Alert archive / Texas / Tornado Warnings in 1999

Tornado Warning 36, NWS Fort Worth, TX

June 1, 1999Grayson County, Texas

NWS Fort Worth, TX issued this tornado warning at Jun 1, 1999, 6:56 PM CDT for Grayson County, Texas. It was in force for 49 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
Jun 1, 1999, 6:56 PM CDT (23:56 UTC)
Expired
Jun 1, 1999, 7:45 PM CDT
In force
49 min
Issued by
NWS Fort Worth, TX
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Grayson County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 136 km from the middle of the area, began a volume at 23:54 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.

The watch it was issued in

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

IssuedProductOfficeLasted
Jun 1, 5:00 PM CDTTornado WatchSPC5 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 11.9 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-pSkew-T log-p diagram, Fort Worth, TX at 12:00Z on 1999-06-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2199 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 1999-06-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 197 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
2199 J/kg
Mixed-layer CIN
-300 J/kg
Mixed-layer LCL
804 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
197 m²/s²
0-3 km storm-relative helicity
183 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 
TTAA00 KFWD 012357 RRA
TORFTW
TXC181-020045-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE FORT WORTH TX
656 PM CDT TUE JUN 1 1999

THE NATIONAL WEATHER SERVICE IN FORT WORTH HAS REISSUED A

* TORNADO WARNING FOR...
  GRAYSON COUNTY IN NORTH CENTRAL TEXAS...

* UNTIL 745 PM CDT...

* AT 656 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED A
  THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 9 MILES NORTHWEST OF
  SHERMAN...MOVING NORTHEAST AT 40 MPH.

* THE TORNADO WILL BE NEAR...
  DENISON AROUND 710 PM...

CARS ARE EASILY TOSSED AROUND AND CRUSHED BY TORNADO WINDS. DO NOT
LEAVE SHELTER TO USE YOUR CAR TO OUTRUN A TORNADO.

LAT...LON 3372 9679 3355 9682 3358 9638 3378 9648

v

The office that day

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

IssuedProductOfficeCountiesLasted
May 31, 9:52 PM CDTSevere Thunderstorm WarningFWDYoung38 min
Jun 1, 5:12 PM CDTSevere Thunderstorm WarningFWDWise48 min
Jun 1, 5:13 PM CDTSevere Thunderstorm WarningFWDPalo Pinto47 min
Jun 1, 5:20 PM CDTSevere Thunderstorm WarningFWDParker40 min
Jun 1, 5:40 PM CDTTornado WarningFWDPalo Pinto, Parker35 min
Jun 1, 5:52 PM CDTTornado WarningFWDWise23 min
Jun 1, 6:05 PM CDTSevere Thunderstorm WarningFWDDenton55 min
Jun 1, 6:10 PM CDTSevere Thunderstorm WarningFWDTarrant65 min
Jun 1, 6:15 PM CDTSevere Thunderstorm WarningFWDParker60 min
Jun 1, 6:17 PM CDTSevere Thunderstorm WarningFWDWise58 min
Jun 1, 6:19 PM CDTSevere Thunderstorm WarningFWDCooke41 min
Jun 1, 6:24 PM CDTTornado WarningFWDParker51 min
Jun 1, 6:27 PM CDTTornado WarningFWDErath, Palo Pinto48 min
Jun 1, 6:27 PM CDTTornado WarningFWDCooke, Grayson33 min
Jun 1, 6:31 PM CDTTornado WarningFWDWise29 min
Jun 1, 6:42 PM CDTTornado WarningFWDTarrant33 min
Jun 1, 6:53 PM CDTTornado WarningFWDDenton, Wise67 min

Nearby

Tornado Warnings in Texas, 1999Every tornado warning in 1999Tornadoes in 1999

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.