Alert archive / Louisiana / Special Weather Statements in 2018

Special Weather Statement, NWS New Orleans, LA

July 31, 2018Washington Parish, Louisiana

NWS New Orleans, LA issued this special weather statement at Jul 31, 2018, 12:49 PM CDT for Washington Parish, Louisiana. It was in force for 41 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
Jul 31, 2018, 12:49 PM CDT (17:49 UTC)
Expired
Jul 31, 2018, 1:30 PM CDT
In force
41 min
Issued by
NWS New Orleans, LA

County Washington Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 5.8 hours before the alert went out and 84 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 2018-07-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2932 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 2018-07-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -47 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
2932 J/kg
Mixed-layer CIN
-6 J/kg
Mixed-layer LCL
754 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
-47 m²/s²
0-3 km storm-relative helicity
-36 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 31, 10:38 AM CDTSpecial Marine WarningLIX52 min
Jul 31, 11:27 AM CDTSpecial Weather StatementLIXSaint James, Saint John the Baptist93 min
Jul 31, 11:29 AM CDTSpecial Weather StatementLIXSaint Bernard46 min
Jul 31, 11:34 AM CDTSpecial Weather StatementLIXWashington56 min
Jul 31, 12:02 PM CDTSpecial Marine WarningLIX118 min
Jul 31, 12:34 PM CDTSpecial Weather StatementLIXSaint Tammany41 min
Jul 31, 1:15 PM CDTSpecial Weather StatementLIXSaint Tammany30 min
Jul 31, 11:55 AM CDTSpecial Weather StatementLIXHancock65 min
Jul 31, 1:19 PM CDTSpecial Weather StatementLIXPearl River26 min
Jul 31, 1:43 PM CDTSpecial Weather StatementLIXPearl River32 min

Nearby

Special Weather Statements in Louisiana, 2018Every special weather statement in 2018

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.