Alert archive / Oklahoma / Flash Flood Warnings in 1987

Flash Flood Warning 7, NWS Norman, OK

May 27, 1987Canadian County, Logan County, Oklahoma County, Oklahoma

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.

Skew-T log-pSkew-T log-p diagram, Ok Cty/Will Rgrs, OK at 12:00Z on 1987-05-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 388 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Ok Cty/Will Rgrs, OK at 12:00Z on 1987-05-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 159 square meters per square second.19395878Sfc1 km3 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
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

Open this sounding in Storm Lab

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.

IssuedProductOfficeCountiesLasted
May 26, 8:25 PM CDTSevere Thunderstorm WarningOUNGarfield65 min
May 26, 9:34 PM CDTFlash Flood WarningOUNAlfalfa, Blaine, Dewey, Garfield, Major3 hr
May 26, 9:34 PM CDTFlash Flood WarningOUNCuster3 hr
May 26, 9:34 PM CDTFlash Flood WarningOUNGrant3 hr
May 26, 9:37 PM CDTSevere Thunderstorm WarningOUNKay43 min
May 26, 9:44 PM CDTSevere Thunderstorm WarningOUNGarfield, Major46 min
May 26, 10:43 PM CDTSevere Thunderstorm WarningOUNCaddo47 min
May 27, 12:28 AM CDTFlash Flood WarningOUNBlaine, Custer, Dewey2 hr
May 27, 10:45 AM CDTFlash Flood WarningOUNGarfield, Kingfisher3 hr
May 27, 5:33 PM CDTFlash Flood WarningOUNCaddo4 hr
May 27, 5:33 PM CDTFlash Flood WarningOUNCanadian, Cleveland, Logan, Oklahoma4 hr
May 27, 5:33 PM CDTFlash Flood WarningOUNGrady, McClain4 hr
May 27, 6:08 PM CDTFlash Flood WarningOUNComanche, Kiowa3 hr
May 27, 6:08 PM CDTFlash Flood WarningOUNStephens3 hr
May 27, 6:56 PM CDTSevere Thunderstorm WarningOUNCleveland, Oklahoma34 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.