Alert archive / Texas / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 92

April 13, 200210 counties in Oklahoma; 17 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at Apr 13, 2002, 10:45 AM CDT for 10 counties in Oklahoma; 17 counties in Texas. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Apr 13, 2002, 10:45 AM CDT (15:45 UTC)
Expired
Apr 13, 2002, 4:00 PM CDT
In force
5 hr
Issued by
the Storm Prediction Center
All 27 counties

Atoka County, OK, Bryan County, OK, Carter County, OK, Choctaw County, OK, Johnston County, OK, Love County, OK, Marshall County, OK, McCurtain County, OK, Murray County, OK, Pushmataha County, OK, Collin County, TX, Cooke County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Fannin County, TX, Grayson County, TX, Hunt County, TX, Jack County, TX, Lamar County, TX, Montague County, TX, Palo Pinto County, TX, Parker County, TX, Rockwall County, TX, Stephens County, TX, Tarrant County, TX, Wise County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 89 km from the middle of the area, began a volume at 15:44 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 13, 10:54 AM CDTSevere Thunderstorm WarningFWDCooke66 min
Apr 13, 10:57 AM CDTSevere Thunderstorm WarningFWDJack63 min
Apr 13, 11:20 AM CDTSevere Thunderstorm WarningFWDWise55 min

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 3.8 hours before the alert went out and 61 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 12:00Z on 2002-04-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 592 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, Fort Worth, TX at 12:00Z on 2002-04-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -17 square meters per square second.193958Sfc1 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
592 J/kg
Mixed-layer CIN
-143 J/kg
Mixed-layer LCL
815 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
-17 m²/s²
0-3 km storm-relative helicity
10 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.9

Open this sounding in Storm Lab

The text

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

000 
WWUS20 KWNS 131540
SEL2  
SPC WW 131536
OKZ000-TXZ000-132100-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 92
STORM PREDICTION CENTER NORMAN OK
1036 AM CDT SAT APR 13 2002

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

   SOUTHERN OKLAHOMA                           
   NORTH TEXAS                              

EFFECTIVE THIS SATURDAY MORNING AND AFTERNOON FROM 1045 AM UNTIL
400 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 85 STATUTE MILES
EAST AND WEST OF A LINE FROM 20 MILES SOUTHEAST OF MINERAL WELLS
TEXAS TO 60 MILES NORTHEAST OF DURANT OKLAHOMA.

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 91.  WATCH NUMBER 91 WILL NOT BE
IN EFFECT AFTER 1045 AM CDT.

DISCUSSION...SEVERE MCS CONTINUES TO MOVE EWD ACROSS SRN OK INTO
NRN TX.  SQUALL LINE DRIVEN BY DEEP COLD POOL NOTED ON VAD WINDS
FROM FREDERICK WSR-88D SUPPORTS CONTINUED E/SE MOVEMENT INTO
MODERATELY UNSTABLE AIRMASS.  PRIMARY THREAT WILL BE DAMAGING WINDS
WITH SQUALL LINE.


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 26035.


...HALES

343,0940 323,0962 323,0991 343,0970

WWUS20 KWNS 131540
SEL2  
SPC WW 131536
OKZ000-TXZ000-132100-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 92
STORM PREDICTION CENTER NORMAN OK
1036 AM CDT SAT APR 13 2002

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

   SOUTHERN OKLAHOMA                           
   NORTH TEXAS                              

EFFECTIVE THIS SATURDAY MORNING AND AFTERNOON FROM 1045 AM UNTIL
400 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 85 STATUTE MILES
EAST AND WEST OF A LINE FROM 20 MILES SOUTHEAST OF MINERAL WELLS
TEXAS TO 60 MILES NORTHEAST OF DURANT OKLAHOMA.

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 91.  WATCH NUMBER 91 WILL NOT BE
IN EFFECT AFTER 1045 AM CDT.

DISCUSSION...SEVERE MCS CONTINUES TO MOVE EWD ACROSS SRN OK INTO
NRN TX.  SQUALL LINE DRIVEN BY DEEP COLD POOL NOTED ON VAD WINDS
FROM FREDERICK WSR-88D SUPPORTS CONTINUED E/SE MOVEMENT INTO
MODERATELY UNSTABLE AIRMASS.  PRIMARY THREAT WILL BE DAMAGING WINDS
WITH SQUALL LINE.


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 26035.


...HALES

343,0940 323,0962 323,0991 343,0970

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 12, 7:45 PM CDTSevere Thunderstorm WatchSPCBeaver, Cimarron, Texas6 hr
Apr 12, 11:30 PM CDTTornado WatchSPCBeckham, Greer, Harmon, Roger Mills, Texas6 hr
Apr 13, 4:45 AM CDTSevere Thunderstorm WatchSPCBeckham, Blaine, Comanche, Custer, Dewey, Greer and 6 more5 hr
Apr 13, 7:45 AM CDTSevere Thunderstorm WatchSPCBryan, Caddo, Canadian, Carter, Cleveland, Coal and 16 more5 hr
Apr 13, 5:00 AM CDTTornado WatchSPCArmstrong, Briscoe, Carson, Castro, Childress, Collingsworth and 13 more5 hr
Apr 13, 3:45 PM CDTSevere Thunderstorm WatchSPCBailey, Briscoe, Childress, Cochran, Cottle, Crosby and 16 more5 hr

Nearby

Severe Thunderstorm Watches in Texas, 2002Severe Thunderstorm Watches in Oklahoma, 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.