Alert archive / Louisiana / Special Weather Statements in 2021

Special Weather Statement, NWS New Orleans, LA

May 2, 2021Plaquemines Parish, Louisiana

NWS New Orleans, LA issued this special weather statement at May 2, 2021, 11:21 AM CDT for Plaquemines 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
May 2, 2021, 11:21 AM CDT (16:21 UTC)
Expired
May 2, 2021, 12:15 PM CDT
In force
54 min
Issued by
NWS New Orleans, LA

County Plaquemines Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 4.4 hours before the alert went out and 109 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 2021-05-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 793 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 2021-05-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 154 square meters per square second.19395878Sfc1 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
793 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
560 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
154 m²/s²
0-3 km storm-relative helicity
174 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.2

Open this sounding in Storm Lab

The text

As transmitted.

243 
WWUS84 KLIX 021621
SPSLIX

Special Weather Statement
National Weather Service New Orleans LA
1121 AM CDT Sun May 2 2021

LAZ069-021715-
Lower Plaquemines-
1121 AM CDT Sun May 2 2021

...A STRONG THUNDERSTORM WILL AFFECT CENTRAL PLAQUEMINES PARISH...

At 1120 AM CDT, a strong thunderstorm was located 15 miles southwest
of Buras, or 25 miles south of Port Sulphur, moving northeast at 35
mph.

Wind gusts up to 50 mph and half inch hail are possible with this
storm.

Locations impacted include...
Port Sulphur, Boothville-venice, Boothville, Empire, Buras,
Buras-triumph, Venice and Boothville Asos.

LAT...LON 2925 8950 2931 8980 2937 8983 2952 8966
      2940 8952 2940 8957 2939 8956 2933 8920
      2935 8920 2929 8914 2927 8921 2926 8921
      2926 8914 2915 8928 2919 8934 2909 8937
TIME...MOT...LOC 1620Z 242DEG 32KT 2915 8962 

$$

LN

The office that day

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

IssuedProductOfficeCountiesLasted
May 2, 3:34 AM CDTSmall Craft AdvisoryLIX39 hr
May 2, 5:04 AM CDTAreal Flood AdvisoryLIXEast Baton Rouge, Iberville, West Baton Rouge3 hr
May 2, 5:39 AM CDTSpecial Weather StatementLIXAssumption51 min
May 2, 5:43 AM CDTSpecial Weather StatementLIXSaint James47 min
May 2, 6:33 AM CDTSpecial Weather StatementLIXLivingston, Saint John the Baptist, Tangipahoa72 min
May 2, 6:56 AM CDTSevere Thunderstorm WarningLIXLivingston, Saint Helena, Tangipahoa49 min
May 2, 6:58 AM CDTSpecial Marine WarningLIX47 min
May 2, 7:40 AM CDTSpecial Marine WarningLIX65 min
May 2, 7:45 AM CDTSpecial Weather StatementLIXSaint Tammany60 min
May 2, 8:07 AM CDTSpecial Weather StatementLIXSaint Tammany23 min
May 2, 8:32 AM CDTSpecial Weather StatementLIXSaint Tammany43 min
May 2, 8:37 AM CDTSpecial Marine WarningLIX38 min
May 2, 8:43 AM CDTSevere Thunderstorm WarningLIXSaint Tammany47 min
May 2, 9:03 AM CDTSpecial Marine WarningLIX57 min
May 2, 9:17 AM CDTSpecial Weather StatementLIXLafourche28 min
May 2, 9:33 AM CDTSpecial Weather StatementLIXJefferson42 min
May 2, 9:44 AM CDTSpecial Weather StatementLIXLafourche, Saint Charles, Saint James, Saint John the Baptist31 min
May 2, 10:05 AM CDTSpecial Marine WarningLIX55 min
May 2, 10:18 AM CDTSpecial Weather StatementLIXOrleans57 min
May 2, 10:20 AM CDTSpecial Weather StatementLIXJefferson55 min
May 2, 10:51 AM CDTSpecial Marine WarningLIX54 min
May 2, 11:03 AM CDTSpecial Marine WarningLIX57 min
May 2, 11:56 AM CDTSpecial Marine WarningLIX64 min
May 2, 1:24 PM CDTSpecial Marine WarningLIX66 min
May 2, 4:32 PM CDTSpecial Marine WarningLIX44 min
May 2, 5:31 PM CDTSpecial Marine WarningLIX89 min
May 2, 9:38 AM CDTSpecial Weather StatementLIXPearl River52 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.