Alert archive / Texas / Mesoscale Discussions in 2014

Mesoscale Discussion 220

March 28, 2014De Soto Parish, Red River Parish, Sabine Parish, Louisiana; 22 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 28, 2014, 6:53 PM CDT for De Soto Parish, Red River Parish, Sabine Parish, Louisiana; 22 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Mar 28, 2014, 6:53 PM CDT (23:53 UTC)
Expired: Mar 28, 2014, 9:00 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 25 counties

De Soto Parish, LA, Red River Parish, LA, Sabine Parish, LA, Angelina County, TX, Austin County, TX, Brazoria County, TX, Chambers County, TX, Fort Bend County, TX, Galveston County, TX, Hardin County, TX, Harris County, TX, Jasper County, TX, Jefferson County, TX, Liberty County, TX, Montgomery County, TX, Nacogdoches County, TX, Panola County, TX, Polk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Shelby County, TX, Tyler County, TX, Waller County, TX, Wharton County, TX

The radar

The Houston radar (KHGX), 116 km from the middle of the area, began a volume at 23:53 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, 11.9 hours before the alert went out and 156 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, 6:38 PM CDT	Mesoscale Discussion	SPC	Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 35 more	3 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 Texas, 2014 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.