Alert archive / Louisiana / Wind Advisories in 2020

Wind Advisory 17, NWS New Orleans, LA

December 30, 2020Assumption Parish, Iberville Parish, Louisiana

NWS New Orleans, LA issued this wind advisory at Dec 30, 2020, 1:57 PM CST for Assumption Parish, Iberville Parish, Louisiana. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued: Dec 30, 2020, 1:57 PM CST (19:57 UTC)
Expired: Dec 30, 2020, 5:00 PM CST
In force: 3 hr
Issued by: NWS New Orleans, LA

Counties Assumption Parish, LA, Iberville Parish, LA

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 8.0 hours before the alert went out and 192 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: 166 J/kg
Mixed-layer CIN: -242 J/kg
Mixed-layer LCL: 510 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 170 m²/s²
0-3 km storm-relative helicity: 176 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this wind advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS New Orleans, LA wrote its last area forecast discussion before this wind advisory went out at Dec 30, 11:47 AM CST, 2 hours 10 minutes earlier.

Area forecast discussion, Dec 30, 11:47 AM CST, 2 hours 10 minutes before

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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
Dec 30, 3:41 PM CST	Small Craft Advisory	LIX		40 hr

Nearby

Wind Advisories in Louisiana, 2020 Every wind advisory 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.