Alert archive / Louisiana / Special Weather Statements in 2021

Special Weather Statement, NWS New Orleans, LA

April 10, 20214 parishes in Louisiana

NWS New Orleans, LA issued this special weather statement at Apr 10, 2021, 6:42 AM CDT for 4 parishes in Louisiana. It was in force for 78 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: Apr 10, 2021, 6:42 AM CDT (11:42 UTC)
Expired: Apr 10, 2021, 8:00 AM CDT
In force: 78 min
Issued by: NWS New Orleans, LA

Counties Jefferson Parish, LA, Lafourche Parish, LA, Plaquemines Parish, LA, Terrebonne Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 11.7 hours before the alert went out and 110 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: 2977 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 599 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 243 m²/s²
0-3 km storm-relative helicity: 269 m²/s²
Significant tornado parameter: 3.4
Supercell composite: 18.1

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Apr 10, 3:58 AM CDT, 2 hours 44 minutes earlier.

Area forecast discussion, Apr 10, 3:58 AM CDT, 2 hours 44 minutes before

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In the hours before

Local storm report, Apr 10, 5:27 AM CDT, 1 hour 15 minutes before

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Special weather statement, Apr 10, 5:35 AM CDT, 1 hour 7 minutes before

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Special weather statement, Apr 10, 5:46 AM CDT, 56 minutes before

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Local storm report, Apr 10, 5:52 AM CDT, 50 minutes before

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Local storm report, Apr 10, 6:18 AM CDT, 24 minutes before

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Special weather statement, Apr 10, 6:42 AM CDT, 0 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
Apr 10, 12:41 AM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany, Washington	11 min
Apr 10, 1:07 AM CDT	Special Marine Warning	LIX		22 min
Apr 10, 1:40 AM CDT	Special Marine Warning	LIX		20 min
Apr 10, 1:45 AM CDT	Tornado Warning	LIX	Pointe Coupee, West Feliciana	45 min
Apr 10, 1:52 AM CDT	Special Weather Statement	LIX	Saint Tammany	38 min
Apr 10, 2:01 AM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany, Washington	29 min
Apr 10, 2:05 AM CDT	Tornado Warning	LIX	Saint Tammany	10 min
Apr 10, 2:28 AM CDT	Severe Thunderstorm Warning	LIX	Pointe Coupee, West Feliciana	47 min
Apr 10, 2:48 AM CDT	Severe Thunderstorm Warning	LIX	East Baton Rouge, East Feliciana, Saint Helena, West Feliciana	39 min
Apr 10, 2:58 AM CDT	Severe Thunderstorm Warning	LIX	Saint Helena, Tangipahoa	35 min
Apr 10, 3:20 AM CDT	Severe Thunderstorm Warning	LIX	East Baton Rouge, East Feliciana, Pointe Coupee, West Baton Rouge, West Feliciana	33 min
Apr 10, 3:25 AM CDT	Special Weather Statement	LIX	Saint Helena, Tangipahoa	65 min
Apr 10, 3:26 AM CDT	Special Weather Statement	LIX	Ascension, Assumption, Livingston, Saint James, Saint John the Baptist	64 min
Apr 10, 3:38 AM CDT	Special Marine Warning	LIX		67 min
Apr 10, 3:59 AM CDT	Special Weather Statement	LIX	East Baton Rouge	46 min
Apr 10, 4:16 AM CDT	Special Marine Warning	LIX		59 min
Apr 10, 4:23 AM CDT	Tornado Warning	LIX	Saint James, Saint John the Baptist	19 min
Apr 10, 4:40 AM CDT	Flash Flood Warning	LIX	Saint Tammany, Tangipahoa, Washington	3 hr
Apr 10, 4:47 AM CDT	Special Weather Statement	LIX	Ascension, Assumption, Orleans, Saint Charles, Saint James, Saint John the Baptist and 1 more	58 min
Apr 10, 4:58 AM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Orleans, Plaquemines, Saint Bernard, Saint Charles, Saint Tammany	47 min
Apr 10, 5:16 AM CDT	Flash Flood Warning	LIX	Orleans	3 hr
Apr 10, 5:23 AM CDT	Special Marine Warning	LIX		67 min
Apr 10, 5:24 AM CDT	Flash Flood Warning	LIX	Saint Bernard	3 hr
Apr 10, 5:46 AM CDT	Special Weather Statement	LIX	Assumption, Jefferson, Orleans, Saint Charles	59 min
Apr 10, 6:07 AM CDT	Areal Flood Advisory	LIX	Jefferson, Lafourche, Orleans, Saint Charles, Saint John the Baptist, Terrebonne	2 hr
Apr 10, 6:24 AM CDT	Special Marine Warning	LIX		96 min
Apr 10, 6:29 AM CDT	Flash Flood Warning	LIX	Lafourche, Terrebonne	89 min
Apr 10, 6:33 AM CDT	Flash Flood Warning	LIX	Jefferson, Plaquemines	105 min
Apr 10, 7:13 AM CDT	Special Marine Warning	LIX		92 min
Apr 10, 7:53 AM CDT	Special Marine Warning	LIX		97 min
Apr 10, 8:52 AM CDT	River Flood Warning	LIX	Saint Tammany	10 days
Apr 10, 8:52 AM CDT	River Flood Warning	LIX	Saint Tammany	24 hr
Apr 10, 8:55 AM CDT	River Flood Warning	LIX	Saint Tammany	25 hr
Apr 10, 9:49 AM CDT	River Flood Warning	LIX	Washington	33 hr
Apr 10, 11:15 AM CDT	Special Weather Statement	LIX	Terrebonne	30 min
Apr 10, 11:51 AM CDT	Special Weather Statement	LIX	Lafourche	39 min
Apr 10, 12:28 PM CDT	Special Weather Statement	LIX	Jefferson	32 min
Apr 10, 5:46 PM CDT	River Flood Warning	LIX	Saint Helena	26 hr
Apr 9, 11:57 PM CDT	Severe Thunderstorm Warning	LIX	Amite, Pike	36 min
Apr 10, 12:12 AM CDT	Severe Thunderstorm Warning	LIX	Walthall	33 min
Apr 10, 12:14 AM CDT	Special Weather Statement	LIX	Wilkinson	46 min
Apr 10, 12:46 AM CDT	Severe Thunderstorm Warning	LIX	Amite, Pike, Walthall	43 min
Apr 10, 1:33 AM CDT	Special Weather Statement	LIX	Pearl River	42 min
Apr 10, 2:42 AM CDT	Severe Thunderstorm Warning	LIX	Hancock, Harrison	33 min
Apr 10, 3:11 AM CDT	Severe Thunderstorm Warning	LIX	Harrison, Jackson	49 min
Apr 10, 3:29 AM CDT	Severe Thunderstorm Warning	LIX	Harrison, Jackson	31 min
Apr 10, 3:36 AM CDT	Special Weather Statement	LIX	Pearl River	39 min
Apr 10, 3:55 AM CDT	Severe Thunderstorm Warning	LIX	Harrison, Jackson	14 min
Apr 10, 4:06 AM CDT	Flash Flood Warning	LIX	Hancock, Pearl River	3 hr
Apr 10, 5:07 AM CDT	Special Weather Statement	LIX	Hancock	23 min
Apr 10, 5:35 AM CDT	Special Weather Statement	LIX	Harrison	25 min
Apr 10, 6:02 AM CDT	Areal Flood Advisory	LIX	Jackson	3 hr
Apr 10, 9:49 AM CDT	River Flood Warning	LIX	Pike, Walthall	56 hr
Apr 10, 9:58 AM CDT	River Flood Warning	LIX	Harrison	25 hr

Nearby

Special Weather Statements in Louisiana, 2021 Every special weather statement in 2021

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.