Alert archive / Oklahoma / Flash Flood Warnings in 1987

Flash Flood Warning 21, NWS Norman, OK

May 28, 1987Canadian County, Logan County, Oklahoma County, Oklahoma

NWS Norman, OK issued this flash flood warning at May 28, 1987, 1:58 PM CDT for Canadian County, Logan County, Oklahoma County, Oklahoma. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued
May 28, 1987, 1:58 PM CDT (18:58 UTC)
Expired
May 28, 1987, 4:00 PM CDT
In force
2 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, 7.0 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 1987-05-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°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 1987-05-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 51 square meters per square second.19395878Sfc1 km3 km6 km9 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1064 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
51 m²/s²
0-3 km storm-relative helicity
69 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 281858
FFWOKC
OKC017-027-083-087-109-049-282100-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
158 PM CDT THU MAY 28 1987
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING
EFFECTIVE UNTIL  400 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES...
 
IN CENTRAL OKLAHOMA
          ...CANADIAN...CLEVELAND...LOGAN
          ...MCCLAIN...OKLAHOMA
IN SOUTHEAST OKLAHOMA
          ...GARVIN
 
HEAVY RAIN PRODUCING THUNDERSTORMS WILL BE MOVING THROUGH CENTRAL
OKLAHOMA DURING THE NEXT FEW HOURS. THESE STORMS ARE MOVING FAIRLY
FAST BUT WITH MANY CREEKS AND STREAMS ALREADY FLOODED...ADDITIONAL
FLASH FLOODING IS LIKELY IN THE WARNED COUNTIES.
 
 
 
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.

The office that day

Everything else NWS Norman, OK issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 27, 9:25 PM CDTFlash Flood WarningOUNComanche, Grady, Stephens3 hr
May 27, 9:25 PM CDTFlash Flood WarningOUNCanadian, Cleveland, Logan, Oklahoma3 hr
May 27, 9:25 PM CDTFlash Flood WarningOUNMcClain3 hr
May 27, 9:25 PM CDTFlash Flood WarningOUNCaddo3 hr
May 27, 10:15 PM CDTFlash Flood WarningOUNGarvin2 hr
May 28, 1:15 PM CDTFlash Flood WarningOUNCaddo, Comanche, Grady, Kiowa3 hr
May 28, 1:15 PM CDTFlash Flood WarningOUNCotton, Jefferson, Stephens, Tillman3 hr
May 28, 1:15 PM CDTFlash Flood WarningOUNJackson3 hr
May 28, 1:58 PM CDTFlash Flood WarningOUNCleveland, Garvin, McClain2 hr
May 28, 3:54 PM CDTFlash Flood WarningOUNCaddo, Comanche, Cotton, Grady, Kiowa, Stephens and 1 more4 hr
May 28, 3:54 PM CDTFlash Flood WarningOUNCanadian, Cleveland, Kingfisher, Logan, McClain, Oklahoma4 hr
May 28, 3:54 PM CDTFlash Flood WarningOUNJefferson4 hr
May 28, 3:54 PM CDTFlash Flood WarningOUNGarvin4 hr
May 28, 3:54 PM CDTFlash Flood WarningOUNJackson4 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.