Alert archive / Louisiana / Mesoscale Discussions in 2013

Mesoscale Discussion 655

May 16, 20134 counties in Arkansas; 12 parishes in Louisiana; Harrison County, Marion County, Texas

The Storm Prediction Center issued this mesoscale discussion at May 16, 2013, 12:07 PM CDT for 4 counties in Arkansas; 12 parishes in Louisiana; Harrison County, Marion County, Texas. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued: May 16, 2013, 12:07 PM CDT (17:07 UTC)
Expired: May 16, 2013, 1:30 PM CDT
In force: 83 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

Counties Bradley County, AR, Columbia County, AR, Lafayette County, AR, Union County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Jackson Parish, LA, Lincoln Parish, LA, Morehouse Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Union Parish, LA, Webster Parish, LA, Harrison County, TX, Marion County, TX

The radar

The Shreveport radar (KSHV), 58 km from the middle of the area, began a volume at 17:07 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 164May 16, 2:50 PM CDT

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 5.1 hours before the alert went out and 50 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: 186 J/kg
Mixed-layer CIN: -239 J/kg
Mixed-layer LCL: 717 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 105 m²/s²
0-3 km storm-relative helicity: 406 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 16, 2:54 PM CDT	Tornado Watch	SPC	Bienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 11 more	5 hr
May 16, 5:38 PM CDT	Mesoscale Discussion	SPC	Avoyelles, Bienville, Caldwell, Catahoula, Concordia, Grant and 5 more	97 min
May 15, 7:18 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Callahan, Childress, Cottle, Dickens and 19 more	57 min
May 15, 7:40 PM CDT	Mesoscale Discussion	SPC	Bosque, Brown, Collin, Comanche, Cooke, Coryell and 13 more	65 min
May 15, 9:02 PM CDT	Mesoscale Discussion	SPC	Anderson, Bell, Bosque, Brazos, Brown, Burleson and 45 more	88 min
May 15, 11:28 PM CDT	Severe Thunderstorm Watch	SPC	Anderson, Bastrop, Blanco, Brazos, Burleson, Burnet and 23 more	5 hr
May 15, 11:39 PM CDT	Mesoscale Discussion	SPC	Bell, Bosque, Coryell, Dallas, Ellis, Hamilton and 11 more	96 min
May 16, 1:26 AM CDT	Mesoscale Discussion	SPC	Anderson, Angelina, Bell, Brazos, Burleson, Burnet and 21 more	94 min
May 16, 3:21 AM CDT	Mesoscale Discussion	SPC	Brazos, Burleson, Grimes, Lee, Madison, Milam and 1 more	24 min
May 16, 3:48 PM CDT	Mesoscale Discussion	SPC	Armstrong, Bailey, Borden, Briscoe, Carson, Castro and 27 more	87 min

Nearby

Mesoscale Discussions in Louisiana, 2013 Mesoscale Discussions in Arkansas, 2013 Mesoscale Discussions in Texas, 2013 Every mesoscale discussion in 2013

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.