Alert archive / Texas / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 137, NWS Shreveport, LA

March 31, 1998Nacogdoches County, Texas

NWS Shreveport, LA issued this severe thunderstorm warning at Mar 31, 1998, 12:09 AM CST for Nacogdoches County, Texas. It was in force for 66 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
Mar 31, 1998, 12:09 AM CST (06:09 UTC)
Expired
Mar 31, 1998, 1:15 AM CST
In force
66 min
Issued by
NWS Shreveport, LA
Area
Whole counties

County Nacogdoches County, TX

The watch it was issued in

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

IssuedProductOfficeLasted
Mar 31, 12:00 AM CSTTornado WatchSPC4 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 6.2 hours before the alert went out and 126 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, Shreveport, LA at 00:00Z on 1998-03-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 812 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, Shreveport, LA at 00:00Z on 1998-03-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 131 square meters per square second.1939587897117Sfc1 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
812 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
1286 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
131 m²/s²
0-3 km storm-relative helicity
229 m²/s²
Significant tornado parameter
0.7
Supercell composite
4.4

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
Mar 30, 10:39 PM CSTSevere Thunderstorm WarningSHVWood31 min
Mar 30, 10:59 PM CSTSevere Thunderstorm WarningSHVSmith61 min
Mar 30, 11:09 PM CSTSevere Thunderstorm WarningSHVCherokee61 min
Mar 30, 11:18 PM CSTSevere Thunderstorm WarningSHVCass62 min
Mar 30, 11:52 PM CSTSevere Thunderstorm WarningSHVGregg, Rusk63 min
Mar 31, 12:03 AM CSTSevere Thunderstorm WarningSHVHarrison, Panola62 min
Mar 31, 12:58 AM CSTSevere Thunderstorm WarningSHVBossier, Caddo62 min
Mar 31, 2:03 AM CSTSevere Thunderstorm WarningSHVWebster32 min
Mar 31, 12:08 AM CSTSevere Thunderstorm WarningSHVMiller62 min

Nearby

Severe Thunderstorm Warnings in Texas, 1998Every severe thunderstorm warning 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.