Alert archive / Oklahoma / Flash Flood Warnings in 1987
Flash Flood Warning 7, NWS Norman, OK
NWS Norman, OK issued this flash flood warning at May 27, 1987, 3:00 PM CDT for Canadian County, Logan County, Oklahoma County, Oklahoma. It was in force for 3 hr.
The area
The counties it named.
The facts
- Issued
- May 27, 1987, 3:00 PM CDT (20:00 UTC)
- Expired
- May 27, 1987, 5:45 PM CDT
- In force
- 3 hr
- Issued by
- NWS Norman, OK
- Area
- Whole counties
Counties Canadian County, OK, Logan County, OK, Oklahoma 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 12:00Z, 8.0 hours before the alert went out and 30 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
- 388 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 599 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 159 m²/s²
- 0-3 km storm-relative helicity
- 115 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 KOKC 271948
FFWOKC
OKC017-083-109-272245-
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
300 PM CDT WED MAY 27 1987
THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING
EFFECTIVE UNTIL 545 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES...
IN CENTRAL OKLAHOMA
...CANADIAN...SOUTHERN LOGAN...OKLAHOMA
THUNDERSTORMS CONTINUE OVER A LARGE PART OF CENTRAL OKLAHOMA...AND
ADDITIONAL THUNDERSTORMS HAVE BEEN FORMING OVER PARTS OF SOUTHWESTERN
OKLAHOMA AND HAVE BEEN MOVING INTO THE WATCH AREA DURING THE PAST TWO
HOURS. RAINFALL OF TWO TO THREE INCHES HAS FALLEN IN THE AFFECTED
AREA SINCE THIS MORNING...AND THE SOIL WAS NEARLY SATURATED
FROM PREVIOUS HEAVY RAINFALL OVER THE PAST FEW DAYS. AN ADDITIONAL
ONE TO TWO INCHES OF RAIN CAN BE EXPECTED BEFORE THE PRECIPITATION
DIMINISHES LATE THIS AFTERNOON.
STREET FLOODING IS LIKELY TO CONTINUE OVER THE OKLAHOMA CITY
METROPOLITAN AREA...AND FLOOD-PRONE CREEKS WILL RISE RAPIDLY WITH THE
ADDITIONAL RAINFALL. PERSONS RESIDING IN LOW-LYING AREAS SHOULD TAKE
PRECAUTIONS TO MOVE PERSONAL PROPERTY TO HIGHER GROUND. MOTORISTS
SHOULD BE ALERT TO THE POSSIBILITY OF FLOODED INTERSECTIONS DURING
THE AFTERNOON RUSH HOUR AND SHOULD REDUCE SPEED TO AVOID HYDROPLANING
ON THE WET ROADWAYS.
ADDITIONAL RAINFALL MAY OCCUR LATER TODAY AND TONIGHT IN CENTRAL
OKLAHOMA...AND VIRTUALLY ALL OF THE RAIN WILL RUN OFF RAPIDLY. STAY
TUNED TO NOAA WEATH3ER RADIO OR TO COMMERCIAL RADIO OR TELEVISION FOR L
UPDATES AND POSSIBLE WARNINGS.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, 1:55 PM CDT, 1 hour 5 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WICHITA FALLS TX 155 PM CDT WED MAY 27 1987 AT 150 PM CDT AN AREA OF NUMEROUS SHOWERS AND ISOLATED VERY STRONG THUNDERSTORMS STRETCHED 50 MILES EITHER SIDE OF A LINE FROM MUNDAY TEXAS TO CRESCENT OKLAHOMA. THE STRONGEST STORMS IN NORTH TEXAS WERE LOCATED TO THE WEST OF LAKE KICKAPOO...SOUTH OF SEYMOUR AND OVER SOUTHERN WILBARGER COUNTY. STORMS WITHIN THESE AREAS ARE CAPABLE OF PRODUCING ALONG WITH VERY HEAVY RAINS AND FREQUENT LIGHTNING SOME GUSTY WINDS AND POSSIBLE SMALL HAIL. OTHER VERY STRONG STORMS WERE DEVELOPING OVER THE TEXAS SOUTH PLAINS BETWEEN DICKENS AND GUTHRIE. ALL PRECIPITATION MOVING NORTHEAST AT 30 MPH. RESIDENTS ACVROSS NORTH TEXAS SHOULD CONTINUE TO MONITOR THIS AFTERNOON WEATHER SINCE THE POTENTIAL FOR SEVERE EXISTS ACROSS THE AREA.
Special weather statement, May 27, 1:58 PM CDT, 1 hour 2 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WICHITA FALLS TX 155 PM CDT WED MAY 27 1987 AT 150 PM CDT AN AREA OF NUMEROUS SHOWERS AND ISOLATED VERY STRONG THUNDERSTORMS STRETCHED 50 MILES EITHER SIDE OF A LINE FROM MUNDAY TEXAS TO CRESCENT OKLAHOMA. THE STRONGEST STORMS IN NORTH TEXAS WERE LOCATED TO THE WEST OF LAKE KICKAPOO...SOUTH OF SEYMOUR AND OVER SOUTHERN WILBARGER COUNTY. STORMS WITHIN THESE AREAS ARE CAPABLE OF PRODUCING ALONG WITH VERY HEAVY RAINS AND FREQUENT LIGHTNING SOME GUSTY WINDS AND POSSIBLE SMALL HAIL. OTHER VERY STRONG STORMS WERE DEVELOPING OVER THE TEXAS SOUTH PLAINS BETWEEN DICKENS AND GUTHRIE. ALL PRECIPITATION MOVING NORTHEAST AT 30 MPH. RESIDENTZS ACROSS NORTH TEXAS SHOULD CONTINUE TO MONITOR THIS AFTERNOON WEATHER SINCE THE POTENTIAL FOR SEVERE WEATHER EXISTS ACROSS THE AREA.
Special weather statement, May 27, 1:59 PM CDT, 1 hour 1 minute before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
145 PM CDT WED MAY 27 1987
...A FLASH FLOOD WATCH IS IN EFFECT FOR THE NORTHWEST ONE-THIRD OF
OKLAHOMA FOR TODAY...
AT 125 PM... A SOLID LINE OF THUNDERSTORMS THAT CONTAINED VERY HEAVY
RAINFALL EXTENDED ACROSS THE MIDDLE OF THE STATE FROM NEAR EL DORADO
KANSAS SOUTH TO FAIRFAX... CHANDLER... SHAWNEE AND EASTERN JEFFERSON
COUNTY OF OKLAHOMA.
TO THE WEST OF THE LINE OF THUNDERSTORMS... RAIN AND THUNDERSTORMS...
SOME WITH VERY HEAVY RAINFALL... COVERED MOST OF THE THE WESTERN HALF
OF OKLAHOMA.
THE HEAVIEST ACTIVITY WAS LOCATED OVER NORTHERN GRADY COUNTY AND OVER
MUCH OF OKLAHOMA... CLEVELAND... MCCLAIN... GARVIN AND STEPHENS
COUNTY. RADAR INDICATES THAT RAINFALL AMOUNTS OF ONE TO TWO INCHES
HAVE OCCURRED OVER MUCH OF CENTRAL OKLAHOMA... INCLUDING THE OKLAHOMA
CITY METRO AREA. SOME MINOR FLOODING OF SMALL STREAMS HAS BEEN RE-
PORTED IN SOUTHWEST OKLAHOMA CITY DURING THE PAST HOUR.
THE AR/EA OF THUNDERSTORMS WAS MOVING TO THE EAST AT 15 MILES AN HOUR.Special weather statement, May 27, 2:46 PM CDT, 14 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WICHITA FALLS TX 350 PM CDT WED MAY 27 1987 ...A TORNADO WATCH IS IN EFFECT FROM 3 PM CDT THIS AFTERNOON UNTIL 10 PM CDT THIS EVENING AND INCLUDES THE FOLLOWING COUNTIES IN NORTH CENTRAL TEXAS...ARCHER..BAYLOR..FOARD..HARDEMAN..KNOX..WICHITA.. WILBARGER..AND YOUNG... AT 345 PM THE WICHITA FALLS RADAR SHOWED AN AREA OF NUMEROUS SHOWERS AND SCATTERED VERY STRONG THUNDERSTORMS STRETCHED 40 TO 45 MILES EITHER SIDE OF A LINE FROM SEYMOUR TEXAS TO WATONGA OKLAHOMA. THE STRONGEST STORMS IN NORTHCENTRAL TEXAS WERE SCATTERED OVER THE SOUTHERN HALF OF WICHITA COUNTY AND OVER THE NORTHWESTERN ONE HALF OF ARCHER COUNTY. THUNDERSTORMS WITHIN THESE AREAS ARE CAPABLE OF PRODUCING VERY HEAVY RAINS...DANGEROUS LIGHTNING...STRONG WINDS AND SMALL HAIL. STORMS WERE MOVING TO THE NORTHEAST AT 25 MPH. ELSEWHERE VERY STRONG THUNDERSTORMS WERE DEVELOPING OVER THE SOUTH PLAINS FROM PADUCAH TO CLAIREMONT. RESIDENTS ACROSS THE AREA ARE ADVISED TO STAY ABREAST OF THIS AFTERNOONS WEATHER DUE TO THE POTENTIAL OF SEVERE WEATHER ACROSS THE REGION.
Special weather statement, May 27, 2:50 PM CDT, 10 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
245 PM CDT WED MAY 27 1987
...A FLASH FLOOD WATCH IS IN EFFECT FOR THE NORTHWEST ONE-THIRD OF
OKLAHOMA FOR TODAY...
AT 225 PM... AN EXTENSIVE AREA OF RAIN AND SCATTERED THUNDERSTORMS...
SOME WITH VERY HEAVY RAINFALL... COVERED MOST OF THE NORTHWEST TWO-
THIRDS OF OKLAHOMA AND SOUTH CENTRAL KANSAS. MOST OF THIS ACTIVITY
WAS WEST OF A LINE FROM CHANUTE KANSAS SOUTHWEST TO BARTLESVILLE...
STROUD... PAULS VALLEY AND JEFFERSON COUNTY OKLAHOMA.
THE HEAVIEST ACTIVITY WAS LOCATED OVER MOST OF GRADY... CANADIAN...
OKLAHOMA AND STEPHENS COUNTY. RADAR INDICATES THAT RAINFALL AMOUNTS
OF ONE TO TWO INCHES HAVE OCCURRED OVER MUCH OF CENTRAL OKLAHOMA...
INCLUDING THE OKLAHOMA CITY METRO AREA. OVER TWO INCHES OF RAIN HAS
FALLEN AT THE W,ILL ROGERS WORLD AIRPORT IN THE PAST TWO HOURS.
THE AREA OF THUNDERSTORMS WAS DRIFTING TO THE EAST AT 5 MILES AN
HOUR WHILE THE INDIVIDUAL THUNDERSTORMS WERE MOVING NORTHEAST
AT 25 MILES AN HOUR.Special weather statement, May 27, 2:50 PM CDT, 10 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WICHITA FALLS TX 250 PM CDT WED MAY 27 1987 ...A TORNADO WATCH IS IN EFFECT FROM 3 PM CDT THIS AFTERNOON UNTIL 10 PM CDT THIS EVENING AND INCLUDES THE FOLLOWING COUNTIES IN NORTH CENTRAL TEXAS...ARCHER..BAYLOR..FOARD..HARDEMAN..KNOX..WICHITA.. WILBARGER..AND YOUNG... AT 245 PM THE WICHITA FALLS RADAR SHOWED AN AREA OF NUMEROUS SHOWERS AND SCATTERED VERY STRONG THUNDERSTORMS STRETCHED 40 TO 45 MILES EITHER SIDE OF A LINE FROM SEYMOUR TEXAS TO WATONGA OKLAHOMA. THE STRONGEST STORMS IN NORTHCENTRAL TEXAS WERE SCATTERED OVER THE SOUTHERN HALF OF WICHITA COUNTY AND OVER THE NORTHWESTERN ONE HALF OF ARCHER COUNTY. THUNDERSTORMS WITHIN THESE AREAS ARE CAPABLE OF PRODUCING VERY HEAVY RAINS...DANGEROUS LIGHTNING...STRONG WINDS AND SMALL HAIL. STORMS WERE MOVING TO THE NORTHEAST AT 25 MPH. ELSEWHERE VERY STRONG THUNDERSTORMS WERE DEVELOPING OVER THE SOUTH PLAINS FROM PADUCAH TO CLAIREMONT. RESIDENTS ACROSS THE AREA ARE ADVISED TO STAY ABREAST OF THIS AFTERNOONS WEATHER DUE TO THE POTENTIAL OF SEVERE WEATHER ACROSS THE REGION.
The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 26, 8:25 PM CDT | Severe Thunderstorm Warning | OUN | Garfield | 65 min |
| May 26, 9:34 PM CDT | Flash Flood Warning | OUN | Alfalfa, Blaine, Dewey, Garfield, Major | 3 hr |
| May 26, 9:34 PM CDT | Flash Flood Warning | OUN | Custer | 3 hr |
| May 26, 9:34 PM CDT | Flash Flood Warning | OUN | Grant | 3 hr |
| May 26, 9:37 PM CDT | Severe Thunderstorm Warning | OUN | Kay | 43 min |
| May 26, 9:44 PM CDT | Severe Thunderstorm Warning | OUN | Garfield, Major | 46 min |
| May 26, 10:43 PM CDT | Severe Thunderstorm Warning | OUN | Caddo | 47 min |
| May 27, 12:28 AM CDT | Flash Flood Warning | OUN | Blaine, Custer, Dewey | 2 hr |
| May 27, 10:45 AM CDT | Flash Flood Warning | OUN | Garfield, Kingfisher | 3 hr |
| May 27, 5:33 PM CDT | Flash Flood Warning | OUN | Caddo | 4 hr |
| May 27, 5:33 PM CDT | Flash Flood Warning | OUN | Canadian, Cleveland, Logan, Oklahoma | 4 hr |
| May 27, 5:33 PM CDT | Flash Flood Warning | OUN | Grady, McClain | 4 hr |
| May 27, 6:08 PM CDT | Flash Flood Warning | OUN | Comanche, Kiowa | 3 hr |
| May 27, 6:08 PM CDT | Flash Flood Warning | OUN | Stephens | 3 hr |
| May 27, 6:56 PM CDT | Severe Thunderstorm Warning | OUN | Cleveland, Oklahoma | 34 min |
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.