Alert archive / Texas / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 487, NWS Fort Worth, TX

December 21, 1990Anderson County, Henderson County, Texas

NWS Fort Worth, TX issued this severe thunderstorm warning at Dec 21, 1990, 7:57 AM CST for Anderson County, Henderson County, Texas. It was in force for 48 min.

The area

The counties it named.

The facts

Issued
Dec 21, 1990, 7:57 AM CST (13:57 UTC)
Expired
Dec 21, 1990, 8:45 AM CST
In force
48 min
Issued by
NWS Fort Worth, TX
Area
Whole counties

Counties Anderson County, TX, Henderson County, TX

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Longview/Gregg, TX (KGGG), launched 12:00Z, 2.0 hours before the alert went out and 115 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, Longview/Gregg, TX at 12:00Z on 1990-12-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1707 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, Longview/Gregg, TX at 12:00Z on 1990-12-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 280 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
1707 J/kg
Mixed-layer CIN
-26 J/kg
Mixed-layer LCL
742 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
280 m²/s²
0-3 km storm-relative helicity
252 m²/s²
Significant tornado parameter
2.6
Supercell composite
10.6

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 Fort Worth, TX issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Dec 20, 10:47 PM CSTSevere Thunderstorm WarningFWDRed River58 min
Dec 21, 7:30 AM CSTSevere Thunderstorm WarningFWDFreestone30 min
Dec 21, 8:19 AM CSTSevere Thunderstorm WarningFWDSmith41 min
Dec 21, 8:34 AM CSTSevere Thunderstorm WarningFWDUpshur41 min

Nearby

Severe Thunderstorm Warnings in Texas, 1990Every severe thunderstorm warning in 1990

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.