Alert archive / Oklahoma / Flash Flood Warnings in 1987
Flash Flood Warning 21, NWS Norman, OK
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.
- 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
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.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 27, 9:25 PM CDT | Flash Flood Warning | OUN | Comanche, Grady, Stephens | 3 hr |
| 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 | 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.