Alert archive / Texas / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 271, NWS Shreveport, LA

May 17, 1999Angelina County, Texas

NWS Shreveport, LA issued this severe thunderstorm warning at May 17, 1999, 8:23 PM CDT for Angelina County, Texas. It was in force for 62 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
May 17, 1999, 8:23 PM CDT (01:23 UTC)
Expired
May 17, 1999, 9:25 PM CDT
In force
62 min
Issued by
NWS Shreveport, LA
Area
Whole counties

County Angelina County, TX

What was reported inside it

TimeReportWhereRemark
May 17, 8:55 PM CDTThunderstorm Wind 60Pollok, TXNumerous trees and powerlines down.
May 17, 9:10 PM CDTHail 0.75Diboll, TX

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The watch it was issued in

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

IssuedProductOfficeLasted
May 17, 7:00 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 1.4 hours before the alert went out and 307 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 1999-05-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 455 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 1999-05-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -31 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
455 J/kg
Mixed-layer CIN
-173 J/kg
Mixed-layer LCL
1233 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
-31 m²/s²
0-3 km storm-relative helicity
157 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

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, 7:02 PM CDTSevere Thunderstorm WarningSHVCherokee, Rusk58 min
May 17, 7:54 PM CDTSevere Thunderstorm WarningSHVCherokee, Nacogdoches61 min
May 17, 7:57 PM CDTSevere Thunderstorm WarningSHVPanola63 min
May 17, 8:04 PM CDTSevere Thunderstorm WarningSHVShelby61 min
May 17, 8:41 PM CDTSevere Thunderstorm WarningSHVSabine, San Augustine64 min
May 17, 7:03 PM CDTSevere Thunderstorm WarningSHVCaddo42 min
May 17, 8:38 PM CDTSevere Thunderstorm WarningSHVBossier, Caddo47 min
May 17, 9:06 PM CDTSevere Thunderstorm WarningSHVSabine64 min
May 17, 9:44 PM CDTSevere Thunderstorm WarningSHVLincoln41 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.