Alert archive / Louisiana / Mesoscale Discussions in 2014

Mesoscale Discussion 219

March 28, 201441 parishes in Louisiana; 6 counties in Mississippi; Newton County, Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 28, 2014, 6:38 PM CDT for 41 parishes in Louisiana; 6 counties in Mississippi; Newton County, Texas. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Mar 28, 2014, 6:38 PM CDT (23:38 UTC)
Expired: Mar 28, 2014, 9:15 PM CDT
In force: 3 hr
Issued by: the Storm Prediction Center
Chance of a watch: 80%

All 48 counties

Acadia Parish, LA, Allen Parish, LA, Ascension Parish, LA, Assumption Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Caldwell Parish, LA, Cameron Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Franklin Parish, LA, Grant Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jackson Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, LaSalle Parish, LA, Livingston Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Red River Parish, LA, Richland Parish, LA, Sabine Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, St. Mary Parish, LA, Tensas Parish, LA, Vermilion Parish, LA, Vernon Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Winn Parish, LA, Adams County, MS, Amite County, MS, Claiborne County, MS, Franklin County, MS, Jefferson County, MS, Wilkinson County, MS, Newton County, TX

The radar

The Ft Polk radar (KPOE), 92 km from the middle of the area, began a volume at 23:40 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Tornado Watch 41Mar 28, 7:35 PM CDT

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 11.6 hours before the alert went out and 120 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: 2173 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 444 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 167 m²/s²
0-3 km storm-relative helicity: 160 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.9

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
Mar 28, 12:45 PM CDT	Mesoscale Discussion	SPC	Bossier, Claiborne, Lincoln, Morehouse, Union, Webster	2 hr
Mar 28, 2:35 PM CDT	Severe Thunderstorm Watch	SPC	Bienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 14 more	7 hr
Mar 28, 3:11 PM CDT	Mesoscale Discussion	SPC	Bossier, Caddo, De Soto, Red River, Sabine, Webster	94 min
Mar 28, 6:53 PM CDT	Mesoscale Discussion	SPC	De Soto, Red River, Sabine	2 hr
Mar 28, 5:43 PM CDT	Mesoscale Discussion	SPC	Alcorn, Benton, Bolivar, Calhoun, Carroll, Chickasaw and 26 more	2 hr
Mar 28, 6:22 PM CDT	Severe Thunderstorm Watch	SPC	Alcorn, Benton, Calhoun, Chickasaw, Coahoma, DeSoto and 16 more	5 hr
Mar 28, 12:35 PM CDT	Mesoscale Discussion	SPC	Anderson, Bell, Blanco, Bosque, Brazos, Burleson and 48 more	115 min
Mar 28, 12:47 PM CDT	Severe Thunderstorm Watch	SPC	Anderson, Bastrop, Bell, Blanco, Bosque, Burnet and 50 more	6 hr
Mar 28, 3:57 PM CDT	Severe Thunderstorm Watch	SPC	Brazos, Burleson, Grimes, Hardin, Houston, Jasper and 10 more	6 hr
Mar 28, 5:19 PM CDT	Severe Thunderstorm Watch	SPC	Austin, Brazoria, Chambers, Colorado, Fort Bend, Galveston and 5 more	5 hr

Nearby

Mesoscale Discussions in Louisiana, 2014 Mesoscale Discussions in Mississippi, 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.