Alert archive / Louisiana / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 239, NWS New Orleans, LA

August 27, 2023Jefferson Parish, Saint Charles Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Aug 27, 2023, 5:35 PM CDT for Jefferson Parish, Saint Charles Parish, Louisiana. It was in force for 26 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: Aug 27, 2023, 5:35 PM CDT (22:35 UTC)
Expired: Aug 27, 2023, 6:01 PM CDT
In force: 26 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

Counties Jefferson Parish, LA, Saint Charles Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 10.6 hours before the alert went out and 72 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: 1096 J/kg
Mixed-layer CIN: -181 J/kg
Mixed-layer LCL: 1934 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 32 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Aug 27, 3:44 PM CDT, 1 hour 51 minutes earlier.

Area forecast discussion, Aug 27, 3:44 PM CDT, 1 hour 51 minutes before

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In the hours before

Special weather statement, Aug 27, 5:07 PM CDT, 28 minutes before

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Local storm report, Aug 27, 5:09 PM CDT, 26 minutes before

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Local storm report, Aug 27, 5:12 PM CDT, 23 minutes before

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Special weather statement, Aug 27, 5:14 PM CDT, 21 minutes before

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Special weather statement, Aug 27, 5:28 PM CDT, 7 minutes before

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Special weather statement, Aug 27, 5:29 PM CDT, 6 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
Aug 27, 12:49 AM CDT	Special Marine Warning	LIX		39 min
Aug 27, 3:45 AM CDT	Excessive Heat Watch	LIX	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberville, Jefferson and 13 more	11 hr
Aug 27, 2:05 PM CDT	Special Weather Statement	LIX	Livingston	25 min
Aug 27, 2:06 PM CDT	Special Weather Statement	LIX	Tangipahoa	24 min
Aug 27, 2:35 PM CDT	Special Weather Statement	LIX	Livingston	25 min
Aug 27, 2:37 PM CDT	Special Weather Statement	LIX	Saint Helena	23 min
Aug 27, 2:39 PM CDT	Heat Advisory	LIX	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberville, Jefferson and 13 more	28 hr
Aug 27, 2:40 PM CDT	Special Weather Statement	LIX	Tangipahoa	35 min
Aug 27, 2:59 PM CDT	Special Weather Statement	LIX	Saint Helena	46 min
Aug 27, 3:01 PM CDT	Special Weather Statement	LIX	Livingston	44 min
Aug 27, 3:05 PM CDT	Special Weather Statement	LIX	Saint Tammany	25 min
Aug 27, 3:17 PM CDT	Special Weather Statement	LIX	Saint James	43 min
Aug 27, 3:22 PM CDT	Severe Thunderstorm Warning	LIX	Saint John the Baptist, Saint Tammany, Tangipahoa	38 min
Aug 27, 3:27 PM CDT	Severe Thunderstorm Warning	LIX	Ascension, Livingston, Saint James, Saint John the Baptist	48 min
Aug 27, 3:28 PM CDT	Special Weather Statement	LIX	Saint Tammany	47 min
Aug 27, 3:33 PM CDT	Special Marine Warning	LIX		57 min
Aug 27, 3:38 PM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany	35 min
Aug 27, 3:44 PM CDT	Special Weather Statement	LIX	Tangipahoa	46 min
Aug 27, 4:02 PM CDT	Special Weather Statement	LIX	Ascension	43 min
Aug 27, 4:03 PM CDT	Special Marine Warning	LIX		57 min
Aug 27, 4:06 PM CDT	Severe Thunderstorm Warning	LIX	Ascension, Assumption, Lafourche, Saint James, Saint John the Baptist	39 min
Aug 27, 4:08 PM CDT	Severe Thunderstorm Warning	LIX	Ascension, Assumption, East Baton Rouge, Iberville, Livingston, Saint James	35 min
Aug 27, 4:11 PM CDT	Special Weather Statement	LIX	East Baton Rouge	49 min
Aug 27, 4:14 PM CDT	Special Weather Statement	LIX	Saint Tammany	31 min
Aug 27, 4:26 PM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany	49 min
Aug 27, 4:36 PM CDT	Special Weather Statement	LIX	Assumption	24 min
Aug 27, 4:54 PM CDT	Special Marine Warning	LIX		66 min
Aug 27, 4:55 PM CDT	Special Marine Warning	LIX		27 min
Aug 27, 4:56 PM CDT	Special Weather Statement	LIX	Lafourche	49 min
Aug 27, 4:57 PM CDT	Special Marine Warning	LIX		12 min
Aug 27, 5:08 PM CDT	Special Marine Warning	LIX		52 min
Aug 27, 5:14 PM CDT	Special Weather Statement	LIX	Saint Charles	46 min
Aug 27, 5:20 PM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Saint Charles	40 min
Aug 27, 5:22 PM CDT	Severe Thunderstorm Warning	LIX	Terrebonne	38 min
Aug 27, 5:46 PM CDT	Special Weather Statement	LIX	St. Mary	29 min
Aug 27, 5:48 PM CDT	Special Marine Warning	LIX		41 min
Aug 27, 5:51 PM CDT	Special Weather Statement	LIX	Terrebonne	24 min
Aug 27, 5:55 PM CDT	Special Marine Warning	LIX		65 min
Aug 27, 6:10 PM CDT	Special Weather Statement	LIX	Saint Helena	35 min
Aug 27, 6:13 PM CDT	Special Weather Statement	LIX	Terrebonne	32 min
Aug 27, 6:29 PM CDT	Special Marine Warning	LIX		50 min
Aug 27, 1:40 PM CDT	Special Weather Statement	LIX	Hancock	20 min
Aug 27, 4:04 PM CDT	Special Weather Statement	LIX	Hancock	41 min
Aug 27, 4:18 PM CDT	Special Weather Statement	LIX	Jackson	27 min
Aug 27, 4:31 PM CDT	Special Weather Statement	LIX	Harrison	29 min
Aug 27, 4:38 PM CDT	Special Weather Statement	LIX	Hancock	52 min
Aug 27, 4:46 PM CDT	Special Weather Statement	LIX	Jackson	29 min
Aug 27, 4:52 PM CDT	Severe Thunderstorm Warning	LIX	Hancock, Harrison	38 min
Aug 27, 5:07 PM CDT	Special Weather Statement	LIX	Harrison	23 min
Aug 27, 5:28 PM CDT	Special Weather Statement	LIX	Harrison	32 min
Aug 27, 5:29 PM CDT	Special Weather Statement	LIX	Hancock	31 min
Aug 27, 6:33 PM CDT	Special Weather Statement	LIX	Jackson	27 min
Aug 27, 6:37 PM CDT	Severe Thunderstorm Warning	LIX	Jackson	38 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2023 Every severe thunderstorm warning in 2023

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.