Alert archive / Louisiana / Mesoscale Discussions in 2014

Mesoscale Discussion 725

May 27, 201416 parishes in Louisiana; 5 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 27, 2014, 9:19 AM CDT for 16 parishes in Louisiana; 5 counties in Texas. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued: May 27, 2014, 9:19 AM CDT (14:19 UTC)
Expired: May 27, 2014, 10:15 AM CDT
In force: 56 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 21 counties

Acadia Parish, LA, Allen Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, Evangeline Parish, LA, Grant Parish, LA, Iberia Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, Natchitoches Parish, LA, Rapides Parish, LA, Sabine Parish, LA, Saint Landry Parish, LA, Vermilion Parish, LA, Vernon Parish, LA, Jasper County, TX, Jefferson County, TX, Newton County, TX, Orange County, TX, Sabine County, TX

The radar

The Lake Charles radar (KLCH), 12 km from the middle of the area, began a volume at 14:21 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 12:00Z, 2.3 hours before the alert went out and 14 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: 1383 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 569 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 76 m²/s²
0-3 km storm-relative helicity: 156 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.6

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
May 26, 7:38 PM CDT	Mesoscale Discussion	SPC	Comanche, Eastland, Erath, Hamilton, Jack, Lampasas and 4 more	67 min
May 26, 8:04 PM CDT	Mesoscale Discussion	SPC	Borden, Coke, Crane, Crockett, Dickens, Edwards and 19 more	86 min
May 26, 10:21 PM CDT	Mesoscale Discussion	SPC	Brown, Coleman, Concho, Irion, McCulloch, Reagan and 2 more	54 min
May 26, 11:45 PM CDT	Mesoscale Discussion	SPC	Starr	60 min
May 27, 2:17 AM CDT	Mesoscale Discussion	SPC	Atascosa, Bandera, Bexar, Blanco, Caldwell, Comal and 9 more	2 hr
May 27, 3:03 PM CDT	Mesoscale Discussion	SPC	Bosque, Brown, Callahan, Coleman, Collin, Comanche and 30 more	117 min
May 27, 3:13 PM CDT	Mesoscale Discussion	SPC	Aransas, Atascosa, Bee, Duval, Frio, Goliad and 10 more	62 min
May 27, 3:18 PM CDT	Severe Thunderstorm Watch	SPC	Bell, Bosque, Brown, Burnet, Callahan, Coleman and 45 more	6 hr
May 27, 3:40 PM CDT	Tornado Watch	SPC	Aransas, Atascosa, Bandera, Bee, Bexar, Blanco and 24 more	6 hr
May 27, 5:30 PM CDT	Mesoscale Discussion	SPC	Aransas, Atascosa, Bee, Duval, Frio, Goliad and 10 more	90 min
May 27, 6:00 PM CDT	Mesoscale Discussion	SPC	Bell, Bosque, Coryell, Ellis, Falls, Hamilton and 8 more	90 min
May 27, 6:27 PM CDT	Mesoscale Discussion	SPC	Kenedy, Willacy	93 min
May 27, 6:40 PM CDT	Tornado Watch	SPC	Brooks, Kenedy, Willacy	2 hr

Nearby

Mesoscale Discussions in Louisiana, 2014 Mesoscale Discussions in Texas, 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.