Alert archive / Louisiana / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 155, NWS New Orleans, LA

August 26, 2019Saint Tammany Parish, Tangipahoa Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Aug 26, 2019, 9:57 AM CDT for Saint Tammany Parish, Tangipahoa Parish, Louisiana. It was in force for 33 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 26, 2019, 9:57 AM CDT (14:57 UTC)
Expired: Aug 26, 2019, 10:30 AM CDT
In force: 33 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Saint Tammany Parish, LA, Tangipahoa Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 3.0 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: 1039 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 723 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 76 m²/s²
0-3 km storm-relative helicity: 181 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 26, 9:53 AM CDT, 4 minutes earlier.

Area forecast discussion, Aug 26, 9:53 AM CDT, 4 minutes before

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Hazardous weather outlook, Aug 26, 7:46 AM CDT, 2 hours 11 minutes before

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In the hours before

Special weather statement, Aug 26, 7:56 AM CDT, 2 hours 1 minute before

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Special weather statement, Aug 26, 8:37 AM CDT, 1 hour 20 minutes before

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Special weather statement, Aug 26, 8:50 AM CDT, 1 hour 7 minutes before

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Special weather statement, Aug 26, 9:13 AM CDT, 44 minutes before

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Special weather statement, Aug 26, 9:29 AM CDT, 28 minutes before

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Local storm report, Aug 26, 9:52 AM CDT, 5 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 26, 5:27 AM CDT	Special Marine Warning	LIX		63 min
Aug 26, 6:53 AM CDT	Special Marine Warning	LIX		37 min
Aug 26, 7:56 AM CDT	Special Weather Statement	LIX	Tangipahoa, Washington	64 min
Aug 26, 8:34 AM CDT	Special Marine Warning	LIX		26 min
Aug 26, 8:37 AM CDT	Special Weather Statement	LIX	Ascension	23 min
Aug 26, 8:50 AM CDT	Special Weather Statement	LIX	Saint Tammany	25 min
Aug 26, 9:01 AM CDT	Special Marine Warning	LIX		44 min
Aug 26, 9:13 AM CDT	Special Weather Statement	LIX	Ascension	47 min
Aug 26, 9:29 AM CDT	Special Weather Statement	LIX	Saint Tammany	31 min
Aug 26, 9:44 AM CDT	Special Marine Warning	LIX		31 min
Aug 26, 10:01 AM CDT	Special Marine Warning	LIX		59 min
Aug 26, 10:28 AM CDT	Special Weather Statement	LIX	Saint Tammany	32 min
Aug 26, 10:48 AM CDT	Special Marine Warning	LIX		57 min
Aug 26, 11:02 AM CDT	Special Weather Statement	LIX	Saint Tammany	28 min
Aug 26, 11:52 AM CDT	Special Weather Statement	LIX	Iberville	38 min
Aug 26, 12:51 PM CDT	Special Weather Statement	LIX	Ascension, Livingston, Saint John the Baptist	39 min
Aug 26, 1:17 PM CDT	Special Weather Statement	LIX	Saint Helena	28 min
Aug 26, 1:51 PM CDT	Special Weather Statement	LIX	Orleans	24 min
Aug 26, 2:33 PM CDT	Special Marine Warning	LIX		27 min
Aug 26, 2:58 PM CDT	Areal Flood Advisory	LIX	Orleans	2 hr
Aug 26, 3:07 PM CDT	Areal Flood Advisory	LIX	Jefferson, Plaquemines, Saint Bernard	113 min
Aug 26, 3:47 PM CDT	Flash Flood Warning	LIX	Jefferson, Orleans, Saint Bernard	118 min
Aug 26, 5:33 AM CDT	Special Weather Statement	LIX	Hancock	27 min
Aug 26, 6:12 AM CDT	Special Weather Statement	LIX	Jackson	33 min
Aug 26, 6:45 AM CDT	Special Weather Statement	LIX	Harrison	45 min
Aug 26, 7:02 AM CDT	Special Weather Statement	LIX	Jackson	28 min
Aug 26, 7:14 AM CDT	Areal Flood Advisory	LIX	Harrison, Jackson	2 hr
Aug 26, 7:27 AM CDT	Special Weather Statement	LIX	Jackson	63 min
Aug 26, 7:51 AM CDT	Areal Flood Advisory	LIX	Jackson	3 hr
Aug 26, 2:02 PM CDT	Special Weather Statement	LIX	Pike, Walthall	28 min
Aug 26, 3:19 PM CDT	Special Weather Statement	LIX	Hancock	26 min
Aug 26, 5:33 PM CDT	Special Weather Statement	LIX	Amite	27 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2019 Every severe thunderstorm warning in 2019

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.