Alert archive / Louisiana / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 20, NWS Shreveport, LA

February 9, 1990Claiborne Parish, Louisiana; Columbia County, Arkansas

NWS Shreveport, LA issued this severe thunderstorm warning at Feb 9, 1990, 4:43 PM CST for Claiborne Parish, Louisiana; Columbia County, Arkansas. It was in force for 82 min.

The area

The counties it named.

The facts

Issued
Feb 9, 1990, 4:43 PM CST (22:43 UTC)
Expired
Feb 9, 1990, 6:05 PM CST
In force
82 min
Issued by
NWS Shreveport, LA
Area
Whole counties

Counties Columbia County, AR, Claiborne Parish, LA

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, 10.7 hours before the alert went out and 158 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 1990-02-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 891 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 1990-02-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 208 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
891 J/kg
Mixed-layer CIN
-34 J/kg
Mixed-layer LCL
661 m above ground
0-6 km bulk shear
63 kt
0-1 km storm-relative helicity
208 m²/s²
0-3 km storm-relative helicity
202 m²/s²
Significant tornado parameter
1.2
Supercell composite
4.3

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
Feb 9, 4:04 PM CSTSevere Thunderstorm WarningSHVBossier, Webster71 min
Feb 9, 5:12 PM CSTSevere Thunderstorm WarningSHVCaddo, De Soto93 min
Feb 9, 5:12 PM CSTSevere Thunderstorm WarningSHVBossier93 min
Feb 9, 1:04 PM CSTSevere Thunderstorm WarningSHVBowie, Cass56 min
Feb 9, 2:38 PM CSTSevere Thunderstorm WarningSHVGregg, Harrison67 min
Feb 9, 4:43 PM CSTSevere Thunderstorm WarningSHVHarrison, Panola, Rusk, Shelby82 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 1990Severe Thunderstorm Warnings in Arkansas, 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.