Alert archive / Iowa / Flash Flood Warnings in 1990
Flash Flood Warning 28, NWS Des Moines, IA
NWS Des Moines, IA issued this flash flood warning at Jul 27, 1990, 12:38 PM CDT for Cerro Gordo County, Franklin County, Iowa. It was in force for 3 hr.
The area
The counties it named.
The facts
- Issued
- Jul 27, 1990, 12:38 PM CDT (17:38 UTC)
- Expired
- Jul 27, 1990, 3:45 PM CDT
- In force
- 3 hr
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
Counties Cerro Gordo County, IA, Franklin County, IA
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
The nearest sounding before it
Minneapolis, MN (KSTC), launched 12:00Z, 5.6 hours before the alert went out and 218 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
- 86 J/kg
- Mixed-layer CIN
- -21 J/kg
- Mixed-layer LCL
- 580 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 87 m²/s²
- 0-3 km storm-relative helicity
- 122 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KALO 271741 COR
FFWALO
IAC069-033-272045-
BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE WATERLOO IA...CORREECTION FOR HIWAY NUMBER
1238 PM CDT FRI JUL 27 1990
THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING
EFFECTIVE UNTIL 345 PM CDT FOR PEOPLE IN THE FOLLOWING
COUNTIES
IN THE NORTH CENTRAL PART OF IOWA
NORTHERN FRANKLIN...SOUTHERN CERRO GORDO
AT TIME 1230 PM CDT HIWAY 65 WAS CLOSED NORTH OF HAMPTON AND ALSO
NORTH OF ROCKWELL...THIS IS 20 TO 30 MILES SOUTH OF MASON CITY
IOWA. OVER TWO INCHES OF RAIN WAS REPORTED IN MASON CITY BETWEEN
7AM AND 10 AM THIS MORNING WHICH HAS CAUSED THE EAST BRANCH OF
BEAVER DAM CREEK AND OTTER CREEK TO LEAVE THEIR BANKS.
DO NOT ATTEMPT TO DRIVE THROUGH RISING FLOOD WATERS. MOST
FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES.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 27, 7:43 AM CDT, 4 hours 55 minutes before
IAZALL-271400- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 745 AM CDT FRI JUL 27 1990 ...FLASH FLOOD WATCH FOR SOUTHWEST AND CENTRAL IOWA THIS AFTERNOON AND TONIGHT.... AT 730 AM...SCATTERED THUNDERSTORMS AND SHOWERS...SOME WITH VERY HEAVY RAIN...CONTINUED OVER THE EAST HALF OF THE STATE. ALSO...ISOLATED THUNDERSTORMS AND SHOWERS HAD DEVELOPED OVER THE WEST CENTRAL AND NORTHWEST COUNTIES. THE STRONGEST STORMS WERE LOCATED 10 TO 20 MILES WEST AND SOUTHWEST OF MASON CITY...AND NEAR ROCKWELL CITY...HUMBOLDT... AND DENISON...OR FROM 60 MILES SOUTHWEST OF MASON CITY TO 50 MILES SOUTHEAST OF SIOUX CITY. THE THUNDERSTORMS AND SHOWERS WERE MOVING NOR<THEAST AT 20 MILES AN HOUR. DM
Special weather statement, Jul 27, 8:33 AM CDT, 4 hours 5 minutes before
IAZALL-271430- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 833 AM CDT FRI JUL 27 1990 ...FLASH FLOOD WATCH FOR SOUTHWEST AND CENTRAL IOWA THIS AFTERNOON AND TONIGHT.... AT 825 AM...NUMEROUS SHOWERS AND ISOLATED THUNDERSTORMS CONTINUED OVER ABOUT THE NORTH TWO THIRDS OF IOWA. THE SHOWERS AND STORMS WERE MOSTLY NORTH OF A LINE EXTENDING FROM 30 MILES NORTH OF BURLINGTON...TO NEAR OTTUMWA...TO DES MOINES... TO ABOUT 40 MILES SOUTH OF SIOUX CITY. THE SHOWERS AND STORMS WERE MOVING NORTHEAST AT 15 MILES AN HOUR. WPM
Special weather statement, Jul 27, 9:42 AM CDT, 2 hours 56 minutes before
IAZALL-271542- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 942 AM CDT FRI JUL 27 1990 ...FLASH FLOOD WATCH REMAINS IN EFFECT FOR SOUTHWEST AND CENTRAL IOWA THIS AFTERNOON AND TONIGHT...AND NORTHWEST IOWA TODAY AND TONIGHT... AT 930 AM CDT...NUMEROUS SHOWERS AND ISOLATED THUNDERSTORMS CONTINUED OVER NORTHEAST AND NORTH CENTRAL IOWA...WHILE SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS CONTINUED OVER THE NORTHWEST. THE SHOWERS AND STORMS WERE MOSTLY NORTH OF A LINE EXTENDING FROM NEAR DAVENPORT/MOLINE...TO 25 MILES NORTH OF DES MOINES...TO 40 MILES SOUTHEAST OF SIOUX CITY. THE SHOWERS AND STORMS WERE MOVING NORTHEAST AT 20 MILES AN HOUR. WPM
Special weather statement, Jul 27, 10:38 AM CDT, 2 hours before
IAZALL-271640- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 1035 AM CDT FRI JUL 27 1990 ...FLOOD/FLASH FLOOD WATCH SOUTHWEST...CENTRAL...AND NORTHEAST IOWA THIS AFTERNOON AND TONIGHT... AT 1025 AM CDT...WIDELY SCATTERED SHOWERS AND THUNDERSTORMS CONTINUED OVER NORTH CENTRAL AND NORTHEAST IOWA. THE HEAVIEST RAINFALL WAS LOCATED IN ABOUT A 10 MILE WIDE BAND... FROM NEAR ROCKWELL CITY...TO JEWELL...TO ELDORA...OR FROM 80 MILE SOUTHWEST...TO 80 MILES SOUTH OF MASON CITY. THE SHOWERS AND STORMS WERE MOSTLY NORTH OF A LINE EXTENDING FROM NEAR DAVENPORT/MOLINE...TO CEDAR RAPIDS...TO 80 MILES NORTHWEST OF DES MOINES. THE SHOWERS AND STORMS WERE MOV=ING NORTHEAST AT 15 MILES AN HOUR. WPM
Special weather statement, Jul 27, 11:30 AM CDT, 1 hour 8 minutes before
IAZALL-271730- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 1130 AM CDT FRI JUL 27 1990 ...FLOOD/FLASH FLOOD WATCH SOUTHWEST...CENTRAL...AND NORTHEAST IOWA THIS AFTERNOON AND TONIGHT... AT 1125 AM CDT...NUMEROUS SHOWERS AND ISOLATED THUNDERSTORMS CONTINUED OVER NORTH CENTRAL AND NORTHEAST IOWA. THE AREA OF SHOWERS AND THUNDERSTORMS WAS 50 MILES WIDE...CENTERED FROM NEAR FORT DODGE...TO 30 MILES EAST OF WATERLOO. THE HEAVIEST RAINFALL WAS IN ABOUT A 10 MILE WIDE AREA...ACROSS SOUTHERN WEBSTER...SOUTHERN HAMILTON...AND SOUTHERN HARDIN COUNTIES... OR FROM JUST SOUTHEAST OF FORT DODGE...TO NEAR JEWELL TO JUST SOUTHWEST OF ELDORA. THE SHOWERS AND THUNDERSTORMS WERE MOVING VERY SLOWLY NORTHEAST AT AROUND 5 MILES AN HOUR. WPM
Special weather statement, Jul 27, 12:35 PM CDT, 3 minutes before
IAZALL-271830- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 1235 PM CDT FRI JUL 27 1990 ...FLOOD/FLASH FLOOD WATCH SOUTHWEST...CENTRAL...AND NORTHEAST IOWA THIS AFTERNOON AND TONIGHT... AT 1228 PM CDT...NUMEROUS RAIN SHOWERS CONTINUED OVER NORTH CENTRAL INTO NORTHEAST IOWA. THE AREA OF SHOWERS WAS 40 MILES WIDE...CENTERED FROM NEAR WEBSTER CITY...TO 25 MILES EAST OF WATERLOO. WEBSTER CITY IS 65 MILES NORTH OF DES MOINES. THERE WAS A DECREASE IN BOTH OVERALL INTENSITY AND OVERALL COVERAGE OF THE SHOWERS OVER THIS AREA SINCE 1130 THIS MORNING. THE SHOWERS WERE MOVING NORTHEAST AT 15 MILES AN HOUR. . WPM
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 27, 11:45 AM CDT | Flash Flood Warning | DMX | Hamilton, Hardin | 4 hr |
Nearby
Flash Flood Warnings in Iowa, 1990Every flash flood warning in 1990
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.