer CIN
- -64 J/kg
- Mixed-layer LCL
- 966 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 65 m²/s²
- 0-3 km storm-relative helicity
- 131 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.5
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KDSM 240657 FFWDSM IAC107-183-241000- BULLETIN - EBS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE DES MOINES IA 156 AM CDT SAT JUL 24 1993 THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL 500 AM CDT FOR PEOPLE IN THE FOLLOWING LOCATION(S)S... IN SOUTHEAST IOWA ...KEOKUK COUNTY...WASHINGTON COUNTY AT 150 AM CDT...RADAR INDICATED THUNDERSTORMS PRODUCING TORRENTIAL RAINFALL OVER KEOKUK AND WASHINGTON COUNTIES. THESE COUNTIES ARE LOCATED ABOUT 30 MILES SOUTHWEST OF IOWA CITY. THE STORMS HAVE INCREASED DRAMATICALLY IN INTENSITY BETWEEN 115 AND 145 AM AND ARE CAPABLE OF PRODUCING UP TO 2 INCHES OF RAINFALL IN AN HOURS TIME. 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.
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 23, 11:45 PM CDT, 2 hours 11 minutes before
IAZ060-240445- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 11 45 PM CDT FRI JUL 23 1993 ...A FLASH FLOOD WATCH FOR THE SOUTH HALF OF IOWA FOR LATE TONIGHT INTO SATURDAY MORNING... AT 11 30 PM CDT...SCATTERED VERY STRONG AND INTENSE THUNDERSTORMS CONTINUED OVER SOUTH CENTRAL AND SOUTHEAST IOWA. THE STRONGEST STORMS WERE LOCATED 50 TO 65 MILES SOUTH OF DES MOINES...OR FROM NEAR MOUNT AYR TO 5 MILES SOUTH OF OSCEOLA. AT 11 30 PM...PEA SIZED HAIL WAS REPORTED AT KELLERTON...10 MILES EAST OF MOUNT AYR IN EASTERN RINGOLD COUNTY. ALSO...OTHER STRONG STORMS EXTENDED FROM 50 MILES EAST OF DES MOINES TO 35 MILES NORTHWEST OF BURLINGTON. THESE STORMS WERE PRODUCING VERY LARGE AMOUNTS OF RAIN AND WERE MOVING SLOWLY. THIS COMBINATION CAN PRODUCE FLOODING OF ROADS AND LOW LYING AREAS AND STREAMS. PEOPLE IN THE PATH OF THESE STORMS ARE URGED TO SEEK HIGHER GROUND. . THE THUNDERSTORMS WERE MOVING EAST AT 15 MILES AN HOUR. MILLER 1r20"WGBf6WWUS> WerDWHPN u 6WWUS xq6WWUSx T09 1RFTUEDfAH WUUSj XWOUSi, ^ `WWUS \]96WWUS ps66WWUS4 8qI`WWUS. hMWWUS w WUUS^ q WUUSp hcWP
Special weather statement, Jul 24, 12:48 AM CDT, 1 hour 8 minutes before
IAZALL-240645- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY...TYPO LINE 8 NATIONAL WEATHER SERVICE DES MOINES IA 1248 AM CDT SAT JUL 24 1993 ...A FLASH FLOOD WATCH FOR THE SOUTH HALF OF IOWA FOR LATE TONIGHT INTO SATURDAY MORNING... AT 1235 AM CDT...INTENSE THUNDERSTORMS PRODUCING EXTREMELY HEAVY RAIN...ALONG WITH SMALL HAIL AND NEARLY CONTINUOUS LIGHTNING WERE LOCATED OVER SOUTH CENTRAL IOWA...SOME 45 TO 60 MILES SOUTH OF DES MOINES...AROUND LAMONI...CORYDON AND HUMESTON. THESE ARE THE SAME AREAS THAT HAVE RECEIVED VERY HEAVY RAIN OVER THE PAST TWO DAYS. THESE STORMS WERE PART OF A LARGER AREA OF SHOWERS AND THUNDERSTORMS LOCATED ALONG AND SOUTH OF A LINE FROM CLARINDA NORTHEAST THROUGH WINTERSET TO VINTON THEN EAST TO DEWITT. CLARINDA IS 80 MILES SOUTHWEST OF DES MOINES...WINTERSET IS 20 MILES SOUTHWEST OF DES MOINES ...VINTON IS ABOUT 25 MILES NORTHWEST OF CEDAR RAPIDS WHILE DEWITT IS 20 MILES NORTH OF THE QUAD CITIES. THE SHOWERS AND STORMS WERE MOVING EAST AT 20 MILES AN HOUR. BARLOW
Special weather statement, Jul 24, 12:51 AM CDT, 1 hour 5 minutes before
IAZALL-240645- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 1248 AM CDT SAT JUL 24 1993 ...A FLASH FLOOD WATCH FOR THE SOUTH HALF OF IOWA FOR LATE TONIGHT INTO SATURDAY MORNING... AT 1235 AM CDT...INTENSE THUNDERSTORMS PRODUCING EXTREMELY HEAVY RAIN...ALONG WITH SMALL HAIL AND NEARLY CONTINUOUS LIGHTNING WERE LOCATED OVER SOUTH CENTRAL IOWA...SOME 45 TO 60 MILES SOUTH OF DES MOINES...AROUND LAMONI...CORYDON AND HUMESTON. THESE ARE THE SAME AREAS THAT HAVE RECEIVED VERY HEAVY RAIN OVER THE PAST TWO DAYS. THESE STORMS WERE PART OF A LARGER AREA OF SHOWERS AND THUNDERSTORMS LOCATED ALONG AND SOUTH OF A LINE FROM CLARINDA NORTHEAST THROUGH WINTERSET TO VINTO THEN EAST TO DEWITT. CLARINDA IS 80 MILES SOUTHWEST OF DES MOINES...WINTERSET IS 20 MILES SOUTHWEST OF DES MOINES ...VINTON IS ABOUT 25 MILES NORTHWEST OF CEDAR RAPIDS WHILE DEWITT IS 20 MILES NORTH OF THE QUAD CITIES. THE SHOWERS AND S TORMS WERE MOVING EAST AT 20 MILES AN HOUR. BARLOW
Special weather statement, Jul 24, 12:56 AM CDT, 1 hour before
IAZALL-240645- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY...TYPO LINE 8 NATIONAL WEATHER SERVICE DES MOINES IA 1248 AM CDT SAT JUL 24 1993 ...A FLASH FLOOD WATCH FOR THE SOUTH HALF OF IOWA FOR LATE TONIGHT INTO SATURDAY MORNING... AT 1235 AM CDT...INTENSE THUNDERSTORMS PRODUCING EXTREMELY HEAVY RAIN...ALONG WITH SMALL HAIL AND NEARLY CONTINUOUS LIGHTNING WERE LOCATED OVER SOUTH CENTRAL IOWA...SOME 45 TO 60 MILES SOUTH OF DES MOINES...AROUND LAMONI...CORYDON AND HUMESTON. THESE ARE THE SAME AREAS THAT HAVE RECEIVED VERY HEAVY RAIN OVER THE PAST TWO DAYS. THESE STORMS WERE PART OF A LARGER AREA OF SHOWERS AND THUNDERSTORMS LOCATED ALONG AND SOUTH OF A LINE FROM CLARINDA NORTHEAST THROUGH WINTERSET TO VINTON THEN EAST TO DEWITT. CLARINDA IS 80 MILES SOUTHWEST OF DES MOINES...WINTERSET IS 20 MILES SOUTHWEST OF DES MOINES ...VINTON IS ABOUT 25 MILES NORTHWEST OF CEDAR RAPIDS WHILE DEWITT IS 20 MILES NORTH OF THE QUAD CITIES. . THE SHOWERS AND STORMS WERE MOVING EAST AT 20 MILES AN HOUR. BARLOW
Special weather statement, Jul 24, 1:50 AM CDT, 6 minutes before
IAZALL-240745- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 150 AM CDT SAT JUL 24 1993 ...A FLASH FLOOD WATCH FOR THE SOUTH HALF OF IOWA FOR LATE TONIGHT INTO SATURDAY MORNING... AT 134 AM CDT...INTENSE THUNDERSTORMS PRODUCING EXTREMELY HEAVY WERE NOW LOCATED OVER SOUTHEAST AND EAST CENTRAL IOWA BETWEEN OTTUMWA AND CEDAR RAPIDS...NEAR WHAT CHEER...KEOTA AND WASHINGTON. ALONG WITH THIS EXTREMELY HEAVY RAIN...NEARLY CONTINUOUS DEADLY LIGHTNING AND POSSIBLY SMALL HAIL CAN BE EXPECTED WITH THESE STORMS. THESE STORMS WERE PART OF A LARGER AREA OF SHOWERS AND THUNDERSTORMS THAT WAS LOCATED OVER THE SOUTHEAST THIRD OF IOWA. THE SHOWERS AND STORMS WERE ALONG AND SOUTHEAST OF A LINE FROM THE SOUTHWEST CORNER OF IOWA NEAR HAMBURG NORTHEAST TO ABOUT 15 MILES SOUTH OF DES MOINES THEN NORTHEAST TO 10 MILES SOUTH OF DUBUQUE. THE POWERFUL THUNDERSTORMS THAT DUMPED HEAVY RAIN ON SOUTH CENTRAL IOWA HAD SUNK INTO NORTHERN MISSOURI. THE SHOWERS AND STORMS WERE MOVING EAST AT 20 MILES AN HOUR. BARLOW
Special weather statement, Jul 24, 1:53 AM CDT, 3 minutes before
IAZALL-240745- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 150 AM CDT SAT JUL 24 1993 ...A FLASH FLOOD WATCH FOR THE SOUTH HALF OF IOWA FOR LATE TONIGHT INTO SATURDAY MORNING... AT 134 AM CDT...INTENSE THUNDERSTORMS PRODUCING EXTREMELY HEAVY WERE NOW LOCATED OVER SOUTHEAST AND EAST CENTRAL IOWA BETWEEN OTTUMWA AND CEDAR RAPIDS...NEAR WHAT CHEER...KEOTA AND WASHINGTON. ALONG WITH THIS EXTREMELY HEAVY RAIN...NEARLY CONTINUOUS DEADLY LIGHTNING AND POSSIBLY SMALL HAIL CAN BE EXPECTED WITH THESE STORMS. THESE STORMS WERE PART OF A LARGER AREA OF SHOWERS AND THUNDERSTORMS THAT WAS LOCATED OVER THE SOUTHEAST THIRD OF IOWA. THE SHOWERS AND STORMS WERE ALONG AND SOUTHEAST OF A LINE FROM THE SOUTHWEST CORNER OF IOWA NEAR HAMBURG NORTHEAST TO ABOUT 15 MILES SOUTH OF DES MOINES THEN NORTHEAST TO 10 MILES SOUTH OF DUBUQUE. THE POWERFUL THUNDERSTORMS THAT DUMPED HEAVY RAIN ON SOUTH CENTRAL IOWA HAD SUvNK INTO NORTHERN MISSOURI. THE SHOWERS AND STORMS WERE MOVING EAST AT 20 MILES AN HOUR. BARLOW
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 23, 11:16 PM CDT | Flash Flood Warning | DMX | Ringgold | 3 hr |
| Jul 23, 11:43 PM CDT | Flash Flood Warning | DMX | Decatur | 3 hr |
| Jul 24, 12:33 AM CDT | Flash Flood Warning | DMX | Wayne | 3 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.