Alert archive / Louisiana / Special Weather Statements in 2015

Special Weather Statement, NWS New Orleans, LA

April 18, 2015Jefferson Parish, Lafourche Parish, Terrebonne Parish, Louisiana

NWS New Orleans, LA issued this special weather statement at Apr 18, 2015, 3:21 AM CDT for Jefferson Parish, Lafourche Parish, Terrebonne 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
Apr 18, 2015, 3:21 AM CDT (08:21 UTC)
Expired
Apr 18, 2015, 4:15 AM CDT
In force
54 min
Issued by
NWS New Orleans, LA

Counties Jefferson Parish, LA, Lafourche Parish, LA, Terrebonne Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 8.4 hours before the alert went out and 119 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 00:00Z on 2015-04-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1229 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 00:00Z on 2015-04-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 2 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
1229 J/kg
Mixed-layer CIN
-31 J/kg
Mixed-layer LCL
1080 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
2 m²/s²
0-3 km storm-relative helicity
57 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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The office that day

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

IssuedProductOfficeCountiesLasted
Apr 18, 1:54 AM CDTSpecial Weather StatementLIXTerrebonne21 min
Apr 18, 2:21 AM CDTSpecial Weather StatementLIXJefferson, Lafourche, Terrebonne54 min
Apr 18, 3:14 AM CDTAreal Flood AdvisoryLIXLafourche, Terrebonne2 hr
Apr 18, 3:52 AM CDTSpecial Marine WarningLIX23 min
Apr 18, 4:18 AM CDTSpecial Marine WarningLIX57 min
Apr 18, 4:26 AM CDTSpecial Weather StatementLIXPlaquemines64 min
Apr 18, 4:31 AM CDTSpecial Weather StatementLIXTerrebonne44 min
Apr 18, 5:16 AM CDTSpecial Marine WarningLIX59 min
Apr 18, 5:29 AM CDTSpecial Weather StatementLIXPlaquemines31 min
Apr 18, 5:51 AM CDTSpecial Marine WarningLIX54 min
Apr 18, 6:08 AM CDTSpecial Marine WarningLIX52 min
Apr 18, 6:48 AM CDTAreal Flood AdvisoryLIXAscension, Assumption, Iberville, Lafourche, Saint James, Terrebonne3 hr
Apr 18, 7:10 AM CDTSpecial Marine WarningLIX35 min
Apr 18, 8:29 AM CDTSpecial Marine WarningLIX61 min
Apr 18, 9:29 AM CDTSpecial Marine WarningLIX61 min
Apr 18, 9:55 AM CDTSpecial Marine WarningLIX65 min
Apr 18, 10:27 AM CDTSpecial Marine WarningLIX63 min
Apr 18, 10:58 AM CDTSpecial Marine WarningLIX32 min
Apr 18, 11:06 AM CDTSpecial Marine WarningLIX54 min
Apr 18, 11:15 AM CDTSpecial Marine WarningLIX60 min
Apr 18, 11:36 AM CDTSpecial Marine WarningLIX39 min
Apr 18, 12:12 PM CDTSpecial Marine WarningLIX33 min
Apr 18, 12:27 PM CDTSpecial Marine WarningLIX63 min
Apr 18, 1:02 PM CDTSpecial Marine WarningLIX28 min
Apr 18, 1:29 PM CDTSpecial Marine WarningLIX61 min
Apr 18, 1:34 PM CDTSpecial Marine WarningLIX56 min
Apr 18, 2:28 PM CDTSpecial Marine WarningLIX32 min
Apr 18, 2:29 PM CDTSpecial Marine WarningLIX61 min

Nearby

Special Weather Statements in Louisiana, 2015Every special weather statement in 2015

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.