Alert archive / Louisiana / Severe Thunderstorm Warnings in 2022

Severe Thunderstorm Warning 9, NWS New Orleans, LA

March 11, 20224 parishes in Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Mar 11, 2022, 7:22 PM CST for 4 parishes in Louisiana. It was in force for 24 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Mar 11, 2022, 7:22 PM CST (01:22 UTC)
Expired: Mar 11, 2022, 7:46 PM CST
In force: 24 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Jefferson Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 1.4 hours before the alert went out and 55 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: 179 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 519 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 50 m²/s²
0-3 km storm-relative helicity: 139 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.6

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Mar 11, 7:10 PM CST, 12 minutes earlier.

Area forecast discussion, Mar 11, 7:10 PM CST, 12 minutes before

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In the hours before

Special weather statement, Mar 11, 5:44 PM CST, 1 hour 38 minutes before

Special Weather Statement
National Weather Service New Orleans LA
544 PM CST Fri Mar 11 2022

LAZ056-057-059-065-120015-
Upper Terrebonne LA-Assumption LA-St. James LA-Upper Lafourche LA-
544 PM CST Fri Mar 11 2022

...A strong thunderstorm will impact portions of southwestern St.
James, north central Terrebonne, northwestern Lafourche and central
Assumption Parishes through 615 PM CST...

At 544 PM CST, Doppler radar was tracking a strong thunderstorm near
Stephensville, moving east at 45 mph.

HAZARD...Winds in excess of 30 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Thibodaux, Schriever, Supreme, Labadieville, Gray, Chackbay and
Raceland.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 2994 9087 2973 9069 2964 9111 2970 9110
      2974 9111 2975 9109 2978 9110 2981 9110
      2984 9113 2984 9115 2985 9119
TIME...MOT...LOC 2344Z 248DEG 37KT 2975 9111

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...30 MPH

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 11, 6:40 PM CST	Severe Thunderstorm Warning	LIX	Jefferson, Lafourche, Saint Charles	50 min
Mar 11, 6:46 PM CST	Special Marine Warning	LIX		59 min
Mar 11, 6:55 PM CST	Tornado Warning	LIX	Jefferson, Lafourche, Saint Charles	35 min
Mar 11, 6:58 PM CST	Special Marine Warning	LIX		62 min
Mar 11, 7:44 PM CST	Special Marine Warning	LIX		61 min
Mar 11, 7:49 PM CST	Special Marine Warning	LIX		26 min
Mar 11, 8:10 PM CST	Special Weather Statement	LIX	Jefferson	35 min
Mar 11, 8:34 PM CST	Special Marine Warning	LIX		56 min
Mar 12, 4:45 AM CST	Hard Freeze Warning	LIX	East Feliciana, Pointe Coupee, Saint Helena, Tangipahoa, Washington, West Feliciana	28 hr
Mar 12, 7:08 AM CST	Low Water Advisory	LIX		4 hr

Nearby

Severe Thunderstorm Warnings in Louisiana, 2022 Every severe thunderstorm warning in 2022

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.