Alert archive / Oklahoma / Flash Flood Warnings in 1990

Flash Flood Warning 27, NWS Tulsa, OK

May 20, 1990LeFlore County, Oklahoma

NWS Tulsa, OK issued this flash flood warning at May 20, 1990, 12:54 AM CDT for LeFlore County, Oklahoma. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued: May 20, 1990, 12:54 AM CDT (05:54 UTC)
Expired: May 20, 1990, 4:00 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, 5.9 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-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: 2736 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 712 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 89 m²/s²
0-3 km storm-relative helicity: 151 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 5.2

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KFSM 200555
FFWFSM
OKC079-200900-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE FORT SMITH AR
1254 AM CDT SUN MAY 20 1990
 
THE NATIONAL WEATHER SERVICE IN FORT SMITH HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  400 AM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN SOUTHEAST OKLAHOMA
 
   ...LE FLORE COUNTY
 
CONTINOUS SLOW MOVING THUNDERSTORMS ACROSS LEFLORE COUNTY WILL
CAUSE FLASH FLOODING IN LOW LYING FLOOD PRONE AREAS. REPORTS OF
OVER 2 INCHES OF RAIN IN LAST THREE HOURS WITH MORE MOVING IN
THE AREA WILL ADD TO THE FLOODING.
 
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.
 
A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS
IMMINENT.  MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES.  DO NOT
ATTEMPT TO CROSS BRIDGES...DIPS...OR LOW SPOTS IF WATER COVERS
THE ROADWAY.  NEVER TRY TO CROSS A FLOWING STREAM...EVEN A SMALL
ONE...ON FOOT.  TO ESCAPE RISING WATER MOVE UP 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 19, 8:45 PM CDT, 4 hours 9 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE TULSA, OK
835 PM CDT SAT MAY 19 1990

TIME/CDT     COUNTY      EVENT

6 10 PM      DELAWARE    GOLFBALL SIZE HAIL 5 MILES SOUTH CLEORA.
6 25 PM      CREEK       GOLFBALL SIZE HAIL 2 MILES SOUTH DRUMRIGHT.
6 40 PM      CREEK       GOLFBALL SIZE HAIL AT DRUMRIGHT.
6 40 PM      MAYES       NICKEL SIZE HAIL AT LOCUST GROVE.
6 40 PM      MUSKOGEE    DIME SIZE HAIL AT HASKELL.
7 15 PM      MUSKOGEE    HALF DOLLAR SIZE HAIL COVERING GROUND 4 MILES
                         SOUTHEAST OF JAMESVILLE.
7 20 PM      OKMULGEE    60-70 MPH WINDS AND GOLFBALL SIZE HAIL 3 MILES
                         EAST OF BALDHILL.
7 45 PM      MUSKOGEE    DIME SIZE HAIL 3 MILES SOUTH BOYNTON.
7 55 PM      OKMULGEE    GOLFBALL SIZE HAIL AT MORRIS.
8 25 PM      MUSKOGEE    DIME SIZE HAIL AT MUSKOGEE.
8 38 PM      MUSKOGEE    GOLFBALL SIZE HAIL AT KEEFETON.

Local storm report, May 19, 10:11 PM CDT, 2 hours 43 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE TULSA, OK
1006 PM CDT SAT MAY 19 1990

TIME/CDT     COUNTY      EVENT

8 48 PM      MCINTOSH    GOLFBALL SIZE HAIL AT EUFAULA.
9 00 PM      OKMULGEE    DIME SIZE HAIL 4 MILES SOUTH OKMULGEE.

The office that day

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

Issued	Product	Office	Counties	Lasted
May 19, 7:31 PM CDT	Severe Thunderstorm Warning	TSA	Muskogee, Okmulgee	59 min
May 19, 8:34 PM CDT	Severe Thunderstorm Warning	TSA	McIntosh, Muskogee, Okfuskee, Okmulgee	56 min
May 19, 9:09 PM CDT	Severe Thunderstorm Warning	TSA	Sequoyah	66 min
May 19, 9:52 PM CDT	Severe Thunderstorm Warning	TSA	LeFlore	68 min
May 19, 10:15 PM CDT	Severe Thunderstorm Warning	TSA	Sequoyah	60 min
May 20, 12:03 AM CDT	Severe Thunderstorm Warning	TSA	LeFlore	30 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.