Alert archive / Texas / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 75

April 7, 200242 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at Apr 7, 2002, 8:00 PM CDT for 42 counties in Texas. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Apr 7, 2002, 8:00 PM CDT (01:00 UTC)
Expired
Apr 8, 2002, 1:00 AM CDT
In force
5 hr
Issued by
the Storm Prediction Center
All 42 counties

Atascosa County, TX, Bastrop County, TX, Bell County, TX, Burleson County, TX, Caldwell County, TX, Collin County, TX, Comal County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, DeWitt County, TX, Ellis County, TX, Falls County, TX, Fannin County, TX, Fayette County, TX, Freestone County, TX, Gonzales County, TX, Grayson County, TX, Guadalupe County, TX, Hays County, TX, Henderson County, TX, Hill County, TX, Hopkins County, TX, Hunt County, TX, Johnson County, TX, Karnes County, TX, Kaufman County, TX, Lamar County, TX, Lavaca County, TX, Lee County, TX, Limestone County, TX, McLennan County, TX, Milam County, TX, Navarro County, TX, Rains County, TX, Robertson County, TX, Rockwall County, TX, Tarrant County, TX, Travis County, TX, Van Zandt County, TX, Williamson County, TX, Wilson County, TX

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 7, 8:10 PM CDTFlash Flood WarningFWDDallas2 hr
Apr 7, 8:16 PM CDTSevere Thunderstorm WarningFWDBell59 min
Apr 7, 8:29 PM CDTSevere Thunderstorm WarningEWXHays46 min
Apr 7, 8:36 PM CDTSevere Thunderstorm WarningEWXComal24 min
Apr 7, 8:40 PM CDTTornado WarningEWXAtascosa65 min
Apr 7, 9:01 PM CDTSevere Thunderstorm WarningFWDFalls44 min
Apr 7, 9:18 PM CDTTornado WarningEWXWilson57 min
Apr 7, 9:38 PM CDTSevere Thunderstorm WarningFWDMilam67 min
Apr 7, 10:09 PM CDTSevere Thunderstorm WarningFWDRobertson51 min
Apr 7, 10:15 PM CDTSevere Thunderstorm WarningEWXWilson60 min
Apr 7, 10:43 PM CDTSevere Thunderstorm WarningHGXBrazos, Burleson62 min
Apr 7, 10:55 PM CDTSevere Thunderstorm WarningEWXGonzales65 min
Apr 7, 11:07 PM CDTFlash Flood WarningEWXAtascosa6 hr
Apr 7, 11:25 PM CDTFlash Flood WarningEWXWilson6 hr
Apr 7, 11:37 PM CDTSevere Thunderstorm WarningEWXAtascosa38 min
Apr 8, 12:06 AM CDTSevere Thunderstorm WarningEWXWilson54 min
Apr 8, 12:13 AM CDTTornado WarningEWXAtascosa62 min
Apr 8, 1:00 AM CDTSevere Thunderstorm WarningEWXWilson45 min

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 1.0 hours before the alert went out and 220 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, Fort Worth, TX at 00:00Z on 2002-04-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1917 joules per kilogram.LCLEL10008507005003002001001 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, Fort Worth, TX at 00:00Z on 2002-04-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 257 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
1917 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
493 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
257 m²/s²
0-3 km storm-relative helicity
271 m²/s²
Significant tornado parameter
3.2
Supercell composite
11.5

Open this sounding in Storm Lab

The text

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

000 
WWUS20 KWNS 080036
SEL5  
SPC WW 080032
TXZ000-080600-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 75
STORM PREDICTION CENTER NORMAN OK
732 PM CDT SUN APR 7 2002

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

   CENTRAL AND EASTERN TEXAS                              

EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 800 PM UNTIL
100 AM 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 50 STATUTE MILES
EAST AND WEST OF A LINE FROM 50 MILES WEST OF VICTORIA TEXAS TO 40
MILES WEST NORTHWEST OF PARIS TEXAS.

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 73...WW 74...

DISCUSSION...LINE OF STRONG/SEVERE STORMS CONTINUES TO TRACK
EASTWARD ACROSS CENTRAL TX.  STORMS HAVE EVOLVED INTO A LINEAR
CONVECTIVE SYSTEM...WITH THE GREATEST THREAT NOW BEING DAMAGING
WINDS AND LARGE HAIL.  ISOLATED STORMS MAY MAINTAIN INTENSITY INTO
EARLY MORNING HOURS.

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 500.  MEAN STORM
MOTION VECTOR 27040.

...HART

285,0983 335,0965 335,0951 285,0965

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 7, 11:00 PM CDTSevere Thunderstorm WatchSPCAngelina, Austin, Brazoria, Brazos, Colorado, Fort Bend and 14 more4 hr
Apr 8, 1:00 AM CDTSevere Thunderstorm WatchSPCAransas, Atascosa, Bee, Bexar, DeWitt, Frio and 12 more4 hr
Apr 8, 1:15 AM CDTSevere Thunderstorm WatchSPCChambers, Hardin, Jasper, Jefferson, Liberty, Newton and 4 more5 hr
Apr 8, 3:00 AM CDTSevere Thunderstorm WatchSPCAustin, Brazoria, Calhoun, Colorado, Fort Bend, Galveston and 7 more5 hr

Nearby

Severe Thunderstorm Watches in Texas, 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.