Alert archive / Texas / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 191, NWS Houston/Galveston, TX

September 9, 1997Trinity County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at Sep 9, 1997, 5:13 PM CDT for Trinity County, Texas. It was in force for 62 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
Sep 9, 1997, 5:13 PM CDT (22:13 UTC)
Expired
Sep 9, 1997, 6:15 PM CDT
In force
62 min
Issued by
NWS Houston/Galveston, TX
Area
Whole counties

County Trinity County, TX

The radar

The Houston radar (KHGX), 180 km from the middle of the area, began a volume at 22:17 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, 10.2 hours before the alert went out and 203 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 1997-09-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1930 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 1997-09-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 131 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
1930 J/kg
Mixed-layer CIN
-111 J/kg
Mixed-layer LCL
1086 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
131 m²/s²
0-3 km storm-relative helicity
168 m²/s²
Significant tornado parameter
0.7
Supercell composite
2.7

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

IssuedProductOfficeCountiesLasted
Sep 9, 4:10 PM CDTSevere Thunderstorm WarningHGXGrimes65 min
Sep 9, 4:34 PM CDTSevere Thunderstorm WarningHGXPolk41 min
Sep 9, 5:36 PM CDTSevere Thunderstorm WarningHGXLiberty, Montgomery69 min
Sep 9, 5:37 PM CDTSevere Thunderstorm WarningHGXPolk68 min
Sep 9, 5:51 PM CDTSevere Thunderstorm WarningHGXChambers69 min
Sep 9, 5:53 PM CDTSevere Thunderstorm WarningHGXHarris67 min
Sep 9, 6:25 PM CDTSevere Thunderstorm WarningHGXTrinity65 min
Sep 9, 6:58 PM CDTSevere Thunderstorm WarningHGXGalveston, Harris62 min

Nearby

Severe Thunderstorm Warnings in Texas, 1997Every severe thunderstorm warning in 1997

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.