Alert archive / Louisiana / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 60, NWS New Orleans, LA

June 4, 2018Ascension Parish, Livingston Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Jun 4, 2018, 6:41 PM CDT for Ascension Parish, Livingston Parish, Louisiana. It was in force for 34 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: Jun 4, 2018, 6:41 PM CDT (23:41 UTC)
Expired: Jun 4, 2018, 7:15 PM CDT
In force: 34 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Ascension Parish, LA, Livingston Parish, LA

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 11.7 hours before the alert went out and 230 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: 1674 J/kg
Mixed-layer CIN: -45 J/kg
Mixed-layer LCL: 913 m above ground
0-6 km bulk shear: 3 kt
0-1 km storm-relative helicity: -18 m²/s²
0-3 km storm-relative helicity: 18 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 Jun 4, 4:08 PM CDT, 2 hours 33 minutes earlier.

Area forecast discussion, Jun 4, 4:08 PM CDT, 2 hours 33 minutes before

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Hazardous weather outlook, Jun 4, 4:20 PM CDT, 2 hours 21 minutes before

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In the hours before

Special weather statement, Jun 4, 4:04 PM CDT, 2 hours 37 minutes before

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Special weather statement, Jun 4, 4:43 PM CDT, 1 hour 58 minutes before

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Special weather statement, Jun 4, 4:47 PM CDT, 1 hour 54 minutes before

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Special weather statement, Jun 4, 5:19 PM CDT, 1 hour 22 minutes before

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Special weather statement, Jun 4, 5:47 PM CDT, 54 minutes before

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Special weather statement, Jun 4, 6:20 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
Jun 3, 10:03 PM CDT	Special Marine Warning	LIX		42 min
Jun 3, 10:40 PM CDT	Special Marine Warning	LIX		50 min
Jun 3, 11:04 PM CDT	Special Marine Warning	LIX		56 min
Jun 4, 12:17 AM CDT	Special Marine Warning	LIX		58 min
Jun 4, 12:26 AM CDT	Special Marine Warning	LIX		64 min
Jun 4, 1:30 AM CDT	Special Marine Warning	LIX		30 min
Jun 4, 3:18 PM CDT	Special Weather Statement	LIX	Lafourche	42 min
Jun 4, 3:45 PM CDT	Areal Flood Advisory	LIX	Lafourche	2 hr
Jun 4, 3:59 PM CDT	Special Weather Statement	LIX	Lafourche	46 min
Jun 4, 4:04 PM CDT	Special Weather Statement	LIX	Saint Charles	41 min
Jun 4, 4:43 PM CDT	Special Weather Statement	LIX	Saint Charles	62 min
Jun 4, 4:47 PM CDT	Special Weather Statement	LIX	Saint James	58 min
Jun 4, 5:19 PM CDT	Special Weather Statement	LIX	Saint James	41 min
Jun 4, 5:47 PM CDT	Special Weather Statement	LIX	Saint James	43 min
Jun 4, 6:20 PM CDT	Special Weather Statement	LIX	Ascension	40 min
Jun 3, 10:07 PM CDT	Special Weather Statement	LIX	Jackson	23 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2018 Every severe thunderstorm warning in 2018

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.