Alert archive / Arkansas / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 182

April 29, 200222 counties in Arkansas; 8 counties in Mississippi

The Storm Prediction Center issued this severe thunderstorm watch at Apr 29, 2002, 3:00 PM CDT for 22 counties in Arkansas; 8 counties in Mississippi. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Apr 29, 2002, 3:00 PM CDT (20:00 UTC)
Expired
Apr 29, 2002, 8:00 PM CDT
In force
5 hr
Issued by
the Storm Prediction Center
All 30 counties

Arkansas County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Clark County, AR, Cleveland County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Garland County, AR, Grant County, AR, Hot Spring County, AR, Jefferson County, AR, Lincoln County, AR, Lonoke County, AR, Nevada County, AR, Ouachita County, AR, Perry County, AR, Phillips County, AR, Pike County, AR, Pulaski County, AR, Saline County, AR, Bolivar County, MS, Coahoma County, MS, Humphreys County, MS, Leflore County, MS, Quitman County, MS, Sunflower County, MS, Tallahatchie County, MS, Washington County, MS

The radar

The Little Rock radar (KLZK), 67 km from the middle of the area, began a volume at 20:00 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

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

IssuedProductOfficeCountiesLasted
Apr 29, 3:07 PM CDTSevere Thunderstorm WarningLZKCleveland38 min
Apr 29, 6:20 PM CDTSevere Thunderstorm WarningJANBolivar25 min
Apr 29, 6:58 PM CDTSevere Thunderstorm WarningJANBolivar, Washington32 min

The nearest sounding before it

Little Rock, AR (KLZK), launched 12:00Z, 8.0 hours before the alert went out and 206 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, Little Rock, AR at 12:00Z on 2002-04-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Little Rock, AR at 12:00Z on 2002-04-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 74 square meters per square second.1939587897117Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1917 m above ground
0-6 km bulk shear
59 kt
0-1 km storm-relative helicity
74 m²/s²
0-3 km storm-relative helicity
204 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.1

Open this sounding in Storm Lab

The text

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

000
WWUS20 KWNS 291942
SEL2  
SPC WW 291934
ARZ000-MSZ000-300100-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 182
STORM PREDICTION CENTER NORMAN OK
234 PM CDT MON APR 29 2002

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

   SOUTHERN AND CENTRAL ARKANSAS                           
   NORTHWEST AND WEST CENTRAL MISSISSIPPI                        

EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 300 PM UNTIL 800
PM CDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 60
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 50 STATUTE MILES
EITHER SIDE OF A LINE FROM 25 MILES WEST OF HOT SPRINGS ARKANSAS TO
5 MILES NORTH NORTHEAST OF GREENWOOD MISSISSIPPI.

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...THIS SEVERE THUNDERSTORM WATCH REPLACES
SEVERE THUNDERSTORM WATCH NUMBER 181.  WATCH NUMBER 181 WILL NOT BE
IN EFFECT AFTER 300 PM CDT.

DISCUSSION...STRONG/SEVERE THUNDERSTORMS HAVE REDEVELOPED OVER
PARTS OF CENTRAL AR TO THE NORTH OF THE SURFACE FRONT IN ZONE OF
WEAK LOW LEVEL WARM ADVECTION.  WIND FIELDS VEER AND INCREASE WITH
HEIGHT RESULTING IN STRONG DEEP LAYER SHEAR AND FAVORABLE
ENVIRONMENT FOR ELEVATED SUPERCELLS.  THE PRIMARY THREAT IS
EXPECTED TO BE LARGE HAIL...HOWEVER IF CELLS CAN DEVELOP FARTHER
SOUTH TOWARD THE FRONT AND BECOME SURFACE BASED...THREAT FOR STRING
WIND GUSTS WOULD INCREASE. 

ADDITIONAL WATCHES...STORMS CONTINUE TO DEVELOP NEAR THE FRONT FROM
SERN MS INTO THE FL PANHANDLE...AND THIS AREA IS BEING MONITORED
FOR SEVERE POTENTIAL AND A POSSIBLE WW.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES.  EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 50
KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.  MEAN STORM
MOTION VECTOR 28035.


...WEISS

351,0931 341,0895 325,0901 334,0934

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 29, 10:15 AM CDTSevere Thunderstorm WatchSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 28 more5 hr
Apr 28, 8:00 PM CDTSevere Thunderstorm WatchSPCTishomingo4 hr
Apr 29, 12:00 AM CDTSevere Thunderstorm WatchSPCAttala, Carroll, Choctaw, Clay, Holmes, Humphreys and 19 more4 hr
Apr 29, 3:30 PM CDTSevere Thunderstorm WatchSPCAttala, Clarke, Covington, Greene, Hinds, Holmes and 15 more5 hr

Nearby

Severe Thunderstorm Watches in Arkansas, 2002Severe Thunderstorm Watches in Mississippi, 2002Every severe thunderstorm watch in 2002

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.