Alert archive / Louisiana / Mesoscale Discussions in 2014

Mesoscale Discussion 303

April 6, 20147 parishes in Louisiana

The Storm Prediction Center issued this mesoscale discussion at Apr 6, 2014, 10:40 PM CDT for 7 parishes in Louisiana. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued: Apr 6, 2014, 10:40 PM CDT (03:40 UTC)
Expired: Apr 6, 2014, 11:45 PM CDT
In force: 65 min
Issued by: the Storm Prediction Center

Counties Acadia Parish, LA, Iberia Parish, LA, Lafayette Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, St. Mary Parish, LA, Vermilion Parish, LA

The radar

The Lake Charles radar (KLCH), 125 km from the middle of the area, began a volume at 03:44 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 3.7 hours before the alert went out and 123 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: 1705 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 577 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 133 m²/s²
0-3 km storm-relative helicity: 147 m²/s²
Significant tornado parameter: 1.3
Supercell composite: 6.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 6, 7:48 PM CDT	Mesoscale Discussion	SPC	Acadia, Calcasieu, Cameron, Evangeline, Jefferson Davis, Lafayette and 2 more	87 min
Apr 6, 10:10 PM CDT	Mesoscale Discussion	SPC	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberville, Jefferson and 18 more	2 hr
Apr 6, 11:49 PM CDT	Mesoscale Discussion	SPC	Ascension, East Baton Rouge, East Feliciana, Iberville, Livingston, Saint Helena and 3 more	86 min
Apr 7, 12:50 AM CDT	Mesoscale Discussion	SPC	Ascension, Assumption, Jefferson, Lafourche, Livingston, Orleans and 9 more	25 min
Apr 7, 1:16 AM CDT	Tornado Watch	SPC	Ascension, Assumption, East Baton Rouge, East Feliciana, Jefferson, Lafourche and 12 more	7 hr
Apr 7, 3:16 AM CDT	Mesoscale Discussion	SPC	Orleans, Saint Bernard, Saint Charles, Saint James, Saint John the Baptist, Saint Tammany and 2 more	119 min
Apr 7, 5:42 AM CDT	Mesoscale Discussion	SPC	Ascension, Assumption, Jefferson, Lafourche, Livingston, Orleans and 7 more	2 hr

Nearby

Mesoscale Discussions in Louisiana, 2014 Every mesoscale discussion in 2014

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; radar from the NEXRAD Level II archive.