Alert archive / Texas / Tornado Warnings in 1998

Tornado Warning 24, NWS Fort Worth, TX

August 12, 1998Grayson County, Texas

NWS Fort Worth, TX issued this tornado warning at Aug 12, 1998, 8:40 PM CDT for Grayson County, Texas. It was in force for 20 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued
Aug 12, 1998, 8:40 PM CDT (01:40 UTC)
Expired
Aug 12, 1998, 9:00 PM CDT
In force
20 min
Issued by
NWS Fort Worth, TX
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Grayson County, TX

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 1.7 hours before the alert went out and 128 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 1998-08-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 391 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 00:00Z on 1998-08-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 8 square meters per square second.1939Sfc1 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
391 J/kg
Mixed-layer CIN
-44 J/kg
Mixed-layer LCL
2368 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
8 m²/s²
0-3 km storm-relative helicity
35 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 
TTAA00 KFTW 130140 RRA
TORFTW
TXC181-130200-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE FORT WORTH TX
840 PM CDT WED AUG 12 1998

THE NATIONAL WEATHER SERVICE IN FORT WORTH HAS ISSUED A

   * TORNADO WARNING FOR
     GRAYSON COUNTY IN TEXAS
     INCLUDING DENISON

   * UNTIL 900 PM CDT

   * AT 840 PM CDT NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED A
     DEVELOPING TORNADO OVER POTTSBORO...OR ABOUT 7 MILES WEST OF
     DENISON...MOVING SOUTHEAST AT 10 MILES PER HOUR.

   * OTHER LOCATIONS IN THE WARNING INCLUDE POTTSBORO

LAT...LON 3378 9681 3365 9666 3390 9632 3406 9652

What forecasters said that day

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

In the hours before

Local storm report, Aug 12, 8:25 PM CDT, 15 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FORT WORTH TX
725 PM CST WED AUG 12 1998

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

0240 PM    PHALBA                    TX   WIND DAMAGE
08/12/98   VAN ZANDT                      TREES AND POWER LINES DOWN

0315 PM    MARTINS MILLS             TX   WIND DAMAGE
08/12/98   VAN ZANDT                      TREES AND POWER LINES DOWN

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 12, 7:34 PM CDTSevere Thunderstorm WarningFWDHopkins26 min
Aug 13, 3:33 PM CDTSevere Thunderstorm WarningFWDPalo Pinto, Stephens42 min
Aug 13, 3:53 PM CDTSevere Thunderstorm WarningFWDEastland, Erath52 min

Nearby

Tornado Warnings in Texas, 1998Every tornado warning in 1998Tornadoes in 1998

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.