Alert archive / Texas / Tornado Watches in 2002

Tornado Watch 90

April 13, 200219 counties in Texas

The Storm Prediction Center issued this tornado watch at Apr 13, 2002, 5:00 AM CDT for 19 counties in Texas. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Apr 13, 2002, 5:00 AM CDT (10:00 UTC)
Expired
Apr 13, 2002, 10:00 AM CDT
In force
5 hr
Issued by
the Storm Prediction Center

Counties Armstrong County, TX, Briscoe County, TX, Carson County, TX, Castro County, TX, Childress County, TX, Collingsworth County, TX, Cottle County, TX, Deaf Smith County, TX, Donley County, TX, Gray County, TX, Hall County, TX, Hartley County, TX, Motley County, TX, Oldham County, TX, Parmer County, TX, Potter County, TX, Randall County, TX, Swisher County, TX, Wheeler County, TX

The radar

The Amarillo radar (KAMA), 12 km from the middle of the area, began a volume at 10:02 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

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

IssuedProductOfficeCountiesLasted
Apr 13, 5:06 AM CDTSevere Thunderstorm WarningAMADeaf Smith44 min
Apr 13, 6:54 AM CDTSevere Thunderstorm WarningLUBSwisher51 min

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 00:00Z, 10.0 hours before the alert went out and 13 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, Amarillo Airport, TX at 00:00Z on 2002-04-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 880 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Amarillo Airport, TX at 00:00Z on 2002-04-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 14 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
880 J/kg
Mixed-layer CIN
-12 J/kg
Mixed-layer LCL
1630 m above ground
0-6 km bulk shear
69 kt
0-1 km storm-relative helicity
14 m²/s²
0-3 km storm-relative helicity
-51 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 130943
SEL0  
SPC WW 130939
TXZ000-131500-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 90
STORM PREDICTION CENTER NORMAN OK
439 AM CDT SAT APR 13 2002

THE STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

   THE TEXAS PANHANDLE                              

EFFECTIVE THIS SATURDAY MORNING FROM 500 AM UNTIL 1000 AM CDT.

TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 55 STATUTE MILES NORTH AND
SOUTH OF A LINE FROM 75 MILES WEST OF AMARILLO TEXAS TO 25 MILES
NORTHEAST OF CHILDRESS TEXAS.

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND 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.

OTHER WATCH INFORMATION...THIS TORNADO WATCH REPLACES TORNADO WATCH
NUMBER 88.  WATCH NUMBER 88 WILL NOT BE IN EFFECT AFTER 500 AM CDT. 
CONTINUE...WW 89...

DISCUSSION...SEVERAL INTENSE/SUPERCELL THUNDERSTORMS OVER THE TX
PANHANDLE ARE EXPECTED TO CONTINUE TO TRACK EAST-SOUTHEASTWARD
THROUGH THE MID MORNING HOURS.  LARGE HAIL AND DAMAGING WINDS WILL
REMAIN THE MAIN THREAT.  HOWEVER...STRONG VERTICAL SHEAR PROFILES
AND SUFFICIENT SURFACE-BASED INSTABILITY ALSO INDICATE THE
POTENTIAL FOR ISOLATED TORNADOES IN STRONGER CELLS.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES.  EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. 
MEAN STORM MOTION VECTOR 28030.

...HART

360,1030 352,0995 335,0995 342,1030

WWUS20 KWNS 130943
SEL0  
SPC WW 130939
TXZ000-131500-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 90
STORM PREDICTION CENTER NORMAN OK
439 AM CDT SAT APR 13 2002

THE STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

   THE TEXAS PANHANDLE                              

EFFECTIVE THIS SATURDAY MORNING FROM 500 AM UNTIL 1000 AM CDT.

TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 55 STATUTE MILES NORTH AND
SOUTH OF A LINE FROM 75 MILES WEST OF AMARILLO TEXAS TO 25 MILES
NORTHEAST OF CHILDRESS TEXAS.

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND 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.

OTHER WATCH INFORMATION...THIS TORNADO WATCH REPLACES TORNADO WATCH
NUMBER 88.  WATCH NUMBER 88 WILL NOT BE IN EFFECT AFTER 500 AM CDT. 
CONTINUE...WW 89...

DISCUSSION...SEVERAL INTENSE/SUPERCELL THUNDERSTORMS OVER THE TX
PANHANDLE ARE EXPECTED TO CONTINUE TO TRACK EAST-SOUTHEASTWARD
THROUGH THE MID MORNING HOURS.  LARGE HAIL AND DAMAGING WINDS WILL
REMAIN THE MAIN THREAT.  HOWEVER...STRONG VERTICAL SHEAR PROFILES
AND SUFFICIENT SURFACE-BASED INSTABILITY ALSO INDICATE THE
POTENTIAL FOR ISOLATED TORNADOES IN STRONGER CELLS.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES.  EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. 
MEAN STORM MOTION VECTOR 28030.

...HART

360,1030 352,0995 335,0995 342,1030

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 12, 7:45 PM CDTSevere Thunderstorm WatchSPCArmstrong, Carson, Collingsworth, Dallam, Deaf Smith, Donley and 14 more6 hr
Apr 12, 11:30 PM CDTTornado WatchSPCArmstrong, Briscoe, Carson, Childress, Collingsworth, Donley and 17 more6 hr
Apr 13, 4:45 AM CDTSevere Thunderstorm WatchSPCArcher, Baylor, Foard, Hardeman, Knox, Wichita and 1 more5 hr
Apr 13, 10:45 AM CDTSevere Thunderstorm WatchSPCCollin, Cooke, Dallas, Delta, Denton, Fannin and 11 more5 hr
Apr 13, 3:45 PM CDTSevere Thunderstorm WatchSPCBailey, Briscoe, Childress, Cochran, Cottle, Crosby and 16 more5 hr

Nearby

Tornado Watches in Texas, 2002Every tornado 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.