Alert archive / Louisiana / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 84, NWS New Orleans, LA

July 8, 2020Washington Parish, Louisiana; Pearl River County, Mississippi

NWS New Orleans, LA issued this severe thunderstorm warning at Jul 8, 2020, 3:43 PM CDT for Washington Parish, Louisiana; Pearl River County, Mississippi. It was in force for 32 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 8, 2020, 3:43 PM CDT (20:43 UTC)
Expired
Jul 8, 2020, 4:15 PM CDT
In force
32 min
Issued by
NWS New Orleans, LA
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Washington Parish, LA, Pearl River County, MS

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 8.7 hours before the alert went out and 63 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, Slidell Radar S, LA at 12:00Z on 2020-07-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2361 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, Slidell Radar S, LA at 12:00Z on 2020-07-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 71 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
2361 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
619 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
71 m²/s²
0-3 km storm-relative helicity
85 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 8, 2:51 PM CDTSpecial Weather StatementLIXWashington54 min
Jul 8, 3:35 PM CDTSpecial Weather StatementLIXWashington70 min
Jul 8, 8:56 AM CDTSpecial Weather StatementLIXWilkinson49 min
Jul 8, 11:03 AM CDTSpecial Weather StatementLIXHarrison42 min
Jul 8, 11:09 AM CDTSpecial Weather StatementLIXJackson21 min
Jul 8, 11:45 AM CDTSpecial Weather StatementLIXJackson45 min
Jul 8, 1:53 PM CDTSpecial Weather StatementLIXHarrison52 min
Jul 8, 2:23 PM CDTSevere Thunderstorm WarningLIXHarrison, Jackson37 min
Jul 8, 4:17 PM CDTSpecial Weather StatementLIXHancock, Harrison, Pearl River88 min
Jul 8, 4:48 PM CDTSpecial Weather StatementLIXJackson57 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2020Severe Thunderstorm Warnings in Mississippi, 2020Every severe thunderstorm warning in 2020

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.