Alert archive / Louisiana / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 93, NWS New Orleans, LA

July 11, 2018Assumption Parish, Saint James Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Jul 11, 2018, 3:07 PM CDT for Assumption Parish, Saint James Parish, Louisiana. It was in force for 23 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
Jul 11, 2018, 3:07 PM CDT (20:07 UTC)
Expired
Jul 11, 2018, 3:30 PM CDT
In force
23 min
Issued by
NWS New Orleans, LA
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Assumption Parish, LA, Saint James Parish, LA

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 8.1 hours before the alert went out and 274 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 2018-07-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1130 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 2018-07-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -5 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
1130 J/kg
Mixed-layer CIN
-51 J/kg
Mixed-layer LCL
966 m above ground
0-6 km bulk shear
5 kt
0-1 km storm-relative helicity
-5 m²/s²
0-3 km storm-relative helicity
3 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 11, 8:05 AM CDTSpecial Marine WarningLIX55 min
Jul 11, 8:52 AM CDTSpecial Marine WarningLIX53 min
Jul 11, 10:56 AM CDTSpecial Marine WarningLIX64 min
Jul 11, 11:55 AM CDTSpecial Marine WarningLIX95 min
Jul 11, 1:23 PM CDTSpecial Marine WarningLIX67 min
Jul 11, 2:18 PM CDTSpecial Weather StatementLIXIberville57 min
Jul 11, 2:36 PM CDTAreal Flood AdvisoryLIXAscension, Assumption, Iberville54 min
Jul 11, 2:56 PM CDTSpecial Weather StatementLIXSaint James34 min
Jul 11, 3:12 PM CDTSpecial Weather StatementLIXSaint John the Baptist33 min
Jul 11, 4:03 PM CDTSpecial Weather StatementLIXSaint Helena57 min
Jul 11, 4:16 PM CDTAreal Flood AdvisoryLIXLivingston, Saint Helena, Tangipahoa59 min
Jul 11, 12:29 PM CDTSpecial Weather StatementLIXHancock61 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.