Alert archive / Texas / Mesoscale Discussions in 2017

Mesoscale Discussion 368

March 29, 2017Beauregard Parish, Calcasieu Parish, Cameron Parish, Louisiana; 13 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 29, 2017, 1:31 PM CDT for Beauregard Parish, Calcasieu Parish, Cameron Parish, Louisiana; 13 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Mar 29, 2017, 1:31 PM CDT (18:31 UTC)
Expired: Mar 29, 2017, 4:00 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 60%

Counties Beauregard Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, Brazoria County, TX, Chambers County, TX, Galveston County, TX, Hardin County, TX, Harris County, TX, Jasper County, TX, Jefferson County, TX, Liberty County, TX, Newton County, TX, Orange County, TX, Polk County, TX, San Jacinto County, TX, Tyler County, TX

The radar

The Houston radar (KHGX), 87 km from the middle of the area, began a volume at 18:30 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 98Mar 29, 2:10 PM CDT

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 6.5 hours before the alert went out and 110 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: 451 J/kg
Mixed-layer CIN: -384 J/kg
Mixed-layer LCL: 879 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 162 m²/s²
0-3 km storm-relative helicity: 229 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 29, 2:11 PM CDT	Tornado Watch	SPC	Allen, Beauregard, Calcasieu, Caldwell, Cameron, Grant and 7 more	7 hr
Mar 29, 5:50 PM CDT	Mesoscale Discussion	SPC	Acadia, Allen, Avoyelles, Beauregard, Bienville, Calcasieu and 27 more	115 min
Mar 28, 7:45 PM CDT	Mesoscale Discussion	SPC	Armstrong, Briscoe, Carson, Castro, Crosby, Deaf Smith and 9 more	60 min
Mar 28, 9:07 PM CDT	Mesoscale Discussion	SPC	Bandera, Bexar, Blanco, Brown, Burnet, Callahan and 37 more	23 min
Mar 28, 9:28 PM CDT	Severe Thunderstorm Watch	SPC	Atascosa, Bandera, Bell, Bexar, Blanco, Bosque and 78 more	8 hr
Mar 28, 10:21 PM CDT	Severe Thunderstorm Watch	SPC	Archer, Baylor, Clay, Wichita, Wilbarger	7 hr
Mar 28, 10:25 PM CDT	Mesoscale Discussion	SPC	Archer, Clay, Cooke, Montague, Wichita	65 min
Mar 28, 11:58 PM CDT	Mesoscale Discussion	SPC	Anderson, Bastrop, Bell, Bexar, Blanco, Bosque and 29 more	92 min
Mar 29, 2:54 AM CDT	Mesoscale Discussion	SPC	Collin, Delta, Fannin, Franklin, Grayson, Hopkins and 7 more	96 min
Mar 29, 8:23 AM CDT	Mesoscale Discussion	SPC	Brazoria, Calhoun, Chambers, Fort Bend, Galveston, Hardin and 12 more	67 min
Mar 29, 4:17 PM CDT	Tornado Watch	SPC	Bowie, Cass, Morris	8 hr

Nearby

Mesoscale Discussions in Texas, 2017 Mesoscale Discussions in Louisiana, 2017 Every mesoscale discussion in 2017

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.