Alert archive / Iowa / Flash Flood Warnings in 1990
Flash Flood Warning 18, NWS Des Moines, IA
NWS Des Moines, IA issued this flash flood warning at Jun 19, 1990, 9:19 PM CDT for 4 counties in Iowa. It was in force for 5 hr.
The area
The counties it named.
The facts
- Issued
- Jun 19, 1990, 9:19 PM CDT (02:19 UTC)
- Expired
- Jun 20, 1990, 2:00 AM CDT
- In force
- 5 hr
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
Counties Clarke County, IA, Decatur County, IA, Lucas County, IA, Wayne 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 00:00Z, 2.3 hours before the alert went out and 241 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
- 3628 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- -66 m²/s²
- 0-3 km storm-relative helicity
- 74 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 200222
FFWDSM
IAC039-053-117-159-175-185-200700-
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
919 PM CDT TUE JUN 19 1990
THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL 200 AM CDT
FOR PEOPLE IN THE FOLLOWING COUNTIES...
IN SOUTH CENTRAL IOWA
...CLARKE...DECATUR...LUCAS...RINGGOLD...UNION...WAYNE
AT 910 PM...WEATHER RADAR INDICATED A SECOND EAST-WEST LINE OF
THUNDERSTORMS DEVELOPING...THIS TIME OVER SOUTH CENTRAL IOWA. THIS
LINE OF STORMS STRETCHED FROM THE RINGGOLD-UNION COUNTY LINE...50
MILES SOUTHWEST OF DES MOINES...TO THE WAYNE-LUCAS COUNTY LINE...40
MILES SOUTHEAST OF DES MOINES.
THE STORMS IN THIS LINE ARE MOVING EAST...SO SEVERAL INTENSE
THUNDERSTORMS WILL PASS OVER THE SAME AREA. SINCE EACH STORM IS
PRODUCING EXTREMELY HEAVY RAINS...FLASH FLOODING IS A VERY REAL
THREAT.
THIS WARNING INCLUDES THE CITIES OF
DIAGONAL...AFTON...OSCEOLA...LUCAS...CHARITON...LEON...HUMMESTON...
ALLERTON...CORYDON...AND MOUNT AYR.
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 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.
TRUETTWhat 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, Jun 19, 6:48 PM CDT, 2 hours 31 minutes before
IAZALL-200030- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY...COR FIRST PARA... NATIONAL WEATHER SERVICE DES MOINES IOWA 640 PM CDT TUE JUN 19 1990 ...A TORNADO WATCH IS IN EFFECT FOR THE WEST HALF OF IOWA UNTIL 10 PM CDT THIS TUESDAY EVENING... ...A FLASH FLOOD/FLOOD WATCH FOR EAST AND SOUTH IOWA TONIGHT... AT 631 PM CDT...AN INTENSE STORM WAS LOCATED JUST NORTHWEST OF WINTERSET...OR ABOUT 25 MILES SOUTHWEST OF DES MOINES. THIS STORM WAS PRODUCING EXTREMELY HEAVY RAINFALL...FREQUENT DANGEROUS LIGHTNING...AND COULD ALSO PRODUCE STRONG GUSTY WIND. SHOULD THREATENING WEATHER APPROACH...PEOPLE IN THIS AREA SHOULD BE PREPARED TO SEEK SHELTER IMMEDIATELY. OVER THE REMAINDER OF CENTRAL IOWA AND SOUTHEAST IOWA...SCATTERED THUNDERSTORMS CONTINUED TO DEVELOP...IN A 35 MILE WIDE AREA... CENTERED FROM 25 MILES NORTH OF OTTUMWA...TO 40 MILES WEST OF DES MOINES. THE STORMS WERE ALL MOVING EAST AT 25 TO 30 MILES AN HOUR. WPM/CAB
Special weather statement, Jun 19, 7:19 PM CDT, 2 hours before
IAZALL-200100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IOWA 720 PM CDT TUE JUN 19 1990 ...A TORNADO WATCH IS IN EFFECT FOR THE WEST HALF OF IOWA UNTIL 10 PM CDT THIS TUESDAY EVENING... ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL MIDNIGHT FOR ABOUT THE NORTHEAST ONE QUARTER OF IOWA... ...A FLASH FLOOD/FLOOD WATCH FOR EAST AND SOUTH IOWA TONIGHT... AT 700 PM CDT...SCATTERED INTENSE THUNDERSTORMS CONTINUED IN A 15 MILE WIDE AREA...FROM 25 MILES WEST SOUTHWEST OF DES MOINES TO 15 MILES NORTH OF OTTUMWA. THE MOST INTENSE STORMS WERE LOCATED FROM JUST NORTH OF WINTERSET TO JUST NORTH OF INDIANOLA ...AND JUST NORTHEAST OF OSKALOOSA. ANOTHER INTENSE STORM WAS LOCATED ABOUT 10 MILES NORTHEAST OF DES MOINES. . SHOULD THREATENING WEATHER APPROACH...PEOPLE IN THE PATH OF THESE STORMS SHOULD SEEK SHELTER IMMEDIATELY. THESE STORMS WERE PRODUCING EXCESSIVE RAINFALL...FREQUENT DANGEROUS LIGHTNING...AND COULD PR:ODUCE BRIEF STRONG GUSTY WIND. ALL THE STORMS WERE MOVING EAST AT 25 MILES AN HOUR. WPM
Special weather statement, Jun 19, 7:40 PM CDT, 1 hour 39 minutes before
IAZALL-200130- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IOWA 740 PM CDT TUE JUN 19 1990 ...A TORNADO WATCH IS IN EFFECT FOR THE WEST HALF OF IOWA UNTIL 10 PM CDT THIS TUESDAY EVENING... ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL MIDNIGHT FOR ABOUT THE NORTHEAST ONE QUARTER OF IOWA... ...A FLASH FLOOD/FLOOD WATCH FOR EAST AND SOUTH IOWA TONIGHT... AT 730 PM CDT...SCATTERED INTENSE THUNDERSTORMS CONTINUED IN A 25 MILE WIDE AREA...FROM 15 MILES WEST SOUTHWEST OF DES MOINES TO 15 MILES NORTHEAST OF OTTUMWA. THE MOST INTENSE STORMS WERE LOCATED FROM JUST NORTHWEST OF WINTERSET TO JUST NORTH OF INDIANOLA ...AND JUST NORTH OF OTTUMWA. SEVERAL INTENSE STORMS WERE LOCATED ABOUT 10 MILES NORTHEAST OF DES MOINES...BETWEEN DES MOINES AND NEWTON. . SHOULD THREATENING WEATHER APPROACH...PEOPLE IN THE PATH OF THESE STORMS SHOULD SEEK SHELTER IMMEDIATELY. THESE STORMS WERE PRODUCING EXCESSIVE RWAINFALL...FREQUENT DANGEROUS LIGHTNING...AND COULD PRODUCE BRIEF STRONG GUSTY WIND. ALL THE STORMS WERE MOVING EAST AT 25 MILES AN HOUR. GGF
Special weather statement, Jun 19, 8:12 PM CDT, 1 hour 7 minutes before
IAZ002-003-007-200200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 810 PM CDT TUE JUN 19 1990 ...SEVERE THUNDERSTORM WATCH UNTIL MIDNIGHT CDT... ...FLASH FLOOD WATCH ALL OF TONIGHT... AT 805 PM CDT SHOWERS WERE OCCURRING OVER NORTHCENTRAL AND NORTHEAST IOWA GENERALLY NORTH OF HIGHWAY 18. STRONG THUNDERSTORMS WERE LOCATED IN SOUTHERN AND SOUTHEAST MINNESOTA. ALL PRECIPITATION WAS MOVING EAST AND SOUTHEAST AT 20 MILES AN HOUR. THE STRONG THUNDERSTORMS IN MINNESOTA SHOULD BE REACHING THE IOWA BORDER BY 830 OR 900 PM CDT AND CONTINUE MOVING EAST AND SOUTHEAST AROUND 20 MILES AN HOUR. JOHNSON
Special weather statement, Jun 19, 8:13 PM CDT, 1 hour 6 minutes before
IAZALL-200200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IOWA 810 PM CDT TUE JUN 19 1990 ...A TORNADO WATCH IS IN EFFECT FOR THE WEST HALF OF IOWA UNTIL 10 PM CDT THIS TUESDAY EVENING... ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL MIDNIGHT FOR ABOUT THE NORTHEAST ONE QUARTER OF IOWA... ...A FLASH FLOOD/FLOOD WATCH FOR EAST AND SOUTH IOWA TONIGHT... AT 800 PM CDT...A NARROW BAND OF INTENSE THUNDERSTORMS WAS INDICATED OVER SOUTH CENTRAL IOWA. THE THUNDERSTORMS EXTENDED FROM 7 MILES SOUTH OF DES MOINES TO OSKALOOSA...20 MILES NORTHWEST OF OTTUMWA. THE LARGEST STORM WAS NORTH OF KNOXVILLE OVER RED ROCK LAKE. THE STORMS IN THIS BAND WILL PRODUCE EXTREMELY HEAVY RAINS. LOW LYING AREAS IN THE VICINITY OF THE STORMS WILL FLOOD QUICKLY. DO NOT DRIVE ACROSS FLOODED HIGHWAYS...ONLY A FEW INCHES OF FAST RUNNING WATER WILL SWEEP AWAY A VEHICLE. ALSO THESE STORMS MAY PRODUCE HIGH WINDS AND HAIL. THE STORMS WERE MOVING EAST AT 25 MILES AN HOUR. DLF
Special weather statement, Jun 19, 8:53 PM CDT, 26 minutes before
IAZALL-200245- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IOWA 850 PM CDT TUE JUN 19 1990 ...A TORNADO WATCH IS IN EFFECT FOR THE WEST HALF OF IOWA UNTIL 10 PM CDT THIS TUESDAY EVENING... ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL MIDNIGHT FOR ABOUT THE NORTHEAST ONE QUARTER OF IOWA... ...A FLASH FLOOD/FLOOD WATCH FOR EAST AND SOUTH IOWA TONIGHT... AT 830 PM CDT...AN INTENSE THUNDERSTORM WAS INDICATED OVER SOUTH CENTRAL IOWA...OVER AND JUST TO THE NORTH OF PELLA. HIGH WINDS...HAIL AND TORRENTIAL RAINS ARE LIKELY FROM THIS STORM. THE STORM WAS MOVING EAST AT 25 MILES AN HOUR AND WILL BE LOCATED IN SOUTHEAST IOWA NEAR WHAT CHEER BY 930 PM. THIS STORM WAS PART OF A NARROW BAND OF STRONG THUNDERSTORMS THAT WAS LOCATED FROM 7 MILES SOUTH OF DES MOINES EAST TO SIGOURNEY... 20 MILES NORTHEAST OF OTTUMWA. THESE STORMS WERE ALSO MOVING EAST AT 25 MILES AN HOUR. THEY WERE ALSO PRODUCING EXTREMELY HEAVY RAINS. OTHER STRONG STORMS WERE OVER EXTREME NORTH CENTRAL AND NORTHEAST IOWA FROM THE MINNESOTA BORDER NORTH OF MASON CITY TO NEAR DECORAH. DLF
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 19, 7:04 PM CDT | Flash Flood Warning | DMX | Marion, Warren | 5 hr |
| Jun 19, 7:04 PM CDT | Flash Flood Warning | DMX | Madison | 5 hr |
| Jun 19, 8:05 PM CDT | Flash Flood Warning | DMX | Keokuk, Mahaska | 4 hr |
| Jun 19, 8:05 PM CDT | Flash Flood Warning | DMX | Washington | 4 hr |
| Jun 19, 8:11 PM CDT | Severe Thunderstorm Warning | DMX | Jones | 49 min |
| Jun 19, 8:11 PM CDT | Severe Thunderstorm Warning | DMX | Mahaska | 49 min |
| Jun 19, 8:38 PM CDT | Flash Flood Warning | DMX | Appanoose, Davis, Monroe, Wapello | 7 hr |
| Jun 19, 8:38 PM CDT | Flash Flood Warning | DMX | Jefferson, Van Buren | 7 hr |
| Jun 19, 8:45 PM CDT | Tornado Warning | DMX | Marion | 30 min |
| Jun 19, 8:48 PM CDT | Severe Thunderstorm Warning | DMX | Winneshiek | 42 min |
| Jun 19, 9:00 PM CDT | Severe Thunderstorm Warning | DMX | Clarke, Union | 45 min |
| Jun 19, 9:12 PM CDT | Severe Thunderstorm Warning | DMX | Decatur, Ringgold | 48 min |
| Jun 19, 9:13 PM CDT | Severe Thunderstorm Warning | DMX | Keokuk, Mahaska | 62 min |
| Jun 19, 9:15 PM CDT | Severe Thunderstorm Warning | DMX | Allamakee | 30 min |
| Jun 19, 9:19 PM CDT | Flash Flood Warning | DMX | Ringgold, Union | 5 hr |
| Jun 19, 9:42 PM CDT | Tornado Warning | DMX | Decatur, Ringgold | 48 min |
| Jun 19, 10:14 PM CDT | Severe Thunderstorm Warning | DMX | Warren | 46 min |
| Jun 19, 10:23 PM CDT | Tornado Warning | DMX | Decatur | 37 min |
| Jun 19, 10:52 PM CDT | Severe Thunderstorm Warning | DMX | Wayne | 33 min |
| Jun 19, 11:31 PM CDT | Severe Thunderstorm Warning | DMX | Appanoose | 29 min |
| Jun 19, 11:55 PM CDT | Flash Flood Warning | DMX | Keokuk, Washington | 6 hr |
| Jun 19, 11:55 PM CDT | Flash Flood Warning | DMX | Mahaska | 6 hr |
| Jun 19, 11:55 PM CDT | Flash Flood Warning | DMX | Marion | 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.