Alert archive / Louisiana / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 199, NWS Shreveport, LA

September 7, 2018Claiborne Parish, Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at Sep 7, 2018, 6:04 PM CDT for Claiborne Parish, Louisiana. It was in force for 41 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 7, 2018, 6:04 PM CDT (23:04 UTC)
Expired
Sep 7, 2018, 6:45 PM CDT
In force
41 min
Issued by
NWS Shreveport, LA
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

County Claiborne Parish, LA

The radar

The Shreveport radar (KSHV), 89 km from the middle of the area, began a volume at 23:08 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

Jackson, MS (KJAN), launched 12:00Z, 11.1 hours before the alert went out and 279 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 12:00Z on 2018-09-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 865 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 12:00Z on 2018-09-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -20 square meters per square second.1939Sfc1 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
865 J/kg
Mixed-layer CIN
-48 J/kg
Mixed-layer LCL
613 m above ground
0-6 km bulk shear
2 kt
0-1 km storm-relative helicity
-20 m²/s²
0-3 km storm-relative helicity
-8 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 7, 9:51 AM CDTAreal Flood AdvisorySHVHarrison3 hr
Sep 7, 4:39 PM CDTSpecial Weather StatementSHVFranklin51 min
Sep 7, 5:20 PM CDTSpecial Weather StatementSHVRusk55 min
Sep 7, 6:51 PM CDTSpecial Weather StatementSHVRed River54 min
Sep 7, 3:11 PM CDTSpecial Weather StatementSHVWebster49 min
Sep 7, 4:26 PM CDTSpecial Weather StatementSHVCaddo64 min
Sep 7, 4:33 PM CDTSpecial Weather StatementSHVCaddo57 min
Sep 7, 4:54 PM CDTSpecial Weather StatementSHVLincoln66 min
Sep 7, 5:26 PM CDTSpecial Weather StatementSHVBienville64 min
Sep 7, 5:34 PM CDTSpecial Weather StatementSHVLincoln56 min
Sep 7, 5:59 PM CDTSpecial Weather StatementSHVClaiborne61 min
Sep 7, 6:29 PM CDTSpecial Weather StatementSHVUnion61 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2018Every severe thunderstorm warning in 2018

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.