Alert archive / Louisiana / Special Weather Statements in 2021

Special Weather Statement, NWS New Orleans, LA

August 15, 2021Saint Tammany Parish, Louisiana

NWS New Orleans, LA issued this special weather statement at Aug 15, 2021, 1:41 PM CDT for Saint Tammany Parish, Louisiana. It was in force for 34 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 15, 2021, 1:41 PM CDT (18:41 UTC)
Expired: Aug 15, 2021, 2:15 PM CDT
In force: 34 min
Issued by: NWS New Orleans, LA
Hail: 0.00 in
Wind: 40

County Saint Tammany Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 6.7 hours before the alert went out and 47 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 735 J/kg
Mixed-layer CIN: -61 J/kg
Mixed-layer LCL: 968 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: -5 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.

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 14, 10:13 PM CDT	Tropical Storm Watch	LIX		7 hr
Aug 15, 4:49 AM CDT	Coastal Flood Advisory	LIX	Orleans, Saint Bernard, Saint Tammany	50 hr
Aug 15, 4:57 AM CDT	Small Craft Advisory	LIX		38 hr
Aug 15, 3:37 PM CDT	Special Weather Statement	LIX	West Baton Rouge	23 min

Nearby

Special Weather Statements in Louisiana, 2021 Every 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.