Alert archive / Texas / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 101, NWS Houston/Galveston, TX

April 27, 1998Walker County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at Apr 27, 1998, 6:47 PM CDT for Walker County, Texas. It was in force for 33 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
Apr 27, 1998, 6:47 PM CDT (23:47 UTC)
Expired
Apr 27, 1998, 7:20 PM CDT
In force
33 min
Issued by
NWS Houston/Galveston, TX
Area
Whole counties

County Walker County, TX

The radar

The Houston radar (KHGX), 149 km from the middle of the area, began a volume at 23:48 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 nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 11.8 hours before the alert went out and 259 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 12:00Z on 1998-04-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 935 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 12:00Z on 1998-04-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 197 square meters per square second.1939587897Sfc1 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
935 J/kg
Mixed-layer CIN
-13 J/kg
Mixed-layer LCL
532 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
197 m²/s²
0-3 km storm-relative helicity
225 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.8

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 Houston/Galveston, TX issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 27, 3:29 PM CDTSevere Thunderstorm WarningHGXMontgomery46 min
Apr 27, 5:24 PM CDTSevere Thunderstorm WarningHGXTrinity61 min
Apr 27, 5:29 PM CDTSevere Thunderstorm WarningHGXAustin, Washington66 min
Apr 27, 5:38 PM CDTSevere Thunderstorm WarningHGXBurleson62 min
Apr 27, 5:41 PM CDTSevere Thunderstorm WarningHGXWalker64 min
Apr 27, 6:12 PM CDTSevere Thunderstorm WarningHGXGrimes, Waller63 min
Apr 27, 6:15 PM CDTSevere Thunderstorm WarningHGXGrimes35 min
Apr 27, 6:27 PM CDTSevere Thunderstorm WarningHGXTrinity63 min
Apr 27, 6:50 PM CDTSevere Thunderstorm WarningHGXMontgomery65 min
Apr 27, 6:57 PM CDTSevere Thunderstorm WarningHGXTrinity63 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; radar from the NEXRAD Level II archive.