Alert archive / Arkansas / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 149, NWS Tulsa, OK

May 21, 1990Scott County, Arkansas

NWS Tulsa, OK issued this severe thunderstorm warning at May 21, 1990, 5:44 AM CDT for Scott County, Arkansas. It was in force for 46 min.

The area

The counties it named.

The facts

Issued
May 21, 1990, 5:44 AM CDT (10:44 UTC)
Expired
May 21, 1990, 6:30 AM CDT
In force
46 min
Issued by
NWS Tulsa, OK
Area
Whole counties

County 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, 10.7 hours before the alert went out and 228 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°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Springfield, MO at 00:00Z on 1990-05-21The 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 211045
SVRFSM
ARC127-211130-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE FORT SMITH AR
544 AM CDT MON MAY 21 1990
 
THE NATIONAL WEATHER SERVICE IN FORT SMITH HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  630 AM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN WEST ARKANSAS
 
   ...SCOTT COUNTY
 
RADAR AT 544 AM CDT WAS SHOWING A SEVERE THUNDERSTORM 5 MILES WEST OF
WALDRON...MOVEMENT WAS SOUTHEAST AT 20 MPH.
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS.  HEAVY RAINS F4LOOD ROADS QUICKLY SO
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

The office that day

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

IssuedProductOfficeCountiesLasted
May 21, 12:39 AM CDTSevere Thunderstorm WarningTSAPolk, Scott66 min
May 21, 1:10 AM CDTFlash Flood WarningTSAPolk103 min
May 21, 1:42 AM CDTSevere Thunderstorm WarningTSAPolk63 min
May 21, 2:16 AM CDTSevere Thunderstorm WarningTSABenton59 min
May 21, 2:32 AM CDTSevere Thunderstorm WarningTSAWashington58 min
May 21, 3:13 AM CDTSevere Thunderstorm WarningTSACrawford, Madison62 min
May 21, 3:37 AM CDTSevere Thunderstorm WarningTSAWashington38 min
May 21, 3:56 AM CDTSevere Thunderstorm WarningTSAFranklin, Johnson, Sebastian64 min
May 21, 4:15 AM CDTSevere Thunderstorm WarningTSACrawford30 min
May 21, 4:50 AM CDTSevere Thunderstorm WarningTSALogan, Scott55 min
May 21, 4:58 AM CDTSevere Thunderstorm WarningTSASebastian47 min
May 21, 5:59 AM CDTSevere Thunderstorm WarningTSAPolk61 min

Nearby

Severe Thunderstorm Warnings in Arkansas, 1990Every severe thunderstorm 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.