Alert archive / Louisiana / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 121, NWS New Orleans, LA

July 29, 2015Plaquemines Parish, Saint Bernard Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Jul 29, 2015, 6:51 PM CDT for Plaquemines Parish, Saint Bernard Parish, 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: Jul 29, 2015, 6:51 PM CDT (23:51 UTC)
Expired: Jul 29, 2015, 7:15 PM CDT
In force: 24 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon

Counties Plaquemines Parish, LA, Saint Bernard Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 11.9 hours before the alert went out and 61 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: 1183 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 1061 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 63 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 Jul 29, 3:43 PM CDT, 3 hours 8 minutes earlier.

Area forecast discussion, Jul 29, 3:43 PM CDT, 3 hours 8 minutes before

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Hazardous weather outlook, Jul 29, 10:03 AM CDT, 8 hours 48 minutes before

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In the hours before

Special weather statement, Jul 29, 4:42 PM CDT, 2 hours 9 minutes before

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Special weather statement, Jul 29, 4:46 PM CDT, 2 hours 5 minutes before

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Special weather statement, Jul 29, 5:22 PM CDT, 1 hour 29 minutes before

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Special weather statement, Jul 29, 5:26 PM CDT, 1 hour 25 minutes before

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Special weather statement, Jul 29, 5:53 PM CDT, 58 minutes before

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Special weather statement, Jul 29, 6:30 PM CDT, 21 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
Jul 29, 4:37 PM CDT	Special Marine Warning	LIX		53 min
Jul 29, 4:46 PM CDT	Special Weather Statement	LIX	Ascension	29 min
Jul 29, 5:26 PM CDT	Special Weather Statement	LIX	Saint Tammany	34 min
Jul 29, 5:53 PM CDT	Special Weather Statement	LIX	Saint Tammany	37 min
Jul 29, 6:06 PM CDT	Special Marine Warning	LIX		24 min
Jul 29, 6:14 PM CDT	Severe Thunderstorm Warning	LIX	Orleans, Saint Bernard, Saint John the Baptist, Saint Tammany, Tangipahoa	46 min
Jul 29, 6:30 PM CDT	Special Weather Statement	LIX	Orleans	45 min
Jul 29, 6:32 PM CDT	Special Marine Warning	LIX		43 min
Jul 29, 6:45 PM CDT	Areal Flood Advisory	LIX	Jefferson, Orleans, Plaquemines, Saint Bernard	2 hr
Jul 29, 6:56 PM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Orleans, Plaquemines, Saint Bernard, Saint Charles	34 min
Jul 29, 1:56 PM CDT	Special Weather Statement	LIX	Jackson	49 min
Jul 29, 3:36 PM CDT	Special Weather Statement	LIX	Harrison	69 min
Jul 29, 4:42 PM CDT	Special Weather Statement	LIX	Harrison	33 min
Jul 29, 5:22 PM CDT	Special Weather Statement	LIX	Hancock	38 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2015 Every severe thunderstorm warning in 2015

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.