Alert archive / Oklahoma / Flash Flood Warnings in 1987
Flash Flood Warning 13, NWS Norman, OK
NWS Norman, OK issued this flash flood warning at May 27, 1987, 9:25 PM CDT for Comanche County, Grady County, Stephens County, Oklahoma. It was in force for 3 hr.
The area
The counties it named.
The facts
- Issued
- May 27, 1987, 9:25 PM CDT (02:25 UTC)
- Expired
- May 28, 1987, 12:30 AM CDT
- In force
- 3 hr
- Issued by
- NWS Norman, OK
- Area
- Whole counties
Counties Comanche County, OK, Grady County, OK, Stephens County, OK
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
Ok Cty/Will Rgrs, OK (KOKC), launched 00:00Z, 2.4 hours before the alert went out and 87 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
- 7 J/kg
- Mixed-layer CIN
- -99 J/kg
- Mixed-layer LCL
- 574 m above ground
- 0-6 km bulk shear
- 60 kt
- 0-1 km storm-relative helicity
- 274 m²/s²
- 0-3 km storm-relative helicity
- 582 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KOKC 280225
FFWOKC
OKC017-027-051-083-087-109-015-031-137-280530-
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
925 PM CDT WED MAY 27 1987
THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING
EFFECTIVE UNTIL 1230 AM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES...
IN CENTRAL OKLAHOMA
...CANADIAN...CLEVELAND...GRADY
...SOUTHERN LOGAN...MCCLAIN...OKLAHOMA
IN SOUTHWEST OKLAHOMA
...CADDO...COMANCHE...STEPHENS
WIDESPREAD FLOODING CONTINUES TO BE REPORTED IN THESE COUNTIES. THE
HEAVIEST THUNDERSTORMS HAVE MOVED OUT OF THE AREA BUT THE THREAT OF
FLASH FLOODING WILL REMAIN HIGH FOR THE NEXT FEW HOURS AS RUNOFF FROM
RAINFALL AMOUNTS IN EXCESS OF 7 INCHES CONTINUES TO SURGE INTO
STREAMS AND ACROSS ROADS.
EVEN IF THE WATERS BEGIN TO RESIDE PERSONS SHOULD BE ALERT FOR CREEKS
AND STREAMS TO FLOOD AGAIN AS ANOTHER SERIES OF STORMS MAY FORM OR
MOVE INTO THE STATE FROM TEXAS BEFORE SUNRISE.
A FLASH FLOOD WATCH REMAINS IN EFFECT FOR MUCH OF THE STATE.
A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS
IMMINENT. MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. DO NOT
ATTEMPT TO CROSS BRIDGES...DIPS...OR LOW SPOTS IF WATER COVERS
THE ROADWAY. NEVER TRY TO CROSS A FLOWING STREAM...EVEN A SMALL
ONE...ON FOOT. TO ESCAPE RISING WATER MOVE UP TO HIGHER GROUND.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, May 27, 6:50 PM CDT, 2 hours 35 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE OKLAHOMA CITY OK 645 PM CDT WED MAY 27 1987 ...A FLASH FLOOD WATCH IS IN EFFECT FOR MOST OF NORTHWESTERN...CENTRAL AND NORTHERN OKLAHOMA FOR TONIGHT AND THURSDAY... AT 635 PM...THE OKLAHOMA CITY RADAR INDICATED A LARGE AREA OF RAIN AND THUNERSTORMS EAST OF A LINE FROM ELMER IN JACKSON COUNTY TO BUTLER IN CUSTER COUNTY TO MANCHESTER IN GRANT COUNTY. HEAVY RAIN COVERED A LARGE AREA FROM OKLAHOMA CITY TO THE FORT SILL AREA. OTHER THUNDERSTORMS WITH HEAVY RAIN WERE LOCATED SOUTH OF TULSA. IF FLASH FLOODING IS OBSERVED ...ACT QUICKLY. MOVE UP TO ESCAPE FLOOD WATERS. DO NOT STAYT IN AREAS SFUBJECT TO FLOODING WHEN WATER BEGINS RISING. THE AREA OF THUNDERSTORMS WAS DRIFTING TO THE EAST AT 10 MILES AN HOUR WHILE THE INDIVIDUAL THUNDERSTORMS WERE MOVING NORTHEAST AT 30 MILES AN HOUR.
Special weather statement, May 27, 7:50 PM CDT, 1 hour 35 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE OKLAHOMA CITY OK 745 PM CDT WED MAY 27 1987 ...A FLASH FLOOD WATCH IS IN EFFECT FOR MOST OF NORTHWESTERN...CENTRAL AND NORTHERN OKLAHOMA FOR TONIGHT AND THURSDAY... AT 735 PM...THE OKLAHOMA CITY RADAR INDICATED A LARGE AREA OF RAIN AND THUNERSTORMS OVER NORTHEAST...NORTHCENTRAL...CENTRAL AND SOUTHCENTRAL OKLAHOMA. THE HEAVIEST RAIN AND STRONG THUNDERSTORMS WERE MAINLY WITHIN A 50 MILES RADIOUS OF OKLAHOMA CITY. COMPUTER READOUT DATA INDICATED 2 INCHES OF RAIN WAS OCCURRING PER HOUR. HOWEVER...3 TO 5 INCHES OF RAIN HAS OCCURRED IN THE OKLAHOMA CITY AREA DURING THE PAST 5 HOURS. THE AREA OF THUNDERSTORMS WAS DRIFTING TO THE EAST AT 10 MILES AN HOUR WHILE THE INDIVIDUAL THUNDERSTORMS WERE MOVING NORTHEAST AT 30 MILES AN HOUR. PERSONS IN LOW LYING AREA SHOULD TAKE EXT"REME CAUSION OF POSSIBLE FLOODING. IF FLOODING IS OCCURING IN YOUR AREA...DO NOT ATTEMPT TO CROSS SAID AREAS. MOVE TO UPPER LEVELS IN ALL AREAS OF POSSIBLE FLOODING. MOTORIST SHOULD BE ON ALERT FOR FAST MOVING STREAMS OVER ROADWAYS.
Special weather statement, May 27, 7:56 PM CDT, 1 hour 29 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WICHITA FALLS TX 755 PM CDT WED MAY 27 1987 ...A TORNADO WATCH IS IN EFFECT UNTIL 10PM CDT FOR THE FOLLOWING NORTH CENTRAL TEXAS COUNTIES..WICHITA..WILBARGER..HARDEMAN..FOARD..KNOX AND BAYLOR. A TORNADO WATCH IS IN EFFECT UNTIL 12 MIDNIGHT FOR THE FOLLOWING NORTH CENTRAL TEXAS COUNTIES..CLAY..MONTAGUE..ARCHER AND YOUNG. JUST BEFORE 8PM CDT..THE STRONGEST THUNDERSTORM COMPLEX WAS OBSERVED IN WILBAEGER COUNTY FROM THE VERNON AREA TO WEST OF LAKE KEMP. ELSEWHERE.. THUNDERSTORMS PRODUCING LOCALLY VERY HEAVY RAIN AND FREQUENT LIGHTNING WERE IN PROGRESS OVER PORTIONS OF WICHITA..ARCHER..CLAY AND BAYLOR COUNTIES. SMALL STREAMS WERE REPORTED NEAR BANKFULL IN THE VERNON AREA WITH VERY HEAVY RAIN IN PROGRESS. HERE IN THE WICHITA FALLS AREA..ANOTHER IN A SERIES OF THUNDERSOTRMS PRODUCING TORRENTUAL RAINS WAS RAKING THE AREA. THUNDERSTORMS WERE MOVING NORTHEAST AT 30 MPH. AFTER THIS BAND OF ACTIVITY CLEARS THE AREA..A BREAK OF SEVERAL HOURS MAY OCCUR..HOWEVER..RUNOFF MAY BRIEFLY FLOOD LOW LYING AREAS..AREA MOTORIST SHOULD USE EXTREME CAUTION.
Special weather statement, May 27, 8:05 PM CDT, 1 hour 20 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WICHITA FALLS TX 805 PM CDT WED MAY 27 1987 ...EXTREMELY HEAVY RAIN IS NOW BEING OBSERVED AT THE NATIONAL WEATHER SERVICE OFFICE AT WICHITA FALLS. DURING THE PAST 20 MINUTES .60 INCHES OF RAIN HAVE BEEN RECORDED AND ITS STILL RAINING VERY HARD. RAMIREZ
Special weather statement, May 27, 8:54 PM CDT, 31 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE OKLAHOMA CITY OK 845 PM CDT WED MAY 27 1987 ...A TORNADO WATCH IS IN EFFECT FOR PORTIONS OF CENTRAL AND EASTERN OKLAHOMA UNTIL KMIDNIGHT CDT THIS WEDNESDAY EVENING... ...A FLASH FLOOD WATCH IS IN EFFECT FOR MOST OF NORTHWESTERN...CENTRAL AND NORTHERN OKLAHOMA FOR TONIGHT AND THURSDAY... AT 835 PM...THE OKLAHOMA CITY RADAR INDICATED A LINE OF STRONG THUNDERSTORMS WITH HEAVY RAIN FROM NEAR DEPEW IN WESTERN CREEK COUNTY TO TECUMSEH IN CENTRAL POTTAWATOMIE COUNTY. OTHER STRONG THUNDERSTORMS WERE SOUTH OF OKLAHOMA CITY FROM THE NORMAN AREA TO NEAR RUSH SPRINGS. ELSEWHERE...RAIN COVERED MOST OF NORTHEAST OKLAHOMA AND EXTENDING SOUTHWEST THROUGH THE CENTRAL AND SOUTHWEST PORTIONS OF THE STATE. THE INDIVIDUAL STORMS WERE MOVING NORTH AT 30 MILES AN HOUR WHILE THE OVERALL AREA OF RAIN WAS MOVING EAST AT 20 MILES AN HOUR. PERSONS IN LOW LYING AREA SHOULD TAKE EXTREME CAUSION OF POSSIBLE FLOODING. IF FLOODING IS OCCURING IN YOUR AREA...DO NOT ATTEMPT TO CROSS SAID AREAS. MOVE TO HIGHER GROUNDS. MOTORIST SHOULD BE ON THE ALERT FOR FAST MOVING STREAMS OVER ROADWAYS.
Special weather statement, May 27, 9:06 PM CDT, 19 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WICHITA FALLS TX 900 PM CDT WED MAY 27 1987 ...A TORNADO WATCH IS IN EFFECT UNTIL 10PM CDT FOR THE FOLLOWING NORTH CENTRAL TEXAS COUNTIES..WICHITA..WILBARGER..HARDEMAN..FOARD..KNOX AND BAYLOR. A TORNADO WATCH IS IN EFFECT UNTIL 12 MIDNIGHT FOR THE FOLLOWING NORTH CENTRAL TEXAS COUNTIES..CLAY..MONTAGUE..ARCHER AND YOUNG. THUNDERSTORMS PRODUCING LOCALLY VERY HEAVY RAINS CONTINUED TO BATTER PORTIONS OF WICHITA COUNTY DURING THE 8 TO 9PM CDT TIME FRAME. OTHER THUNDERSTORMS OF NOTE WERE IN PROGRESS IN THE HENRIETTA..ARCHER CITY AND OLNEY VICINITIES. THESE THUNDERSTOMS WERE MOVING OFF TO THE NORTHEAST AND WILL BE MOSTLY CONFINED TO SOUTH CENTRAL OKLAHOMA BY 10 CDT. IN THE MEANTIME..ALMOST AN INCH AND ONE/HALF OF RAIN HAS BEEN MEASURED AT THE WICHITA FALLS AIRPORT TODAY..MOST OF WHICH AS FALLEN IN THE PAST THREE HOURS. LOCALIZED FLOODING WAS UNDERWAY IN THE WICHITA FALLS ARCEA. ELSEWHERE..AN ISOLATED SEVERE THUNDERSTORM WAS IN PROGRESS IN STONEWALL COUNTY..MOVEMENT WAS NORTH AND NORTHEAST..WARNINGS MAY BE REQUIRED FOR PERSONS IN KNOX COUNTY IN THE NEXT HOUR.
The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 27, 9:25 PM CDT | Flash Flood Warning | OUN | Canadian, Cleveland, Logan, Oklahoma | 3 hr |
| May 27, 9:25 PM CDT | Flash Flood Warning | OUN | McClain | 3 hr |
| May 27, 9:25 PM CDT | Flash Flood Warning | OUN | Caddo | 3 hr |
| May 27, 10:15 PM CDT | Flash Flood Warning | OUN | Garvin | 2 hr |
| May 28, 1:15 PM CDT | Flash Flood Warning | OUN | Caddo, Comanche, Grady, Kiowa | 3 hr |
| May 28, 1:15 PM CDT | Flash Flood Warning | OUN | Cotton, Jefferson, Stephens, Tillman | 3 hr |
| May 28, 1:15 PM CDT | Flash Flood Warning | OUN | Jackson | 3 hr |
| May 28, 1:58 PM CDT | Flash Flood Warning | OUN | Canadian, Logan, Oklahoma | 2 hr |
| May 28, 1:58 PM CDT | Flash Flood Warning | OUN | Cleveland, Garvin, McClain | 2 hr |
| May 28, 3:54 PM CDT | Flash Flood Warning | OUN | Caddo, Comanche, Cotton, Grady, Kiowa, Stephens and 1 more | 4 hr |
| May 28, 3:54 PM CDT | Flash Flood Warning | OUN | Canadian, Cleveland, Kingfisher, Logan, McClain, Oklahoma | 4 hr |
| May 28, 3:54 PM CDT | Flash Flood Warning | OUN | Jefferson | 4 hr |
| May 28, 3:54 PM CDT | Flash Flood Warning | OUN | Garvin | 4 hr |
| May 28, 3:54 PM CDT | Flash Flood Warning | OUN | Jackson | 4 hr |
Nearby
Flash Flood Warnings in Oklahoma, 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.