Alert archive / Texas / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 607

August 13, 20026 counties in Oklahoma; 23 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at Aug 13, 2002, 8:55 PM CDT for 6 counties in Oklahoma; 23 counties in Texas. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Aug 13, 2002, 8:55 PM CDT (01:55 UTC)
Expired: Aug 14, 2002, 2:00 AM CDT
In force: 5 hr
Issued by: the Storm Prediction Center

All 29 counties

Bryan County, OK, Choctaw County, OK, Jefferson County, OK, Love County, OK, Marshall County, OK, McCurtain County, OK, Archer County, TX, Baylor County, TX, Clay County, TX, Collin County, TX, Cooke County, TX, Delta County, TX, Denton County, TX, Fannin County, TX, Franklin County, TX, Grayson County, TX, Haskell County, TX, Hopkins County, TX, Jack County, TX, Knox County, TX, Lamar County, TX, Montague County, TX, Red River County, TX, Throckmorton County, TX, Titus County, TX, Wichita County, TX, Wilbarger County, TX, Wise County, TX, Young County, TX

The radar

The Altus AFB radar (KFDR), 132 km from the middle of the area, began a volume at 01:57 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

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

Issued	Product	Office	Counties	Lasted
Aug 13, 9:23 PM CDT	Severe Thunderstorm Warning	SJT	Haskell	67 min
Aug 13, 10:31 PM CDT	Severe Thunderstorm Warning	SJT	Haskell	59 min
Aug 13, 11:13 PM CDT	Severe Thunderstorm Warning	FWD	Grayson	62 min
Aug 14, 12:02 AM CDT	Severe Thunderstorm Warning	FWD	Cooke	28 min
Aug 14, 12:23 AM CDT	Severe Thunderstorm Warning	OUN	Marshall	22 min
Aug 14, 12:45 AM CDT	Severe Thunderstorm Warning	OUN	Bryan, Marshall	45 min
Aug 14, 1:14 AM CDT	Flash Flood Warning	OUN	Atoka, Bryan	3 hr
Aug 14, 1:42 AM CDT	Severe Thunderstorm Warning	FWD	Fannin, Lamar	48 min

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 1.9 hours before the alert went out and 111 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2727 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 1677 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 0 m²/s²
0-3 km storm-relative helicity: 57 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.7

Open this sounding in Storm Lab

The text

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

000 
WWUS20 KWNS 140156
SEL7  
SPC WW 140155
OKZ000-TXZ000-140700-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 607
STORM PREDICTION CENTER NORMAN OK
855 PM CDT TUE AUG 13 2002

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

   SOUTHERN OKLAHOMA                           
   NORTH TEXAS                              

EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 855 PM
UNTIL 200 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 40 STATUTE MILES
NORTH AND SOUTH OF A LINE FROM 80 MILES WEST SOUTHWEST OF WICHITA
FALLS TEXAS TO 45 MILES EAST NORTHEAST 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...THIS SEVERE THUNDERSTORM WATCH REPLACES
SEVERE THUNDERSTORM WATCH NUMBER 604...SEVERE THUNDERSTORM WATCH
NUMBER 605.  WATCH NUMBER 604...605 WILL NOT BE IN EFFECT AFTER 855
PM CDT.  CONTINUE...WW 606...

DISCUSSION...ISOLATED STRONG/SEVERE STORMS WILL REMAIN POSSIBLE IN
VICINITY OF SURFACE BOUNDARY NEAR THE RED RIVER.  VERY UNSTABLE
AIRMASS SOUTH OF BOUNDARY AND SLOWLY INCREASING VERTICAL SHEAR
PROFILES WILL SUPPORT THREAT OF ISOLATED SUPERCELLS/BOWS WITH
DAMAGING WINDS AND LARGE HAIL.

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 28025.

...HART

340,0994 342,0944 331,0944 325,0994

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 13, 7:15 PM CDT	Severe Thunderstorm Watch	SPC	Brown, Coke, Coleman, Concho, Irion, McCulloch and 4 more	6 hr

Nearby

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