Alert archive / Louisiana / Special Weather Statements in 2021

Special Weather Statement, NWS New Orleans, LA

August 2, 2021Livingston Parish, Louisiana

NWS New Orleans, LA issued this special weather statement at Aug 2, 2021, 12:21 PM CDT for Livingston Parish, Louisiana. It was in force for 54 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 2, 2021, 12:21 PM CDT (17:21 UTC)
Expired
Aug 2, 2021, 1:15 PM CDT
In force
54 min
Issued by
NWS New Orleans, LA

County Livingston Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 5.4 hours before the alert went out and 114 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 2021-08-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2142 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 2021-08-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 13 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
2142 J/kg
Mixed-layer CIN
-26 J/kg
Mixed-layer LCL
743 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
13 m²/s²
0-3 km storm-relative helicity
20 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

909 
WWUS84 KLIX 021721
SPSLIX

Special Weather Statement
National Weather Service New Orleans LA
1221 PM CDT Mon Aug 2 2021

LAZ048-050-021815-
Livingston-East Baton Rouge-
1221 PM CDT Mon Aug 2 2021

...A STRONG THUNDERSTORM WILL AFFECT CENTRAL LIVINGSTON AND CENTRAL
EAST BATON ROUGE PARISHES...

At 1220 PM CDT, a strong thunderstorm was located over Denham
Springs, moving east at 20 mph.

Wind gusts of 30 to 40 mph along with heavy rain and frequent 
lightning are possible with this storm.

Locations impacted include...
Baton Rouge, Denham Springs, Walker, Livingston, Albany, Watson,
Greenwell Spring and Killian.

This includes Interstate 12 between mile markers 5 and 33.
 
Torrential rainfall is occurring with this storm, and may cause 
localized street flooding. Do not drive your vehicle through flooded 
roadways.

Frequent cloud to ground lightning is also occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

LAT...LON 3060 9102 3059 9057 3032 9057 3043 9105
TIME...MOT...LOC 1720Z 278DEG 15KT 3051 9095 

$$

95/DM

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 2, 6:00 AM CDTSpecial Weather StatementLIXPlaquemines60 min
Aug 2, 10:38 AM CDTSpecial Weather StatementLIXSaint John the Baptist37 min
Aug 2, 10:41 AM CDTSpecial Marine WarningLIX64 min
Aug 2, 10:48 AM CDTSpecial Weather StatementLIXSaint Charles27 min
Aug 2, 10:59 AM CDTSpecial Marine WarningLIX61 min
Aug 2, 11:06 AM CDTSpecial Weather StatementLIXSaint Charles24 min
Aug 2, 11:14 AM CDTSpecial Weather StatementLIXLivingston31 min
Aug 2, 11:28 AM CDTSpecial Weather StatementLIXSaint Charles47 min
Aug 2, 11:31 AM CDTSpecial Weather StatementLIXPointe Coupee44 min
Aug 2, 11:32 AM CDTSpecial Marine WarningLIX58 min
Aug 2, 11:40 AM CDTSpecial Weather StatementLIXLivingston35 min
Aug 2, 12:00 PM CDTSpecial Weather StatementLIXOrleans30 min
Aug 2, 12:02 PM CDTSpecial Weather StatementLIXEast Baton Rouge28 min
Aug 2, 12:05 PM CDTSpecial Weather StatementLIXSaint Tammany25 min
Aug 2, 12:25 PM CDTSpecial Marine WarningLIX27 min
Aug 2, 12:32 PM CDTSpecial Weather StatementLIXJefferson43 min
Aug 2, 12:36 PM CDTSpecial Weather StatementLIXAscension54 min
Aug 2, 1:49 PM CDTSpecial Marine WarningLIX56 min
Aug 2, 12:29 PM CDTSpecial Weather StatementLIXHancock46 min
Aug 2, 1:02 PM CDTSpecial Weather StatementLIXHancock28 min
Aug 2, 1:25 PM CDTSpecial Weather StatementLIXHancock35 min
Aug 2, 1:50 PM CDTSpecial Weather StatementLIXHarrison25 min
Aug 2, 2:11 PM CDTSpecial Weather StatementLIXJackson49 min
Aug 2, 2:16 PM CDTSpecial Weather StatementLIXAmite44 min
Aug 2, 2:58 PM CDTSpecial Weather StatementLIXPike47 min
Aug 2, 3:40 PM CDTSpecial Weather StatementLIXPike50 min

Nearby

Special Weather Statements in Louisiana, 2021Every special weather statement in 2021

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.