Alert archive / Oklahoma / Flash Flood Warnings in 1990

Flash Flood Warning 21, NWS Shreveport, LA

May 3, 1990McCurtain County, Oklahoma

NWS Shreveport, LA issued this flash flood warning at May 3, 1990, 2:10 AM CDT for McCurtain County, Oklahoma. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued: May 3, 1990, 2:10 AM CDT (07:10 UTC)
Expired: May 3, 1990, 8:15 AM CDT
In force: 6 hr
Issued by: NWS Shreveport, LA
Area: Whole counties

County McCurtain 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

Longview/Gregg, TX (KGGG), launched 00:00Z, 7.2 hours before the alert went out and 197 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 498 J/kg
Mixed-layer CIN: -29 J/kg
Mixed-layer LCL: 1063 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 230 m²/s²
0-3 km storm-relative helicity: 443 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 8.6

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KSHV 030711
FFWSHV
OKC089-031315-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
210 AM CDT THU MAY 3 1990
 
THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  815 AM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS..
 
IN SOUTHEAST OKLAHOMA
 
   ...MCCURTAIN COUNTY
 
AT 200 AM CDT THE NATIONAL WEATHER SERVICE RADAR IN SHREVEPORT SHOWED
A LARGE AREA OF NUMEROUS SHOWERS AND THUNDERSTORMS THAT EXTENDED WEST
OF A LINE FROM NEAR MURFREESBORO ARKANSAS TO ASHDOWN ARKANSAS TO NEAR
DANGERFIELD TEXAS TO GILMER TEXAS TO PALESTINE TEXAS ON SOUTHWEST.
 
A BAND OF THUNDERSTORMS THAT WERE LIKELY PRODUCING HAIL...HIGH
WINDS...VERY HEAVY RAINS AND FREQUENT LIGHTNING WERE NOTED FROM
SOUTH OF HUGO OKLAHOMA TO SULPHUR SPRINGS TEXAS.
 
MOVEMENT OF THE SHOWERS AND THUNDERSTORMS WAS EAST NORTHEAST NEAR
35 MILES AN HOUR.
 
DUE TO THE HEAVY RAINS THAT FELL DURING THE PAST 24 HOURS OVER THE
WARNED AREA AND THE RETURN OF MODERATE TO HEAVY RAINS ACROSS THE
WARNED AREA...FLOODING WILL DEVELOP RAPIDLY. THE GROUND IS SATURATED
AND WATER IS RUNNING RATHER HIGH IN THE STREAMS AND BAYOUS THUS
ALL THE RAIN WILL BE RUNOFF AND SOME STREAMS MAY LEAVE THEIR BANKS.
 
 
 
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE
THE DANGERS OF FLOODS AND FLASH FLOODS.  IF FLASH FLOODING IS
OBSERVED...ACT QUICKLY.  MOVE UP TO ESCAPE FLOOD WATERS.  DO
NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

The office that day

Everything else NWS Shreveport, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 3, 12:07 AM CDT	Severe Thunderstorm Warning	SHV	McCurtain	68 min

Nearby

Flash Flood Warnings in Oklahoma, 1990 Every flash flood warning in 1990

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.