Alert archive / Iowa / Flash Flood Warnings in 1990
Flash Flood Warning 27, NWS Des Moines, IA
NWS Des Moines, IA issued this flash flood warning at Jul 27, 1990, 11:45 AM CDT for Hamilton County, Hardin County, Iowa. It was in force for 4 hr.
The area
The counties it named.
The facts
- Issued
- Jul 27, 1990, 11:45 AM CDT (16:45 UTC)
- Expired
- Jul 27, 1990, 4:00 PM CDT
- In force
- 4 hr
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
Counties Hamilton County, IA, Hardin 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
Omaha, NE (KOAX), launched 12:00Z, 4.8 hours before the alert went out and 267 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 3635 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- 4 m²/s²
- 0-3 km storm-relative helicity
- 11 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KDSM 271646 FFWDSM IAC079-083-272100- FLOOD WARNING NATIONAL WEATHER SERVICE DES MOINES IA 1145 AM CDT FRI JUL 27 1990 ...FLOOD WARNING FOR HAMILTON AND HARDIN COUNTIES UNTIL 4 PM... SINCE 930 AM...A LINE OF THUNDERSTORMS HAS BEEN ANCHORED OVER HAMILTON AND HARDIN COUNTIES. THE LINE EXTENDED FROM A FEW MILES SOUTHEAST OF FORT DODGE...JUST SOUTH OF WEBSTER CITY...TO NEAR ELDORA. THIS AREA IS SOME 50 TO 70 MILES NORTH OF DES MOINES. THESE STORMS HAVE BEEN WEAKENING SLOWLY SINCE ABOUT 10 AM...BUT THEIR NEARLY STATIONARY MOVEMENT HAS BEEN CAUSING LOCALLIZED HEAVY RAINS. THESE RAINS WILL CAUSE WIDESPREAD FLOODING OF CREEKS AND STREAMS IN THE WARNING AREA. PEOPLE LIVING IN FLOOD PRONE AREAS SHOULD MOVE TO HIGHER GROUND. NEVER TRY TO CROSS FLOOD WATERS OVER KNEE DEEP...OR DRIVE THROUGH FLOOD WATERS OF UNKNOWN DEPTH. AT 1130 AM...THE HAMILTON COUNTY SHERIFFS DEPARTMENT REPORTED THAT... AS A PRECAUTIONARY MEASURE...EVACUATIONS WERE BEGINNING AT A BIBLE CAMP NEAR RANDALL...IN THE EXTREME SOUTHERN PART OF THE COUNTY. TRUETT
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, 6:43 AM CDT, 5 hours 2 minutes before
IAZALL-271300- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 645 AM CDT FRI JUL 27 1990 ...FLASH FLOOD WATCH FOR SOUTHWEST AND CENTRAL IOWA THIS AFTERNOON AND TONIGHT.... AT 630 AM...SCATTERED THUNDERSTORMS...SOME WITH VERY HEAVY RAIN... CONTINUED OVER MUCH OF THE EAST ONE HALF OF THE STATE. THE STRONGEST THUNDERSTORMS WERE LOCATED 10 TO 30 MILES SOUTHWEST OF MASON CITY AND 65 MILES NORTHEAST OF DES MOINES...NEAR ACKLEY. THE AREA OF STORMS AND SHOWERS WAS EAST OF ALINE FROM THE ALGONA AREA ...50 MILES WEST OF MASON CITY...TO THE AFTON AREA...40 MILES SOUTHWEST OF DES MOINES. THE STORMS AND SHOWERS WERE MOVING NORTHEAST AT 20 MILES AN HOUR. DM
Special weather statement, Jul 27, 7:43 AM CDT, 4 hours 2 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, 3 hours 12 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 3 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, 1 hour 7 minutes 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, 15 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
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 27, 12:38 PM CDT | Flash Flood Warning | DMX | Cerro Gordo, Franklin | 3 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.