Alert archive / Iowa / Flash Flood Warnings in 1993
Flash Flood Warning 83, NWS Des Moines, IA
NWS Des Moines, IA issued this flash flood warning at Jul 23, 1993, 11:43 PM CDT for Decatur County, Iowa. It was in force for 3 hr.
The area
The counties it named.
The facts
- Issued
- Jul 23, 1993, 11:43 PM CDT (04:43 UTC)
- Expired
- Jul 24, 1993, 2:45 AM CDT
- In force
- 3 hr
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Decatur County, IA
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 4.7 hours before the alert went out and 226 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 240444 FFWDSM IAC053-240745- BULLETIN - EBS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE DES MOINES IA 1143 PM CDT FRI JUL 23 1993 THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL 300 AM CDT FOR PEOPLE IN THE FOLLOWING LOCATION(S)... IN SOUTH CENTRAL IOWA ...DECATUR COUNTY AT 1140 PM CDT RADAR INDICATED TORRENTIAL RAIN PRODUCING THUNDERSTORMS OVER EASTERN DECATUR COUNTY NEAR GRAND RIVER...55 MILES SOUTHWEST OF DES MOINES. RAINFALL AMOUNTS IN EXCESS OF SEVERAL INCHES IN A SHORT PERIOD OF TIME ARE EXPECTED WITH THESE THUNDERSTORMS. SOME SMALL STREAMS IN THE WARNING AREA INCLUDE...JONATHAN...ELK...SHORT. SOME TOWNS INCLUDED IN THE WARNING ARE...LEON...DAVIS CITY...GARDEN GROVE...AND LAMONI. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY. MOVE TO HIGHER GROUND. BELLES
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, 9:30 PM CDT, 2 hours 13 minutes before
IAZALL-240400-
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
930 PM CDT FRI JUL 23 1993
...SHORT TERM RAINFALL OUTLOOK FOR IOWA...
AT 915 PM RADAR INDICATED NUMEROUS THUNDERSTORMS IN SOUTHEAST AND EAST
CENTRAL IOWA. STRONG THUNDERSTORMS WERE ALSO LOCATED OVER PARTS OF
SOUTHEAST NEBRASKA AND NORTHEAST KANSAS AND WERE BEGINNING TO SPREAD
INTO SOUTHWEST IOWA. IN THE NEXT HOUR EXPECT THE THUNDERSTORMS TO
CONTINUE IN EAST CENTRAL AND SOUTHEAST IOWA AND BECOME MORE NUMEROUS
OVER THE SOUTHWEST PART OF THE STATE. SOME OF THESE THUNDERSTORMS MAY
CONTAIN VERY HEAVY RAIN.
THUNDERSTORMS WILL SPREAD THROUGHOUT THE ENTIRE SOUTHERN HALF OF IOWA
IN THE NEXT FEW HOURS. THESE THUNDERSTORMS HAVE THE POTENTIAL TO PRODUCE
LARGE AMOUNTS OF RAIN IN A SHORT TIME PERIOD...THUS A FLASH FLOOD WATCH
IS IN EFFECT OVER THIS PART OF THE STATE. OVER THE NORTH HALF OF IOWA
LOOK FOR DRY CONDITIONS WITH SCATTERED SHOWERS AFTER MIDNIGHT.
.
IOWANS SHOULD CONTINUE TO MONITOR THE LATEST FORECASTS AND WEATHER
STATEMENTS. IF HEAVY RAIN PRODUCING THUNDERSTORMS OCCUR IN YOUR
AREA...BE PREPARED TO MOVE TOWARD SAFE GROUND. REMEMBER NEVER TO CROSS
A FLOODED ROADWAY IN YOUR AUTOMOBILE...IT MAY HIDE A WASHOUT.
BAILEYSpecial weather statement, Jul 23, 9:32 PM CDT, 2 hours 11 minutes before
IAZALL-240400-
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
930 PM CDT FRI JUL 23 1993
...SHORT TERM RAINFALL OUTLOOK FOR IOWA...
AT 915 PM RADAR INDICATED NUMEROUS THUNDERSTORMS IN SOUTHEAST AND EAST
CENTRAL IOWA. STRONG THUNDERSTORMS WERE ALSO LOCATED OVER PARTS OF
SOUTHEAST NEBRASKA AND NORTHEAST KANSAS AND WERE BEGINNING TO SPREAD
INTO SOUTHWEST IOWA. IN THE NEXT HOUR EXPECT THE THUNDERSTORMS TO
CONTINUE IN EAST CENTRAL AND SOUTHEAST IOWA AND BECOME MORE NUMEROUS
OVER THE SOUTHWEST PART OF THE STATE. SOME OF THESE THUNDERSTORMS MAY
CONTAIN VERY HEAVY RAIN.
THUNDERSTORMS WILL SPREAD THROUGHOUT THE ENTIRE SOUTHERN HALF OF IOWA
IN THE NEXT FEW HOURS. THESE THUNDERSTORMS HAVE THE POTENTIAL TO PRODUCE
LARGE AMOUNTS OF RAIN IN A SHORT TIME PERIOD...THUS A FLASH FLOOD WATCH
IS IN EFFECT OVER THIS PART OF THE STATE. OVER THE NORTH HALF OF IOWA
LOOK FOR DRY CONDITIONS WITH SCATTERED SHOWERS AFTER MIDNIGHT.
.
IOWANS SHOULD CONTINUE TO MONITOR THE LATEST FORECASTS AND WEATHER
STATEMENTS. IF HEAVY RAIN PRODUCING THUNDERSTORMS OCCUR IN YOUR
AREA...BE PREPARED TO MOVE TOWARD SAFE GROUND. REMEMBER NEVER TO CROSS
A FLOODED ROADWAY IN YOUR AUTOMOBILE...IT MAY HIDE A WASHOUT.
BAILEYSpecial weather statement, Jul 23, 9:43 PM CDT, 2 hours before
IAZ060-240345- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 9 44 PM CDT FRI JUL 23 1993 ...A FLASH FLOOD WATCH FOR THE SOUTHWEST QUARTER OF IOWA FOR LATE TONIGHT INTO SATURDAY MORNING... AT 9 30 PM CDT...SCATTERED STRONG THUNDERSTORMS CONTINUED OVER SOUTHEAST IOWA...MOSTLY EAST OF A MARSHALLTOWN TO OTTUMWA LINE. ALSO...ISOLATED VERY STRONG THUNDERSTORMS DEVELOPED OVER SOUTHWEST AND SOUTH CENTRAL IOWA SOUTH OF A MALVERN/CRESTON/MELCHER LINE. MALVERN IS 20 MILES SOUTH OF COUNCIL BLUFFS...CRESTON IS 50 MILES SOUTHWEST OF DES MOINES...AND MELCHER IS 30 MILES SOUTHEAST OF DES MOINES. ALL OF THESE THUNDERSTORMS COULD PRODUCE HEAVY RAIN IN A SHORT PERIOD OF TIME. PERSONS IN THE PATH OF THESE STORMS SHOULD BE PREPARED TO SEEK HIGHER GROUND IF ROADWAYS AND LOW LYING AREAS EXPERIENCE FLOODING. . THE THUNDERSTORMS WERE MOVING EAST AT 30 MILES AN HOUR. MILLER
Special weather statement, Jul 23, 9:43 PM CDT, 2 hours before
IAZ060-240345- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 9 44 PM CDT FRI JUL 23 1993 ...A FLASH FLOOD WATCH FOR THE SOUTHWEST QUARTER OF IOWA FOR LATE TONIGHT INTO SATURDAY MORNING... AT 9 30 PM CDT...SCATTERED STRONG THUNDERSTORMS CONTINUED OVER SOUTHEAST IOWA...MOSTLY EAST OF A MARSHALLTOWN TO OTTUMWA LINE. ALSO...ISOLATED VERY STRONG THUNDERSTORMS DEVELOPED OVER SOUTHWEST AND SOUTH CENTRAL IOWA SOUTH OF A MALVERN/CRESTON/MELCHER LINE. MALVERN IS 20 MILES SOUTH OF COUNCIL BLUFFS...CRESTON IS 50 MILES SOUTHWEST OF DES MOINES...AND MELCHER IS 30 MILES SOUTHEAST OF DES MOINES. ALL OF THESE THUNDERSTORMS COULD PRODUCE HEAVY RAIN IN A SHORT PERIOD OF TIME. PERSONS IN THE PATH OF THESE STORMS SHOULD BE PREPARED TO SEEK HIGHER GROUND IF ROADWAYS AND LOW LYING AREAS EXPERIENCE FLOODING. . THE THUNDERSTORMS WERE MOVING EAST AT 30 MILES AN HOUR. MILLER
Special weather statement, Jul 23, 10:45 PM CDT, 58 minutes before
IAZ060-240445- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 10 45 PM CDT FRI JUL 23 1993 ...A FLASH FLOOD WATCH FOR THE SOUTH HALF OF IOWA FOR LATE TONIGHT INTO SATURDAY MORNING... AT 10 30 PM CDT...SCATTERED VERY STRONG THUNDERSTORMS CONTINUED OVER SOUTHWEST AND SOUTHEAST IOWA. THE STRONGEST STORMS WERE LOCATED 50 MILES SOUTHEAST OF COUNCIL BLUFFS ALONG THE MISSOURI BORDER SOUTH OF CLRAINDA AND 50 TO 60 MILES SOUTHWEST OF DES MOINES NEAR DIAGONAL AND MOUNT AYR. OTHER STRONG STORMS WERE LOCATED 40 TO 70 MILES WEST OF DAVENPORT . ALL OF THESE STORMS WERE CAPABLE OF PRODUCING LARGE AMOUNTS OF RAIN IN A SHORT PERIOD OF TIME. PERSONS IN THE PATH OF THESE STORMS SHOULD MONITOR THE WEATHER SITUATION CLOSELY THROUGH LOCAL MEDIA OUTLETS AND SEEK HIGHER GROUND IF ROADWAYS AND LOW LYING AREAS BECOME INUNDATED. . THE THUNDERSTORMS WERE MOVING EAST AT 20 MILES AN HOUR. MILLER
Special weather statement, Jul 23, 10:45 PM CDT, 58 minutes before
IAZ060-240445- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 10 45 PM CDT FRI JUL 23 1993 ...A FLASH FLOOD WATCH FOR THE SOUTH HALF OF IOWA FOR LATE TONIGHT INTO SATURDAY MORNING... AT 10 30 PM CDT...SCATTERED VERY STRONG THUNDERSTORMS CONTINUED OVER SOUTHWEST AND SOUTHEAST IOWA. THE STRONGEST STORMS WERE LOCATED 50 MILES SOUTHEAST OF COUNCIL BLUFFS ALONG THE MISSOURI BORDER SOUTH OF CLRAINDA AND 50 TO 60 MILES SOUTHWEST OF DES MOINES NEAR DIAGONAL AND MOUNT AYR. OTHER STRONG STORMS WERE LOCATED 40 TO 70 MILES WEST OF DAVENPORT . ALL OF THESE STORMS WERE CAPABLE OF PRODUCING LARGE AMOUNTS OF RAIN IN A SHORT PERIOD OF TIME. PERSONS IN THE PATH OF THESE STORMS SHOULD MONITOR THE WEATHER SITUATION CLOSELY THROUGH LOCAL MEDIA OUTLETS AND SEEK HIGHER GROUND IF ROADWAYS AND LOW LYING AREAS BECOME INUNDATED. . THE THUNDERSTORMS WERE MOVING EAST AT 20 MILES AN HOUR. MILLER
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 24, 12:33 AM CDT | Flash Flood Warning | DMX | Wayne | 3 hr |
| Jul 24, 1:56 AM CDT | Flash Flood Warning | DMX | Keokuk, Washington | 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.