Alert archive / Iowa / Flash Flood Warnings in 1992
Flash Flood Warning 6, NWS Des Moines, IA
NWS Des Moines, IA issued this flash flood warning at Jul 30, 1992, 3:24 AM CDT for Mahaska County, Iowa. It was in force for 2 hr.
The area
The counties it named.
The facts
- Issued
- Jul 30, 1992, 3:24 AM CDT (08:24 UTC)
- Expired
- Jul 30, 1992, 5:30 AM CDT
- In force
- 2 hr
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Mahaska County, IA
The nearest sounding before it
Omaha, NE (KOVN), launched 00:00Z, 8.4 hours before the alert went out and 311 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
- 2191 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 729 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 46 m²/s²
- 0-3 km storm-relative helicity
- 204 m²/s²
- Significant tornado parameter
- 1.8
- Supercell composite
- 9.8
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KDSM 300826 FFWDSM IAC123-301030- BULLETIN - EBS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE DES MOINES IA 324 AM CDT THU JUL 30 1992 THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL 530 AM CDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN SOUTH CENTRAL IOWA ...MAHASKA COUNTY AT 312 AM...THE MAHASKA COUNTY SHERIFF REPORTED WATER OVER HIGHWAY 163 IN SEVERAL PLACES WEST OF OSKALOOSA OR ABOUT 50 MILES TO THE SOUTHEAST OF DES MOINES. IN ADDITION...SEVERAL CREEKS WERE OUT OF THEIR BANKS NEAR HIGHWAY 92 WEST OF OSKALOOSA. PERIODS OF SHOWERS AND THUNDERSTORMS WITH HEAVY RAINFALL WILL CONTINUE MOVING ACROSS THE MAKASKA COUNTY AREA UNTIL 5AM. 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. DO NOT DRIVE YOUR VEHICLE WHERE WATER COVERS THE ROADWAY OF UNKNOWN DEPTH. ONLY TWO FEET OF WATER WILL LIFT MOST VEHICLES AND SWEEP THEM AWAY. CEW
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 29, 11:14 PM CDT, 4 hours 10 minutes before
IAZALL-300510- SPECIAL WEATHER STATEMENT AND WEATHER UPDATE FOR IOWA NATIONAL WEATHER SERVICE DES MOINES IA 1115 PM CDT WED JUL 29 1992 ...SEVERE THUNDERSTORM WATCH IN EFFECT FOR A SMALL PART OF SOUTH CENTRAL AND SOUTHWEST IOWA UNTIL 1 AM CDT THURSDAY MORNING... AT 1108 PM CDT...AN INTENSE THUNDERSTORM WAS OCCURRING OVER SOUTHWEST IOWA...35 TO 40 MILES SOUTHEAST OF COUNCIL BLUFFS OR 10 MILES NORTHEAST OF RED OAK. THIS THUNDERSTORM WAS CAPABLE OF PRODUCING HAIL...STRONG WIND...DANGEROUS LIGHTNING...AND HEAVY DOWNPOURS. PERSONS NEAR THIS STORM SHOULD SEEK SHELTER AND MONITOR WEATHER REPORTS FOR FURTHER DEVELOPMENTS. ALSO...ISOLATED STRONG THUNDERSTORMS WERE OCCURRING OVER SOUTH CENTRAL AND SOUTHEAST IOWA. ONE AREA OF STORMS WAS 50 TO 60 MILES SOUTH OF DES MOINES...NEAR LAMONI. ANOTHER AREA OF STORMS WAS 25 TO 45 MILES NORTH- WEST OF BURLINGTON NEAR BRIGHTON AND MOUNT PLEASANT. / THE STORMS WERE MOVING SOUTHEAST AT 35 MILES AN HOUR. THE ONE TO TWO HOUR OUTLOOK IS FOR ISOLATED STRONG STORMS AND SCATTERED SHOWERS TO CONTINUE OVER THE SOUTHERN THIRD OF IOWA. MILLER
Special weather statement, Jul 29, 11:51 PM CDT, 3 hours 33 minutes before
IAZALL-300510- SPECIAL WEATHER STATEMENT AND WEATHER UPDATE FOR IOWA NATIONAL WEATHER SERVICE DES MOINES IA 1150 PM CDT WED JUL 29 1992 ...SEVERE THUNDERSTORM WATCH IN EFFECT FOR PARTS OF SOUTHWEST AND SOUTH CENTRAL IOWA UNTIL 6 AM CDT THURSDAY MORNING... AT 1127 PM CDT...WIDELY SCATTERED STRONG AND INTENSE THUNDERSTORMS WERE OCCURRING OVER THE SOUTH TWO TIERS OF IOWAS COUNTIES. THE STRONGEST STORMS WERE LOCATED 60 MILES SOUTH OF DES MOINES NEAR LAMONI...AND 45 MILES SOUTHEAST OF COUNCIL BLUFFS OR 10 MILES EAST OF RED OAK. THESE STORMS WERE CAPABLE OF PRODUCING SMALL HAIL...STRONG WIND...DEADLY LIGHTNING...AND HEAVY DOWNPOURS. ALSO...THUNDERSHOWERS AND SHOWERS WERE SCATTERED OVER THE SOUTHERN QUARTER OF IOWA...SOUTH OF A COUNCIL BLUFFS TO DES MOINES TO CLINTON LINE. CLINTON IS 25 MILES NORTHEAST OF DAVENPORT. THE STORMS AND SHOWERS WERE MOVING SOUTHEAST AT 30 MILES AN HOUR. / MILLER
Special weather statement, Jul 29, 11:56 PM CDT, 3 hours 28 minutes before
IAZALL-300510- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY...CORRECTED FOR HEADING... NATIONAL WEATHER SERVICE DES MOINES IA 1150 PM CDT WED JUL 29 1992 ...SEVERE THUNDERSTORM WATCH IN EFFECT FOR PARTS OF SOUTHWEST AND SOUTH CENTRAL IOWA UNTIL 6 AM CDT THURSDAY MORNING... AT 1127 PM CDT...WIDELY SCATTERED STRONG AND INTENSE THUNDERSTORMS WERE OCCURRING OVER THE SOUTH TWO TIERS OF IOWAS COUNTIES. THE STRONGEST STORMS WERE LOCATED 60 MILES SOUTH OF DES MOINES NEAR LAMONI...AND 45 MILES SOUTHEAST OF COUNCIL BLUFFS OR 10 MILES EAST OF RED OAK. THESE STORMS WERE CAPABLE OF PRODUCING SMALL HAIL...STRONG WIND...DEADLY LIGHTNING...AND HEAVY DOWNPOURS. ALSO...THUNDERSHOWERS AND SHOWERS WER E SCATTERED OVER THE SOUTHERN QUARTER OF IOWA...SOUTH OF A COUNCIL BLUFFS TO DES MOINES TO CLINTON LINE. CLINTON IS 25 MILES NORTHEAST OF DAVENPORT. THE STORMS AND SHOWERS WERE MOVING SOUTHEAST AT 30 MILES AN HOUR. / MILLER
Special weather statement, Jul 30, 12:44 AM CDT, 2 hours 40 minutes before
IAZALL-300510- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 1245 AM CDT THU JUL 30 1992 ...SEVERE THUNDERSTORM WATCH IN EFFECT FOR PARTS OF SOUTHWEST AND SOUTH CENTRAL IOWA UNTIL 6 AM CDT THIS MORNING... ...A FLASH FLOOD WATCH FOR PARTS OF SOUTHWEST AND SOUTH CENTRAL IOWA UNTIL 6 AM CDT THIS MORNING... AT 1233 AM CDT...SHOWERS AND ISOLATED STRONG THUNDERSTORMS CONTINUED OVER ABOUT THE SOUTHERN THIRD OF IOWA. THE SHOWERS AND STORMS WERE SOUTH OF A LINE FROM OMAHA/COUNCIL BLUFFS NORTHEAST TO DES MOINES THEN SOUTHEAST TO 20 MILES NORTH OF BURLINGTON. THE STRONGEST STORM IN THIS AREA WAS LOCATED 50 MILES SOUTHWEST OF DES MOINES BETWEEN CUMBERLAND AND CRESTON. THIS STORMS WILL PRODUCE VERY HEAVY RAIN...FREQUENT DEADLY LIGHTNING AND POSSIBLY SOME SMALL HAIL. THE SHOWERS AND STORMS WERE MOVING EAST AT 25 TO 30 MILES AN HOUR. BARLOW
Special weather statement, Jul 30, 1:47 AM CDT, 1 hour 37 minutes before
IAZALL-300740- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 145 AM CDT THU JUL 30 1992 ...SEVERE THUNDERSTORM WATCH IN EFFECT FOR PARTS OF SOUTHWEST AND SOUTH CENTRAL IOWA UNTIL 6 AM CDT THIS MORNING... ...A FLASH FLOOD WATCH FOR PARTS OF SOUTHWEST AND SOUTH CENTRAL IOWA UNTIL 6 AM CDT THIS MORNING... AT 133 AM CDT...SHOWERS AND ISOLATED STRONG THUNDERSTORMS CONTINUED OVER ABOUT THE SOUTHERN HALF OF IOWA. THE SHOWERS AND STORMS WERE SOUTH OF A LINE FROM 30 MILES SOUTH OF SIOUX CITY...NEAR ONAWA...EAST THROUGH DES MOINES TO JUST SOUTH OF CEDAR RAPIDS. ALTHOUGH THE OVERALL INTENSITY OF THE THUNDERSTORMS HAS SHOWN A SLIGHT DECREASE SINCE 1230...SEVERAL OF THE STORMS PARTICULARLY THOSE ALONG A LINE FROM OMAHA/COUNCIL BLUFFS THROUGH DES MOINES WILL PRODUCE VERY HEAVY RAINS. THERE WILL BE SOME LOCALIZED STREET FLOODING IN AROUND THE DES MOINES METROPLOITAN AREA FOR THE NEXT SEVERAL HOURS. THE SHOWERS AND STORMS WERE MOVING EAST AT 25 TO 30 MILES AN HOUR. BARLOW
Special weather statement, Jul 30, 2:54 AM CDT, 30 minutes before
IAZALL-300840- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 247 AM CDT THU JUL 30 1992 ...A FLASH FLOOD WATCH FOR PARTS OF SOUTHWEST...CENTRAL AND EAST CENTRAL IOWA UNTIL 6 AM CDT THIS MORNING... AT 234 AM CDT...AN EXPANDING AREA OF NUMEROUS SHOWERS AND SCATTERED THUNDERSTORMS...SOME PRODUCING VERY HEAVY RAIN...CONTINUED OVER MOST OF THE SOUTHERN HALF OF IOWA. THE SHOWERS AND STORMS WERE LOCATED SOUTH OF A LINE FROM 25 MILES SOUTH OF SIOUX CITY SOUTHEAST TO JUST SOUTH OF CEDAR RAPIDS. THE HEAVIEST RAINS HAVE BEEN OCCURRING ALONG AND 20 MILES EITHER SIDE OF A LINE FROM 25 MILES NORTHEAST OF OMAHA/COUNCIL BLUFFS...NEAR AVOCA EAST THROUGH DES MOINES TO 15 MILES SOUTH OF CEDAR RAPIDS...NEAR KALONA. STREET FLOODING HAS BEEN REPORTED IN OSKALOOSA AND AROUND THE DES MOINES METROPOLITAN AREA. WATER WAS REPORTED OVER HIGHWAY 5...2 MILES EAST OF CARLISLE. ADDITIONAL FLOODING IS EXPECTED THROUGHOUT THIS AREA...AS NUMEROUS SHOWERS AND THUNDERSTORMS ARE EXPECTED TO CONTINUE THROUGH THIS AREA FOR ATLEAST THE NEXT 3 TO 4 HOURS. MOTORISTS ARE URGED TO WATCH FOR RISING WATER PARTICULARLY IN LOW LYING AREAS THROUGHOUT CENTRAL AND EAST CENTRAL IOWTA THIS MORNING. DO NOT ATTEMPT TO CROSS FLOODED ROADS...AS AN AUTOMOBILE COULD BE QUICKLY SWEPT AWAY. THE SHOWERS AND STORMS WERE MOVING EAST NORTHEAST AT 20 TO 25 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 30, 2:49 AM CDT | Flash Flood Warning | DMX | Warren | 116 min |
Nearby
Flash Flood Warnings in Iowa, 1992Every flash flood warning in 1992
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.