Alert archive / Louisiana / Special Weather Statements in 2021

Special Weather Statement, NWS New Orleans, LA

April 16, 2021Iberville Parish, Pointe Coupee Parish, West Baton Rouge Parish, Louisiana

NWS New Orleans, LA issued this special weather statement at Apr 16, 2021, 4:21 AM CDT for Iberville Parish, Pointe Coupee Parish, West Baton Rouge Parish, Louisiana. It was in force for 39 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
Apr 16, 2021, 4:21 AM CDT (09:21 UTC)
Expired
Apr 16, 2021, 5:00 AM CDT
In force
39 min
Issued by
NWS New Orleans, LA

Counties Iberville Parish, LA, Pointe Coupee Parish, LA, West Baton Rouge Parish, LA

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 9.4 hours before the alert went out and 162 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, Lake Charles Mun, LA at 00:00Z on 2021-04-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Lake Charles Mun, LA at 00:00Z on 2021-04-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 115 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
952 m above ground
0-6 km bulk shear
72 kt
0-1 km storm-relative helicity
115 m²/s²
0-3 km storm-relative helicity
210 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

As transmitted.

016 
WWUS84 KLIX 160921
SPSLIX

Special Weather Statement
National Weather Service New Orleans LA
421 AM CDT Fri Apr 16 2021

LAZ034-046>048-161000-
Iberville-Pointe Coupee-West Baton Rouge-East Baton Rouge-
421 AM CDT Fri Apr 16 2021

...A STRONG THUNDERSTORM WILL AFFECT WEST BATON ROUGE...SOUTHERN
POINTE COUPEE...WESTERN IBERVILLE AND SOUTHWESTERN EAST BATON ROUGE
PARISHES...

At 420 AM CDT, a strong thunderstorm was located over Leonville,
moving east at 55 mph.

Winds in excess of 30 mph and half inch hail are possible with this
storm.

Locations impacted include...
Baton Rouge, Baker, Port Allen, New Roads, Addis, Brusly, Livonia,
Maringouin, Fordoche, Rosedale, Grosse Tete, Erwinville, Ramah, Bayou
Sorrel and Lottie.

Frequent cloud to ground lightning is 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 9116 3006 9134 3006 9137 3010 9138
      3011 9147 3019 9147 3020 9149 3023 9148
      3024 9157 3036 9164 3045 9164 3050 9171
      3050 9175 3051 9173 3056 9176 3067 9173
      3076 9176
TIME...MOT...LOC 0920Z 283DEG 46KT 3048 9194 

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 15, 9:06 PM CDTRiver Flood AdvisoryLIXTangipahoa39 hr
Apr 16, 4:56 AM CDTSpecial Weather StatementLIXEast Baton Rouge, Iberville, Pointe Coupee, West Baton Rouge64 min
Apr 16, 5:23 AM CDTSpecial Weather StatementLIXAscension, East Baton Rouge, Iberville, Livingston, Saint James, West Baton Rouge37 min
Apr 16, 5:45 AM CDTSpecial Weather StatementLIXAscension, Livingston, Saint James, Saint John the Baptist30 min
Apr 16, 5:49 AM CDTSpecial Marine WarningLIX56 min
Apr 16, 6:12 AM CDTSpecial Weather StatementLIXAscension, Assumption, Saint James48 min
Apr 16, 6:16 AM CDTSpecial Weather StatementLIXOrleans, Saint John the Baptist, Saint Tammany44 min
Apr 16, 6:39 AM CDTSpecial Marine WarningLIX51 min
Apr 16, 6:59 AM CDTSpecial Weather StatementLIXOrleans46 min
Apr 16, 7:19 AM CDTSpecial Marine WarningLIX56 min
Apr 16, 7:51 AM CDTSpecial Weather StatementLIXJefferson24 min
Apr 16, 9:23 AM CDTSpecial Weather StatementLIXPlaquemines37 min
Apr 16, 9:34 AM CDTTornado WarningLIXPlaquemines11 min
Apr 16, 9:50 AM CDTSpecial Weather StatementLIXTerrebonne55 min
Apr 16, 9:51 AM CDTSpecial Marine WarningLIX54 min
Apr 16, 9:54 AM CDTSpecial Marine WarningLIX66 min
Apr 16, 10:28 AM CDTSpecial Marine WarningLIX62 min
Apr 16, 10:39 AM CDTSpecial Marine WarningLIX66 min
Apr 16, 11:24 AM CDTSpecial Marine WarningLIX66 min
Apr 16, 11:33 AM CDTSpecial Marine WarningLIX57 min
Apr 16, 12:02 PM CDTSpecial Marine WarningLIX58 min
Apr 16, 12:25 PM CDTSpecial Marine WarningLIX65 min
Apr 16, 12:47 PM CDTSpecial Marine WarningLIX28 min
Apr 16, 1:12 PM CDTSpecial Marine WarningLIX33 min
Apr 16, 1:25 PM CDTSpecial Marine WarningLIX50 min
Apr 15, 8:18 PM CDTRiver Flood WarningLIXHancock11 hr
Apr 15, 9:06 PM CDTRiver Flood AdvisoryLIXPike13 hr
Apr 16, 9:27 AM CDTRiver Flood WarningLIXHancock25 hr
Apr 16, 10:12 AM CDTRiver Flood WarningLIXPike39 hr

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.