Alert archive / Louisiana / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 252, NWS Shreveport, LA

November 19, 1991Madison Parish, Tensas Parish, Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at Nov 19, 1991, 7:28 PM CST for Madison Parish, Tensas Parish, Louisiana. It was in force for 2 hr. 3 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Nov 19, 1991, 7:28 PM CST (01:28 UTC)
Expired
Nov 19, 1991, 9:30 PM CST
In force
2 hr
Issued by
NWS Shreveport, LA
Area
Whole counties

Counties Madison Parish, LA, Tensas Parish, LA

What was reported inside it

TimeReportWhereRemark
Nov 19, 7:40 PM CSTTornado F1Madison, LA
Nov 19, 7:58 PM CSTThunderstorm Wind 58Tensas, LA
Nov 19, 8:00 PM CSTThunderstorm Wind 0Tensas, LA

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Jackson, MS (KJAN), launched 00:00Z, 1.5 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, Jackson, MS at 00:00Z on 1991-11-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 898 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, Jackson, MS at 00:00Z on 1991-11-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 116 square meters per square second.193958Sfc1 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
898 J/kg
Mixed-layer CIN
-6 J/kg
Mixed-layer LCL
918 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
116 m²/s²
0-3 km storm-relative helicity
168 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.0

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
Nov 19, 7:28 PM CSTSevere Thunderstorm WarningSHVCaldwell, Franklin, Richland2 hr
Nov 19, 7:28 PM CSTSevere Thunderstorm WarningSHVEast Carroll, West Carroll2 hr

Nearby

Severe Thunderstorm Warnings in Louisiana, 1991Every severe thunderstorm warning in 1991

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.