Alert archive / Texas / Severe Thunderstorm Warnings in 2003

Severe Thunderstorm Warning 352, NWS Fort Worth, TX

August 11, 2003Comanche County, Texas

NWS Fort Worth, TX issued this severe thunderstorm warning at Aug 11, 2003, 9:18 PM CDT for Comanche County, Texas. It was in force for 57 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 11, 2003, 9:18 PM CDT (02:18 UTC)
Expired: Aug 11, 2003, 10:15 PM CDT
In force: 57 min
Issued by: NWS Fort Worth, TX
Area: Counties, with a storm outline in the text

County Comanche County, TX

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 11, 4:45 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 2.3 hours before the alert went out and 152 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: 947 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 2393 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: -44 m²/s²
0-3 km storm-relative helicity: 42 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KFWD 120218
SVRFTW
TXC093-120315-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE FORT WORTH TX
918 PM CDT MON AUG 11 2003

THE NATIONAL WEATHER SERVICE IN FORT WORTH HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  COMANCHE COUNTY IN NORTH CENTRAL TEXAS

* UNTIL 1015 PM CDT

* AT 918 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED A
  SEVERE THUNDERSTORM 2 MILES SOUTHWEST OF DE LEON...MOVING SOUTH AT
  40 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  COMANCHE AROUND 925 PM CDT

HAIL TO THE SIZE OF NICKELS AND WIND GUSTS TO 60 MPH ARE LIKELY. FOR
YOUR PROTECTION MOVE TO A STURDY SHELTER UNTIL THE STORM PASSES.

LAT...LON 3199 9837 3225 9858 3207 9888 3175 9868
          3175 9841

$$

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Fort Worth, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 11, 4:16 PM CDT, 5 hours 2 minutes earlier.

Area forecast discussion, Aug 11, 4:16 PM CDT, 5 hours 2 minutes before

AREA FORECAST DISCUSSION...UPDATED TO ADD NUMBERS
NATIONAL WEATHER SERVICE FORT WORTH TX
416 PM CDT MON AUG 11 2003

.DISCUSSION...307 PM CDT
LAPS AND VISIBLE SATELLITE DATA SHOW SURFACE CONVERGENCE...AND
ASSOCIATED SHOWERS AND THUNDERSTORMS...EXTENDING AROUND THE
PERIPHERY OF NORTH TEXAS. AT THE UPPER LEVELS...A VIGOROUS UPPER
FLOW WAS MOVING INTO NORTH TEXAS. ONE AREA OF UPPER TROUGHING WAS
LOCATED OVER SOUTHEAST TEXAS...WHILE ANOTHER COULD BE FOUND MOVING
SOUTH THROUGH EASTERN KANSAS. WITH ALL THIS IN MIND...I HAVE LEFT
SLIGHT CHANCE TO CHANCE POPS ACROSS THE ENTIRE REGION TONIGHT.

TUESDAY THROUGH THURSDAY...THE UPPER RIDGE OVER THE WEST WILL BUILD
ATOP THE UPPER TROUGH IN THE SOUTH...FORCING THE TROUGH TO SLIDE
ACROSS TEXAS AND INTO THE SOUTHWEST. WITH LOW LEVEL EAST TO
NORTHEAST WINDS...THE GFS AND ETA ARE INDICATING SLIGHTLY LOWER
1000-850 THICKNESSES...FOR A TAD BELOW NORMAL HIGH TEMPERATURES.
WITH THE TROUGH NEARBY...AND NEBULOUS CONVECTIVE BOUNDARIES
LIKELY...I AM HARD PRESSED TO FIND A PREFERRED LOCATION AND TIME
FOR CONVECTION. THEREFORE...I HAVE LEFT AT LEAST 20 POPS THROUGH
THURSDAY EVENING.

BY FRIDAY...THE TROUGH IS PROGGED TO SLIDE FAR ENOUGH WEST AS THE
STRONG CENTRAL CONUS RIDGE BUILDS INTO THE SOUTH. WITH THIS IN
MIND...WE MAY BE END THUNDERSTORM CHANCES BY FRIDAY. HOWEVER...AS
THE PREVIOUS FORECAST HAD A SLIGHT CHANCE...I WILL AVOID FLIP
FLOPPING ON THIS MODEL RUN. IN ANY CASE...TEMPERATURES WILL BE BACK
TO THE NORMAL MID TO UPPER 90S BY NEXT WEEKEND.

FCSTID = 30
DFW   71  91  69  90 /  20  20  20  20
ACT   72  92  70  91 /  30  30  20  30
PRX   68  87  66  88 /  30  30  20  30
DTO   69  90  68  88 /  20  20  20  20
TKI   69  88  68  88 /  20  20  20  20
DAL   71  91  70  90 /  20  20  20  20
TRL   70  89  68  89 /  30  30  20  20
CRS   71  91  70  90 /  30  30  20  40
TPL   72  93  70  91 /  30  30  20  30

.FWD...NONE.

Hazardous weather outlook, Aug 11, 3:45 PM CDT, 5 hours 33 minutes before

TXZ091>095-100>107-115>123-129>135-141>148-156>162-174-175-121100-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE FORT WORTH TX
345 PM CDT MON AUG 11 2003

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH TEXAS.

.DAY ONE...

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THROUGH THIS EVENING
EAST OF A BONHAM...KAUFMAN...CAMERON LINE.  NORTHERLY FLOW ALOFT...
COUPLED WITH INCREASING WIND SPEEDS IN THE MID LEVELS OF THE
ATMOSPHERE...WILL RESULT IN SCATTERED THUNDERSTORMS ACROSS NORTH
TEXAS THROUGH TONIGHT. THE MAIN SEVERE WEATHER THREATS WILL BE FROM
WIND GUSTS TO 60 MPH AND HAIL UP TO THE SIZE OF NICKELS.  SCATTERED
THUNDERSTORMS WILL LINGER THROUGH THE EVENING HOURS...HOWEVER THE
SEVERE WEATHER THREAT SHOULD DECREASE AFTER SUNSET.

SCATTERED THUNDERSTORMS ARE ALSO EXPECTED WEST OF A LINE FROM
MINERAL WELLS...MERIDIAN...CAMERON THIS AFTERNOON AND EARLY EVENING.
THESE STORMS SHOULD WEAKEN FAIRLY RAPIDLY AFTER SUNSET.

.DAYS TWO THROUGH SEVEN...
SCATTERED AFTERNOON AND EVENING THUNDERSTORMS WILL BE POSSIBLE
TUESDAY THROUGH SUNDAY AS AN UPPER LEVEL TROUGH MOVES SLOWLY ACROSS
TEXAS AND INTO THE SOUTHWESTERN UNITED STATE. THE SOUTHERN HALF OF
NORTH TEXAS WILL BE THE MOST FAVORED AREA FOR STORM DEVELOPMENT.

.SPOTTER CALL TO ACTION STATEMENT...
LIMITED SPOTTER ACTIVATION MAY BE REQUIRED EAST OF A BONHAM...
KAUFMAN...CAMERON LINE...MAINLY THROUGH SUNSET.

In the hours before

Local storm report, Aug 11, 7:47 PM CDT, 1 hour 31 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FORT WORTH TX
747 PM CDT MON AUG 11 2003

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0724 PM    HALTON CITY               TX   WIND DAMAGE
08/11/03   TARRANT                        NUMEROUS POWER LINES DOWN
                                          ON AIRPORT FREEWAY (HIGH
                                          121).

Local storm report, Aug 11, 7:55 PM CDT, 1 hour 23 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FORT WORTH TX
755 PM CDT MON AUG 11 2003

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0724 PM    HALTOM CITY               TX   WIND DAMAGE
08/11/03   TARRANT                        NUMEROUS POWER LINES DOWN
                                          ON AIRPORT FREEWAY
                                          (STATE HIGHWAY 121)

0743 PM    ARLINGTON                 TX   0.75 INCH HAIL
08/11/03   TARRANT                        REPORTED BY OFF DUTY NWS
                                          EMPLOYEE ONE MILE EAST OF
                                          THE NORTH END OF LAKE
                                          ARLINGTON

0747 PM    DALWORTHINGTON GARDENS    TX   1.75 INCH HAIL
08/11/03   TARRANT                        REPORTED BY SPOTTERS

25

Local storm report, Aug 11, 8:10 PM CDT, 1 hour 8 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FORT WORTH TX
810 PM CDT MON AUG 11 2003

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0800 PM    RENDON                    TX   1.75 INCH HAIL
08/11/03   TARRANT                        GOLFBALL HAIL
                                          REPORTED BY SPOTTER

0800 PM    RENDON                    TX   WIND
08/11/03   TARRANT                        65 MPH WINDS REPORTED BY
                                          SPOTTER

25

Local storm report, Aug 11, 8:40 PM CDT, 38 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FORT WORTH TX
840 PM CDT MON AUG 11 2003

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0828 PM    CLEBURNE                  TX   2.75 INCH HAIL
08/11/03   JOHNSON                        REPORTED BY LAW ENFORCEMENT

Local storm report, Aug 11, 8:42 PM CDT, 36 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FORT WORTH TX
842 PM CDT MON AUG 11 2003

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0645 PM    CORINTH                   TX   WIND DAMAGE
08/11/03   DENTON                         REPORTED BY LAW
                                          ENFORCEMENT. SEVERAL TREES
                                          DOWN AND FENCES BLOWN OVER
                                          IN OAKMONT SUBDIVISION.

BB

Local storm report, Aug 11, 8:45 PM CDT, 33 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FORT WORTH TX
845 PM CDT MON AUG 11 2003

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0831 PM    GORDON                    TX   0.75 INCH HAIL
08/11/03   PALO PINTO                     REPORTED BY EMERGENCY
                                          MANAGEMENT

0831 PM    GORDON                    TX   WIND DAMAGE
08/11/03   PALO PINTO                     TREES AND POWER LINES
                                          DOWNED BY HIGH WINDS OVER
                                          65 MPH. 6 INCH DIAMETER
                                          LIMBS BROKEN. REPORTED BY
                                          EMERGENCY MANAGEMENT

25

The office that day

Everything else NWS Fort Worth, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 11, 7:01 PM CDT	Severe Thunderstorm Warning	FWD	Dallas, Tarrant	59 min
Aug 11, 7:07 PM CDT	Severe Thunderstorm Warning	FWD	Wise	53 min
Aug 11, 7:19 PM CDT	Severe Thunderstorm Warning	FWD	Limestone	26 min
Aug 11, 7:44 PM CDT	Severe Thunderstorm Warning	FWD	Johnson, Tarrant	61 min
Aug 11, 8:19 PM CDT	Severe Thunderstorm Warning	FWD	Palo Pinto	26 min
Aug 11, 8:25 PM CDT	Severe Thunderstorm Warning	FWD	Erath	65 min
Aug 11, 8:29 PM CDT	Severe Thunderstorm Warning	FWD	Hill, Johnson	61 min
Aug 11, 9:34 PM CDT	Severe Thunderstorm Warning	FWD	Hood	41 min
Aug 11, 10:04 PM CDT	Severe Thunderstorm Warning	FWD	Somervell	41 min
Aug 11, 10:31 PM CDT	Severe Thunderstorm Warning	FWD	Comanche, Hamilton	44 min

Nearby

Severe Thunderstorm Warnings in Texas, 2003 Every severe thunderstorm warning in 2003

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.