Alert archive / Arkansas / Severe Thunderstorm Watches in 2004

Severe Thunderstorm Watch 49

April 7, 200429 counties in Arkansas; Choctaw County, McCurtain County, Pushmataha County, Oklahoma; 7 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at Apr 7, 2004, 3:05 PM CDT for 29 counties in Arkansas; Choctaw County, McCurtain County, Pushmataha County, Oklahoma; 7 counties in Texas. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Apr 7, 2004, 3:05 PM CDT (20:05 UTC)
Expired
Apr 7, 2004, 8:00 PM CDT
In force
5 hr
Issued by
the Storm Prediction Center
All 39 counties

Arkansas County, AR, Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Clark County, AR, Cleveland County, AR, Columbia County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Garland County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Jefferson County, AR, Lafayette County, AR, Lincoln County, AR, Little River County, AR, Miller County, AR, Montgomery County, AR, Nevada County, AR, Ouachita County, AR, Pike County, AR, Polk County, AR, Saline County, AR, Sevier County, AR, Union County, AR, Choctaw County, OK, McCurtain County, OK, Pushmataha County, OK, Bowie County, TX, Delta County, TX, Franklin County, TX, Hopkins County, TX, Lamar County, TX, Red River County, TX, Titus County, TX

The radar

The Western Arkansas radar (KSRX), 138 km from the middle of the area, began a volume at 20:07 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

Warnings issued inside it

22 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Apr 7, 3:13 PM CDTSevere Thunderstorm WarningSHVUnion32 min
Apr 7, 3:38 PM CDTSevere Thunderstorm WarningTSAChoctaw52 min
Apr 7, 3:53 PM CDTSevere Thunderstorm WarningSHVUnion37 min
Apr 7, 4:09 PM CDTSevere Thunderstorm WarningJANAshley56 min
Apr 7, 4:20 PM CDTSevere Thunderstorm WarningSHVSevier40 min
Apr 7, 4:24 PM CDTSevere Thunderstorm WarningLZKPolk61 min
Apr 7, 4:24 PM CDTSevere Thunderstorm WarningSHVLittle River66 min
Apr 7, 4:27 PM CDTSevere Thunderstorm WarningSHVTitus48 min
Apr 7, 4:43 PM CDTSevere Thunderstorm WarningLZKBradley32 min
Apr 7, 4:43 PM CDTSevere Thunderstorm WarningSHVHempstead, Howard32 min
Apr 7, 4:55 PM CDTSevere Thunderstorm WarningLZKCleveland45 min
Apr 7, 5:05 PM CDTSevere Thunderstorm WarningJANAshley45 min
Apr 7, 5:12 PM CDTSevere Thunderstorm WarningSHVHempstead, Howard63 min
Apr 7, 5:15 PM CDTSevere Thunderstorm WarningLZKPike45 min
Apr 7, 5:48 PM CDTSevere Thunderstorm WarningSHVNevada57 min
Apr 7, 6:12 PM CDTSevere Thunderstorm WarningSHVColumbia48 min
Apr 7, 6:14 PM CDTSevere Thunderstorm WarningLZKOuachita51 min
Apr 7, 6:50 PM CDTSevere Thunderstorm WarningSHVMiller55 min
Apr 7, 7:00 PM CDTSevere Thunderstorm WarningLZKCalhoun45 min
Apr 7, 7:04 PM CDTSevere Thunderstorm WarningSHVUnion56 min
Apr 7, 7:08 PM CDTSevere Thunderstorm WarningSHVColumbia, Lafayette52 min
Apr 7, 7:38 PM CDTSevere Thunderstorm WarningLZKBradley42 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 8.1 hours before the alert went out and 180 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, Shreveport, LA at 12:00Z on 2004-04-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 138 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, Shreveport, LA at 12:00Z on 2004-04-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 22 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
138 J/kg
Mixed-layer CIN
-64 J/kg
Mixed-layer LCL
766 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
22 m²/s²
0-3 km storm-relative helicity
85 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
WWUS20 KWNS 072005
SEL9  
SPC WW 072005
ARZ000-OKZ000-TXZ000-080100-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 49
NWS STORM PREDICTION CENTER NORMAN OK
305 PM CDT WED APR 7 2004

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 

       CENTRAL/SOUTHERN ARKANSAS
       SOUTHEAST OKLAHOMA
       NORTHEAST TEXAS

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 305 PM UNTIL
800 PM CDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 55 STATUTE MILES
NORTH AND SOUTH OF A LINE FROM 30 MILES NORTHWEST OF PARIS TEXAS
TO 45 MILES EAST SOUTHEAST OF PINE BLUFF ARKANSAS.

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA.
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES.

OTHER WATCH INFORMATION...CONTINUE...WW 48...

DISCUSSION...INCREASING POTENTIAL FOR SEVERE HAIL AND WIND DAMAGE AS
CONVECTION DEVELOPS OVER NE TX AND SE OK.  SEPARATE AREA OF TSTMS
OVER SRN AR/NRN LA MAY ALSO PRODUCE SEVERE HAIL.  VERTICAL SHEAR
PROFILES FAVOR BOTH SUPERCELL AND BOW MORPHOLOGIES.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM
MOTION VECTOR 25025.


...EDWARDS/THOMPSON

344,0954 344,0911 330,0911 330,0954

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 7, 12:58 PM CDTMesoscale DiscussionSPCClark, Columbia, Hempstead, Howard, Lafayette, Little River and 7 more2 hr
Apr 7, 6:08 PM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 23 more67 min
Apr 6, 8:21 PM CDTMesoscale DiscussionSPCCollin, Dallas, Denton, Ellis, Henderson, Hill and 12 more2 hr
Apr 7, 2:45 PM CDTSevere Thunderstorm WatchSPCAnderson, Angelina, Brazos, Camp, Cherokee, Freestone and 22 more5 hr

Nearby

Severe Thunderstorm Watches in Arkansas, 2004Severe Thunderstorm Watches in Texas, 2004Severe Thunderstorm Watches in Oklahoma, 2004Every severe thunderstorm watch in 2004

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; radar from the NEXRAD Level II archive.