Alert archive / Oklahoma / Flash Flood Warnings in 1990

Flash Flood Warning 29, NWS Tulsa, OK

May 21, 1990LeFlore County, Oklahoma

NWS Tulsa, OK issued this flash flood warning at May 21, 1990, 12:28 AM CDT for LeFlore County, Oklahoma. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
May 21, 1990, 12:28 AM CDT (05:28 UTC)
Expired
May 21, 1990, 3:30 AM CDT
In force
3 hr
Issued by
NWS Tulsa, OK
Area
Whole counties

County LeFlore 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

Springfield, MO (KUMN), launched 00:00Z, 5.5 hours before the alert went out and 237 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, Springfield, MO at 00:00Z on 1990-05-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2299 joules per kilogram.LCLLFCEL10008507005003002001001 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, Springfield, MO at 00:00Z on 1990-05-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 37 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
2299 J/kg
Mixed-layer CIN
-15 J/kg
Mixed-layer LCL
1348 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
37 m²/s²
0-3 km storm-relative helicity
196 m²/s²
Significant tornado parameter
0.7
Supercell composite
7.8

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KFSM 210530
FFWFSM
OKC079-210830-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE FORT SMITH AR
1228 AM CDT MON MAY 21 1990
 
THE NATIONAL WEATHER SERVICE IN FORT SMITH HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  330 AM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN SOUTHEAST OKLAHOMA
 
   ...SOUTHERN LE FLORE COUNTY
 
A LINE OF THUNDERSTORMS EXTENDS ACROSS EXTREME SOUTHERN LEFLORE
COUNTY. THESE THUNDERSTORMS CONTINUE TO RAIN OVER THE SAME AREAS.
LOCALLY HEAVY RAINFALL IS LIKELY. DRIVERS SHOULD BE PARTICULARLY
ALERT.
 
 
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.
 
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 SQAFELY.  VEHICLES CAUGHT IN RISING WATER SHOULD BE
ABANDONED QUICKLY.  MOVE TO HIGHER GROUND.

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

Local storm report, May 20, 10:14 PM CDT, 2 hours 14 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE TULSA, OK
1011 PM CDT SUN MAY 20 1990

TIME/CDT     COUNTY      EVENT

9 35 PM      OTTAWA      DIME TO NICKEL SIZE HAIL AT QUAPAW.
9 50 PM      OTTAWA      QUARTER SqIZE HAIL AT TURNPIKE TOLL BOOTH
                         ON OKLAHOMA-MISSOURI LINE. REPORTED THE HAIL
                         FALLING IN BOTH STATES.

The office that day

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

IssuedProductOfficeCountiesLasted
May 20, 9:29 PM CDTSevere Thunderstorm WarningTSAOttawa46 min
May 20, 11:26 PM CDTSevere Thunderstorm WarningTSADelaware34 min
May 20, 11:32 PM CDTSevere Thunderstorm WarningTSALeFlore58 min
May 21, 12:39 AM CDTSevere Thunderstorm WarningTSALeFlore66 min
May 21, 2:27 AM CDTSevere Thunderstorm WarningTSACherokee, Muskogee48 min
May 21, 2:32 AM CDTSevere Thunderstorm WarningTSASequoyah58 min
May 21, 2:36 AM CDTSevere Thunderstorm WarningTSAAdair39 min
May 21, 3:27 AM CDTSevere Thunderstorm WarningTSALeFlore, Sequoyah63 min
May 21, 4:28 AM CDTSevere Thunderstorm WarningTSALeFlore62 min
May 21, 5:27 AM CDTSevere Thunderstorm WarningTSALeFlore63 min

Nearby

Flash Flood Warnings in Oklahoma, 1990Every 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.