Alert archive / Louisiana / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 490, NWS Shreveport, LA

December 9, 20234 parishes in Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at Dec 9, 2023, 4:02 PM CST for 4 parishes in Louisiana. It was in force for 43 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
Dec 9, 2023, 4:02 PM CST (22:02 UTC)
Expired
Dec 9, 2023, 4:45 PM CST
In force
43 min
Issued by
NWS Shreveport, LA
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties De Soto Parish, LA, Natchitoches Parish, LA, Red River Parish, LA, Sabine Parish, LA

The radar

The Shreveport radar (KSHV), 76 km from the middle of the area, began a volume at 22:03 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

Lake Charles Mun, LA (KLCH), launched 12:00Z, 10.0 hours before the alert went out and 195 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, Lake Charles Mun, LA at 12:00Z on 2023-12-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 461 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, Lake Charles Mun, LA at 12:00Z on 2023-12-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 193 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
461 J/kg
Mixed-layer CIN
-90 J/kg
Mixed-layer LCL
803 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
193 m²/s²
0-3 km storm-relative helicity
233 m²/s²
Significant tornado parameter
0.2
Supercell composite
2.1

Open this sounding in Storm Lab

The office that day

Everything else NWS Shreveport, LA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Dec 9, 4:07 PM CSTSpecial Weather StatementSHVSan Augustine38 min
Dec 9, 4:13 PM CSTSevere Thunderstorm WarningSHVAngelina, Nacogdoches, Sabine, San Augustine47 min
Dec 9, 3:38 PM CSTSpecial Weather StatementSHVSabine52 min
Dec 9, 3:42 PM CSTSpecial Weather StatementSHVBienville48 min
Dec 9, 3:47 PM CSTSpecial Weather StatementSHVRed River43 min
Dec 9, 4:39 PM CSTSevere Thunderstorm WarningSHVNatchitoches, Winn51 min
Dec 9, 4:44 PM CSTSpecial Weather StatementSHVOuachita46 min
Dec 9, 5:10 PM CSTSevere Thunderstorm WarningSHVOuachita, Union19 min
Dec 9, 5:15 PM CSTSevere Thunderstorm WarningSHVOuachita34 min
Dec 9, 5:16 PM CSTSevere Thunderstorm WarningSHVCaldwell, Jackson, Winn44 min
Dec 9, 5:36 PM CSTSpecial Weather StatementSHVNatchitoches24 min
Dec 9, 5:55 PM CSTSevere Thunderstorm WarningSHVGrant, LaSalle65 min
Dec 8, 10:44 PM CSTSpecial Weather StatementSHVSevier61 min
Dec 8, 11:45 PM CSTSpecial Weather StatementSHVHoward60 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2023Every severe thunderstorm warning in 2023

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.