Alert archive / Texas / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 264, NWS Shreveport, LA

May 17, 1999Cass County, Texas

NWS Shreveport, LA issued this severe thunderstorm warning at May 17, 1999, 6:43 PM CDT for Cass County, Texas. It was in force for 47 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
May 17, 1999, 6:43 PM CDT (23:43 UTC)
Expired
May 17, 1999, 7:30 PM CDT
In force
47 min
Issued by
NWS Shreveport, LA
Area
Whole counties

County Cass County, TX

The watch it was issued in

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

IssuedProductOfficeLasted
May 17, 3:30 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 11.7 hours before the alert went out and 276 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 1999-05-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1514 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 1999-05-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 291 square meters per square second.19395878Sfc1 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
1514 J/kg
Mixed-layer CIN
-170 J/kg
Mixed-layer LCL
643 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
291 m²/s²
0-3 km storm-relative helicity
346 m²/s²
Significant tornado parameter
0.5
Supercell composite
5.7

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

The office that day

Everything else NWS Shreveport, LA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 17, 2:57 PM CDTSevere Thunderstorm WarningSHVRed River63 min
May 17, 3:44 PM CDTSevere Thunderstorm WarningSHVFranklin51 min
May 17, 4:40 PM CDTFlash Flood WarningSHVFranklin, Titus4 hr
May 17, 4:48 PM CDTSevere Thunderstorm WarningSHVWood32 min
May 17, 6:18 PM CDTSevere Thunderstorm WarningSHVWood62 min
May 17, 6:26 PM CDTSevere Thunderstorm WarningSHVSmith59 min
May 17, 6:56 PM CDTSevere Thunderstorm WarningSHVGregg, Upshur64 min

Nearby

Severe Thunderstorm Warnings in Texas, 1999Every severe thunderstorm warning 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.