Alert archive / Texas / Mesoscale Discussions in 2013

Mesoscale Discussion 615

May 9, 20134 parishes in Louisiana; 16 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 9, 2013, 6:40 PM CDT for 4 parishes in Louisiana; 16 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 9, 2013, 6:40 PM CDT (23:40 UTC)
Expired: May 9, 2013, 8:45 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Beauregard Parish, LA, De Soto Parish, LA, Sabine Parish, LA, Vernon Parish, LA, Angelina County, TX, Cherokee County, TX, Hardin County, TX, Jasper County, TX, Liberty County, TX, Montgomery County, TX, Nacogdoches County, TX, Newton County, TX, Panola County, TX, Polk County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Shelby County, TX, Tyler County, TX

The watches that followed

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

Severe Thunderstorm Watch 153May 9, 9:35 PM CDT

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 11.7 hours before the alert went out and 167 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: 879 J/kg
Mixed-layer CIN: -201 J/kg
Mixed-layer LCL: 550 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 141 m²/s²
0-3 km storm-relative helicity: 192 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

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 9, 2:52 PM CDT	Mesoscale Discussion	SPC	Beauregard, Calcasieu	53 min
May 9, 3:34 PM CDT	Severe Thunderstorm Watch	SPC	Beauregard, Calcasieu, Cameron, De Soto, Sabine, Vernon	6 hr
May 9, 6:39 AM CDT	Mesoscale Discussion	SPC	Bosque, Brown, Callahan, Coleman, Comanche, Concho and 13 more	3 hr
May 9, 9:37 AM CDT	Mesoscale Discussion	SPC	Bell, Bosque, Brown, Burnet, Coleman, Comanche and 15 more	113 min
May 9, 11:52 AM CDT	Severe Thunderstorm Watch	SPC	Anderson, Bell, Bosque, Brown, Burnet, Callahan and 44 more	9 hr
May 9, 3:19 PM CDT	Mesoscale Discussion	SPC	Anderson, Bell, Bosque, Brown, Burnet, Callahan and 42 more	56 min
May 9, 5:38 PM CDT	Mesoscale Discussion	SPC	Briscoe, Childress, Collingsworth, Cottle, Crosby, Donley and 4 more	67 min
May 9, 6:12 PM CDT	Mesoscale Discussion	SPC	Anderson, Atascosa, Bandera, Bexar, Blanco, Brown and 47 more	63 min

Nearby

Mesoscale Discussions in Texas, 2013 Mesoscale Discussions in Louisiana, 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.