Alert archive / Iowa / Flash Flood Warnings in 1987
Flash Flood Warning 1, NWS Des Moines, IA
NWS Des Moines, IA issued this flash flood warning at Jul 7, 1987, 8:16 AM CDT for Clarke County, Decatur County, Iowa. It was in force for 3 hr.
The area
The counties it named.
The facts
- Issued
- Jul 7, 1987, 8:16 AM CDT (13:16 UTC)
- Expired
- Jul 7, 1987, 11:00 AM CDT
- In force
- 3 hr
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
Counties Clarke County, IA, Decatur 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, 1.3 hours before the alert went out and 222 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
- 3600 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 60 m²/s²
- 0-3 km storm-relative helicity
- 64 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 071318 FFWDSM IAC039-053-071600- <PQ< BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE DES MOINES IA 816 AM CDT TUE JUL 7 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL 1100 AM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF SOUTH CENTRAL IOWA... CLARKE AND NORTHWEST DECATUR A FLASH FLOOD WARNING MEANS FLOODING IS IMMINENT OR IS OCCURRING. TAKE NECESSARY PRECAUTIONS IMMEDIATELY. VERY HEAVY RAINS FELL OVER MOST OF CLARKE COUNTY AND NORTHWEST DECATUR COUNTY IN SOUTH CENTRAL IOWA EARLY THIS MORNING. AMOUNTS RANGED ANYWHERE FROM 4 TO 6 INCHES. WATER WAS REPORTED TO BE OVER ROADS IN MUCH OF CLARKE AND NORTH- WEST DECATUR COUNTY. SMALL CREEKS AND MANY FIELDS WERE FLOODED. MORE HEAVY RAINS CAN BE EXPECTED IN THESE AREAS DURING THE DAY AS PRECIPITATION NOW IN WESTERN IOWA WILL MOVE ACROSS THE SAME AREA. SIGNIFICANT RISES CAN ALSO BE EXPECTED ON THE THOMPSON RIVER NEAR DAVIS CITY. A MORE SPECIFIC FORECAST WILL BE AVAILABLE LATER THIS MORNING. PEOPLE IN FLOOD PRONE OR LOW LYING AREAS SHOULD MOVE TO HIGHER GROUND AT ONCE. ACT QUICKLY..AS FLOOD WATERS OFTEN RISE RAPIDLY. IF YOU ARE DRIVING..DO NOT TRY TO DRIVE THROUGH FLOOD WATERS OF UNKNOWN DEPTH. IF YOUR VEHICLE STALLS..ABANDON IT IMMEDIATELY AND SEEK HIGHER GROUND. DO NOT ATTEMPT TO CROSS A FLOWING STREAM ON FOOT WHERE THE WATER IS ABOVE YOUR KNEES. ADAMS/BAKER
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 7, 2:58 AM CDT, 5 hours 18 minutes before
<PQ< SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 257 AM CDT TUE JUL 7 1987 THE SEVERE THUNDERSTORM WARNING FOR CLAY AND BUENA VISTA COUNTIES OF NORTHWEST IOWA WILL EXPIRE AT 300 AM CDT. AT 250 AM CDT...RADAR INDICATED THAT THE STORMS OVER THESE RESPECTIVE COUNTIES HAVE WEAKENED. THEREFORE...THE WARNINGS WILL NOT BE RENEWED. MOVEMENT OF THE STORMS HAS CONTINUED EAST AROUND 25 MILES AN HOUR. BIKLE
Special weather statement, Jul 7, 5:46 AM CDT, 2 hours 30 minutes before
SPECIAL WEATHER STATEMENT <PQ< NATIONAL WEATHER SERVICE DES MOINES IA 540 AM CDT TUE JUL 7 1987 SEVERE THUNDERSTORM WATCH NUMBER 335 FOR A LARGE PART OF WESTERN AND CENTRAL IOWA HAS &BEEN CANCELLED. SHOWERS AND THUNDERSTORMS WILL CONTINUE FOR THE NEXT SEVERAL HOURS BUT THE THREAT OF SEVERE STORMS HAS ENDED. LOCALLY HEAVY RAINS WILL STILL BE POSSIBLE. CORBETT
Special weather statement, Jul 7, 5:52 AM CDT, 2 hours 24 minutes before
TTAASE KDSM 071052 RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 545 AM CDT TUE JUL 7 1987 AT 530 AM...AN AREA OF THUNDERSTORMS WITH VERY HEAVY RAINS WAS LOCATED IN CENTRAL AND LSOUTH LCENTRAL IOWA. THE HEAVIEST THUNDERSTORMS WERE LOCATED IN SOUTH CENTRAL IOWA JUST NORTH OF MOUNT AYR...ABOUT 40 MILES MILES SOUTHEAST OF DES MOINES. LLGHT RAIN WITH A FEW SCATTERED THUNDERSTORMS WERE ALSO FALLING ON MOST OF CENTRAL AND WEST CENTRAL IOWA...AS WELL AS A SMALL +PART OF NORTH CENTRAL IOWA. THESE STORMS WERE MOVING TO THE EAST AT 45 MILES AN HOUR. SCOTT
Local storm report, Jul 7, 6:53 AM CDT, 1 hour 23 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
654 AM CDT TUE JUL 7 1987
...ALL EVENTS OCCURRED DURING THE MORNING OF JULY 7TH...
150 UNCONFIRMED FUNNEL CLOUD REPORTED BETWEEN ROYAL AND
PETERSON IN SOUTHWEST CLAY COUNTY.
210 60 MILES AN HOUR WIND REPORTED AT MARATHON IN NORTHEAST
BUENA VISTA COUNTY.
210 UNCONFIRMED TORNADO REPORTED AT TERRILL IN SOUTHEAST
DICKINSON COUNTY.
245 62 MILES AN HOUR WIND REPORTED AT CARROLL IN CENTRAL
CARROLL COUNTY. RECEIVED REPORT OF THIS AT 545...THREE
HOURS LATER.
UNK UNCONFIRMED REPORT OF FUNNEL CLOUD NEAR THE JOHN DEERE PLANT
EAST OF SAYLORVILLE RESERVOIR. RECEIVED REPORT AT 4a43 AM CDT.
BIKLELocal storm report, Jul 7, 6:56 AM CDT, 1 hour 20 minutes before
LOCAL STORM REPORT...CORRECTION
NATIONAL WEATHER SERVICE DES MOINES IA
656 AM CDT TUE JUL 7 1987
...ALL EVENTS OCCURRED DURING THE MORNING OF JULY 7TH...
150 UNCONFIRMED FUNNEL CLOUD REPORTED BETWEEN ROYAL AND
PETERSON IN SOUTHWEST CLAY COUNTY.
210 60 MILES AN HOUR WIND REPORTED AT MARATHON IN NORTHEAST
BUENA VISTA COUNTY.
210 UNCONFIRMED TORNADO REPORTED AT TERRILL IN SOUTHEAST
DICKINSON COUNTY.
245 62 MILES AN HOUR WIND REPORTED AT CARROLL IN CENTRAL
CARROLL COUNTY. RECEIVED REPORT OF THIS AT 545...THREE
HOURS LATER.
UNK UNCONFIRMED REPORT OF FUNNEL CLOUD NEAR THE JOHN DEERE PLANT
EAST OF SAYLORVILLE RESERVOIR IN POLkK COUNTY. RECEIVED REPORT
AT 443 AM CDT.
BIKLEThe office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 6, 7:27 PM CDT | Severe Thunderstorm Warning | DMX | Mahaska | 33 min |
| Jul 7, 2:06 AM CDT | Severe Thunderstorm Warning | DMX | Buena Vista, Clay | 84 min |
Nearby
Flash Flood Warnings in Iowa, 1987Every flash flood warning in 1987
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.