Alert archive / Arkansas / Flash Flood Warnings in 1990

Flash Flood Warning 28, NWS Tulsa, OK

May 20, 1990Polk County, Scott County, Arkansas

NWS Tulsa, OK issued this flash flood warning at May 20, 1990, 1:40 AM CDT for Polk County, Scott County, Arkansas. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued
May 20, 1990, 1:40 AM CDT (06:40 UTC)
Expired
May 20, 1990, 3:45 AM CDT
In force
2 hr
Issued by
NWS Tulsa, OK
Area
Whole counties

Counties Polk County, AR, Scott County, AR

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, 6.7 hours before the alert went out and 250 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 1990-05-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2736 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Springfield, MO at 00:00Z on 1990-05-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 89 square meters per square second.193958Sfc1 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
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 200641
FFWFSM
ARC113-127-200845-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE FORT SMITH AR
140 AM CDT SUN MAY 20 1990
 
THE NATIONAL WEATHER SERVICE IN FORT SMITH HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  345 AM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN SOUTHWEST ARKANSAS
 
   ...POLK COUNTY
 
IN WEST ARKANSAS
 
   ...SCOTT COUNTY
 
THUNDERSTORMS WITH HEAVY RAIN ARE MOVING SLOWLY ACROSS SCOTT AND POLK
COUNTIES OF ARKANSAS. GROUNDS ALREADY WET WILL ALLOW RAPID RUN OFF OF
HEAVY RAINS CAUSING SOME FLASH 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
8ATTEMPT 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.

The office that day

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

IssuedProductOfficeCountiesLasted
May 19, 7:26 PM CDTSevere Thunderstorm WarningTSAScott, Sebastian64 min
May 19, 7:48 PM CDTSevere Thunderstorm WarningTSABenton, Washington57 min
May 19, 9:09 PM CDTSevere Thunderstorm WarningTSASebastian66 min
May 19, 9:45 PM CDTSevere Thunderstorm WarningTSALogan60 min
May 19, 9:52 PM CDTSevere Thunderstorm WarningTSACrawford68 min
May 19, 10:15 PM CDTSevere Thunderstorm WarningTSASebastian60 min
May 19, 10:28 PM CDTFlash Flood WarningTSACrawford, Franklin, Sebastian3 hr
May 19, 11:42 PM CDTFlash Flood WarningTSALogan3 hr

Nearby

Flash Flood Warnings in Arkansas, 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.