Alert archive / Iowa / Flash Flood Warnings in 1993
Flash Flood Warning 80, NWS Des Moines, IA
NWS Des Moines, IA issued this flash flood warning at Jul 22, 1993, 8:27 PM CDT for Cass County, Iowa. It was in force for 3 hr.
The area
The counties it named.
The facts
- Issued
- Jul 22, 1993, 8:27 PM CDT (01:27 UTC)
- Expired
- Jul 22, 1993, 11:30 PM 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, 1.5 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
- 2002 J/kg
- Mixed-layer CIN
- -25 J/kg
- Mixed-layer LCL
- 664 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 78 m²/s²
- 0-3 km storm-relative helicity
- 160 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 3.5
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KDSM 230128 FFWDSM IAC029-230430- BULLETIN - EBS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE DES MOINES IA 827 PM CDT THU JUL 22 1993 THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL 1130 PM CDT FOR PEOPLE IN THE FOLLOWING LOCATION(S)... IN SOUTHWEST IOWA ...CASS COUNTY AT 820 PM CDT THUNDERSTORMS WITH HEAVY RAINS WERE OCCURRING IN CASS COUNTY. REPORTS OF NEARLY THREE INCHES...STREET FLOODING IN GRISWOLD. CREEKS AFFECTED BY THE HEAVY RAINS WERE SEVEN MILE...WALNUT AND THE NODAWAY RIVER BETWEEN MASSENA SOUTHWEST TOWARD GRANT IN NORTHEASTERN MONTGOMERY COUNTY. THUNDERSTORMS WILL CONTINUE TO MOVE OVER THE COUNTY AND CAUSE MORE FLOODING DURING THE EVENING HOURS. BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLOODS AND FLASH FLOODS. IF FLASH FLOODING IS OBSERVED...ACT QUICKLY. MOVE UP TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING. 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. FORSTER/JM
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 22, 6:44 PM CDT, 1 hour 43 minutes before
IAZ060-230040- RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 645 PM CDT THU JUL 22 1993 ...A FLASH FLOOD WATCH IS IN EFFECT FOR THE SOUTHWEST THIRD OF IOWA TONIGHT... AT 630 PM CDT...SCATTERED VERY STRONG AND INTENSE THUNDERSTORMS HAD DEVELOPED OVER SOUTHWEST IOWA. THESE STORMS WERE LOCATED 25 TO 30 MILES EAST OF COUNCIL BLUFFS NEAR THE COMMUNITY OF OAKLAND...AND 25 MILES SOUTHEAST OF COUNCIL BLUFFS NEAR THE COMMUNITY OF MALVERN. THESE THUNDERSTORMS CONTAIN VERY HEAVY RAINS AND ARE CAPABLE OF PRODUCING SMALL HAIL...STRONG WIND...AND DEADLY LIGHTNING. ALSO...WIDELY SCATTERED SHOWERS WERE OCCURRING OVER CENTRAL IOWA NEAR WINTERSET...ADAIR...AND PERRY...OR 20 TO 40 MILES SOUTLHWEST THROUGH NORTHWEST OF DES MOINES. . MILLER
Special weather statement, Jul 22, 6:45 PM CDT, 1 hour 42 minutes before
IAZ060-230040- RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 645 PM CDT THU JUL 22 1993 ...A FLASH FLOOD WATCH IS IN EFFECT FOR THE SOUTHWEST THIRD OF IOWA TONIGHT... AT 630 PM CDT...SCATTERED VERY STRONG AND INTENSE THUNDERSTORMS HAD DEVELOPED OVER SOUTHWEST IOWA. THESE STORMS WERE LOCATED 25 TO 30 MILES EAST OF COUNCIL BLUFFS NEAR THE COMMUNITY OF OAKLAND...AND 25 MILES SOUTHEAST OF COUNCIL BLUFFS NEAR THE COMMUNITY OF MALVERN. THESE THUNDERSTORMS CONTAIN VERY HEAVY RAINS AND ARE CAPABLE OF PRODUCING SMALL HAIL...STRONG WIND...AND DEADLY LIGHTNING. ALSO...WIDELY SCATTERED SHOWERS WERE OCCURRING OVER CENTRAL IOWA NEAR WINTERSET...ADAIR...AND PERRY...OR 20 TO 40 MILES SOUTHWEST THROUGH NORTHWEST OF DES MOINES. . MILLER
Special weather statement, Jul 22, 6:47 PM CDT, 1 hour 40 minutes before
IAZ060-230040- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY...CORRECT FOR HEADING NATIONAL WEATHER SERVICE DES MOINES IA 647 PM CDT THU JUL 22 1993 ...A FLASH FLOOD WATCH IS IN EFFECT FOR THE SOUTHWEST THIRD OF IOWA TONIGHT... AT 630 PM CDT...SCATTERED VERY STRONG AND INTENSE THUNDERSTORMS HAD DEVELOPED OVER SOUTHWEST IOWA. THESE STORMS WERE LOCATED 25 TO 30 MILES EAST OF COUNCIL BLUFFS NEAR THE COMMUNITY OF OAKLAND...AND 25 MILES SOUTHEAST OF COUNCIL BLUFFS NEAR THE COMMUNITY OF MALVERN. THESE THUNDERSTORMS CONTAIN VERY HEAVY RAINS AND ARE CAPABLE OF PRODUCING SMALL HAIL...STRONG WIND...AND DEADLY LIGHTNING. ALSO...WIDELY SCATTERED SHOWERS WERE OCCURRING OVER CENTRAL IOWA NEAR WINTERSET...ADAIR...AND PERRY...OR 20 TO 40 MILES SOUTHWEST THROUGH NORTHWEST OF DES MOINES. . THE THUNDERSTORMS AND SHOWERS WERE MOVING EAST/NORTHEAST AT 15 MILES AN HOUR. MILLER
Special weather statement, Jul 22, 6:48 PM CDT, 1 hour 39 minutes before
IAZ060-230040- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY...CORRECT FOR HEADING NATIONAL WEATHER SERVICE DES MOINES IA 647 PM CDT THU JUL 22 1993 ...A FLASH FLOOD WATCH IS IN EFFECT FOR THE SOUTHWEST THIRD OF IOWA TONIGHT... AT 630 PM CDT...SCATTERED VERY STRONG AND INTENSE THUNDERSTORMS HAD DEVELOPED OVER SOUTHWEST IOWA. THESE STORMS WERE LOCATED 25 TO 30 MILES EAST OF COUNCIL BLUFFS NEAR THE COMMUNITY OF OAKLAND...AND 25 MILES SOUTHEAST OF COUNCIL BLUFFS NEAR THE COMMUNITY OF MALVERN. THESE THUNDERSTORMS CONTAIN VERY HEAVY RAINS AND ARE CAPABLE OF PRODUCING SMALL HAIL...STRONG WIND...AND DEADLY LIGHTNING. ALSO...WIDELY SCATTERED SHOWERS WERE OCCURRING OVER CENTRAL IOWA NEARZ WINTERSET...ADAIR...AND PERRY...OR 20 TO 40 MILES SOUTHWEST THROUGH NORTHWEST OF DES MOINES. . THE THUNDERSTORMS AND SHOWERS WERE MOVING EAST/NORTHEAST AT 15 MILES AN HOUR. MILLER
Special weather statement, Jul 22, 7:45 PM CDT, 42 minutes before
IAZ060-230145- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 745 PM CDT THU JUL 22 1993 ...A FLASH FLOOD WATCH IS IN EFFECT FOR THE SOUTHWEST THIRD OF IOWA TONIGHT... AT 731 PM CDT...A LINE OF VERY STRONG AND INTENSE THUNDERSTORMS CONTINUED OVER SOUTHWEST IOWA. THIS 10 TO 15 MILE WIDE BAND OF STORMS WAS LOCATED FROM 50 MILES NORTHEAST OF COUNCIL BLUFFS...NEAR EXIRA...TO 35 MILES SOUTH OF COUNCIL BLUFFS...NEAR NEBRASKA CITY NEBRASKA. THESE STORMS WERE PRODUCING VERY HEAVY RAINFALL...DEADLY LIGHTNING... AND COULD PRODUCE HAIL AND DAMAGING WIND. PERSONS IN THE PATH OF THESE STORMS SHOULD MONITOR LOCAL NEWS OUTLETS AND BE ALERT TO THREATENING WEATHER. THE THUNDERSTORMS WERE MOVING EAST/NORTHEAST AT 15 TO 20 MILES AN HOUR. . MILLER
Special weather statement, Jul 22, 7:46 PM CDT, 41 minutes before
IAZ060-230145- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 745 PM CDT THU JUL 22 1993 ...A FLASH FLOOD WATCH IS IN EFFECT FOR THE SOUTHWEST THIRD OF IOWA TONIGHT... AT 731 PM CDT...A LINE OF VERY STRONG AND INTENSE THUNDERSTORMS CONTINUED OVER SOUTHWEST IOWA. THIS 10 TO 15 MILE WIDE BAND OF STORMS WAS LOCATED FROM 50 MILES NORTHEAST OF COUNCIL BLUFFS...NEAR EXIRA...TO 35 MILES SOUTH OF COUNCIL BLUFFS...NEAR NEBRASKA CITY NEBRASKA. THESE STORMS WERE PRODUCING VERY HEAVY RAINFALL...DEADLY LIGHTNING... AND COULD PRODUCE HAIL AND DAMAGING WIND. PERSONS IN THE PATH OF THESE STORMS SHOULD MONITOR LOCAL NEWS OUTLETS AND BE ALERT TO THREATENING WEATHER. THE THUNDERSTORMS WERE MOVING EAST/NORTHEAST AT 15 TO 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, 2:08 AM CDT | Flash Flood Warning | DMX | Taylor | 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.