Alert archive / Louisiana / Flash Flood Warnings in 2023

Flash Flood Warning 49, NWS New Orleans, LA

November 21, 2023Saint Charles Parish, Saint James Parish, Saint John the Baptist Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at Nov 21, 2023, 1:34 AM CST for Saint Charles Parish, Saint James Parish, Saint John the Baptist Parish, Louisiana. It was in force for 93 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: Nov 21, 2023, 1:34 AM CST (07:34 UTC)
Expired: Nov 21, 2023, 3:07 AM CST
In force: 93 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon
Flood severity: None

Counties Saint Charles Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 7.6 hours before the alert went out and 256 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: 1112 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 767 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 212 m²/s²
0-3 km storm-relative helicity: 246 m²/s²
Significant tornado parameter: 1.6
Supercell composite: 8.8

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood 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 flash flood warning went out at Nov 21, 12:08 AM CST, 1 hour 26 minutes earlier.

Area forecast discussion, Nov 21, 12:08 AM CST, 1 hour 26 minutes before

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In the hours before

Special weather statement, Nov 20, 10:37 PM CST, 2 hours 57 minutes before

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Special weather statement, Nov 20, 11:16 PM CST, 2 hours 18 minutes before

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Special weather statement, Nov 20, 11:45 PM CST, 1 hour 49 minutes before

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Special weather statement, Nov 20, 11:48 PM CST, 1 hour 46 minutes before

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Special weather statement, Nov 21, 12:22 AM CST, 1 hour 12 minutes before

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Special weather statement, Nov 21, 1:10 AM CST, 24 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
Nov 20, 11:45 PM CST	Special Weather Statement	LIX	Ascension, Saint James	30 min
Nov 20, 11:48 PM CST	Special Weather Statement	LIX	Tangipahoa, Washington	27 min
Nov 21, 12:15 AM CST	Special Marine Warning	LIX		60 min
Nov 21, 12:22 AM CST	Special Weather Statement	LIX	Washington	38 min
Nov 21, 12:37 AM CST	Special Marine Warning	LIX		53 min
Nov 21, 12:57 AM CST	Flood Watch	LIX	Saint James, Saint John the Baptist	2 hr
Nov 21, 1:22 AM CST	Areal Flood Advisory	LIX	Saint Charles, Saint James, Saint John the Baptist	12 min
Nov 21, 1:27 AM CST	Special Marine Warning	LIX		63 min
Nov 21, 3:51 AM CST	Special Marine Warning	LIX		39 min
Nov 21, 4:20 AM CST	Special Marine Warning	LIX		40 min
Nov 21, 4:32 AM CST	Special Weather Statement	LIX	Plaquemines	43 min
Nov 21, 4:54 AM CST	Special Marine Warning	LIX		47 min
Nov 20, 7:45 PM CST	Tornado Warning	LIX	Wilkinson	45 min
Nov 20, 9:02 PM CST	Severe Thunderstorm Warning	LIX	Amite	43 min
Nov 20, 10:31 PM CST	Flash Flood Warning	LIX	Pike	2 hr
Nov 20, 10:37 PM CST	Special Weather Statement	LIX	Pike, Walthall	38 min
Nov 20, 11:16 PM CST	Special Weather Statement	LIX	Walthall	44 min
Nov 21, 1:10 AM CST	Special Weather Statement	LIX	Pearl River	35 min
Nov 21, 1:51 AM CST	Special Weather Statement	LIX	Hancock	24 min
Nov 21, 4:47 AM CST	Areal Flood Advisory	LIX	Hancock, Harrison	118 min

Nearby

Flash Flood Warnings in Louisiana, 2023 Every flash flood 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.