Alert archive / Louisiana / Special Weather Statements in 2020

Special Weather Statement, NWS New Orleans, LA

September 28, 2020Saint Tammany Parish, Louisiana; Pearl River County, Mississippi

NWS New Orleans, LA issued this special weather statement at Sep 28, 2020, 2:21 PM CDT for Saint Tammany Parish, Louisiana; Pearl River County, Mississippi. 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: Sep 28, 2020, 2:21 PM CDT (19:21 UTC)
Expired: Sep 28, 2020, 3:15 PM CDT
In force: 54 min
Issued by: NWS New Orleans, LA

Counties Saint Tammany Parish, LA, Pearl River County, MS

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 7.4 hours before the alert went out and 27 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: 1407 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 700 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 47 m²/s²
0-3 km storm-relative helicity: 134 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
Sep 27, 9:37 PM CDT	Small Craft Advisory	LIX		54 hr
Sep 28, 7:21 AM CDT	Dense Fog Advisory	LIX	East Baton Rouge, East Feliciana, Iberville, Pointe Coupee, Saint Helena, Tangipahoa and 3 more	99 min
Sep 28, 7:59 AM CDT	Special Marine Warning	LIX		91 min
Sep 28, 9:03 AM CDT	Special Marine Warning	LIX		87 min
Sep 28, 1:36 PM CDT	Special Weather Statement	LIX	Tangipahoa	39 min
Sep 28, 1:57 PM CDT	Special Marine Warning	LIX		48 min
Sep 28, 2:23 PM CDT	Special Marine Warning	LIX		22 min
Sep 28, 2:45 PM CDT	Special Marine Warning	LIX		49 min
Sep 28, 2:50 PM CDT	Special Weather Statement	LIX	Orleans	55 min
Sep 28, 3:10 PM CDT	Special Weather Statement	LIX	Jefferson	50 min
Sep 28, 2:59 PM CDT	Special Weather Statement	LIX	Hancock, Harrison	61 min
Sep 28, 3:49 PM CDT	Special Weather Statement	LIX	Harrison, Jackson	71 min

Nearby

Special Weather Statements in Louisiana, 2020 Special Weather Statements in Mississippi, 2020 Every special weather statement in 2020

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.