Alert archive / Texas / Mesoscale Discussions in 2013

Mesoscale Discussion 646

May 15, 201315 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 15, 2013, 5:24 PM CDT for 15 counties in Texas. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: May 15, 2013, 5:24 PM CDT (22:24 UTC)
Expired: May 15, 2013, 8:00 PM CDT
In force: 3 hr
Issued by: the Storm Prediction Center
Chance of a watch: 60%

Counties Bandera County, TX, Blanco County, TX, Edwards County, TX, Gillespie County, TX, Kendall County, TX, Kerr County, TX, Kimble County, TX, Kinney County, TX, Llano County, TX, Mason County, TX, Menard County, TX, Real County, TX, San Saba County, TX, Sutton County, TX, Uvalde County, TX

The radar

The Laughlin AFB radar (KDFX), 106 km from the middle of the area, began a volume at 22:27 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 161May 15, 6:00 PM CDT

The nearest sounding before it

Midland Regional, TX (KMAF), launched 12:00Z, 10.4 hours before the alert went out and 300 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: 171 J/kg
Mixed-layer CIN: -333 J/kg
Mixed-layer LCL: 1267 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 223 m²/s²
0-3 km storm-relative helicity: 327 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 14, 7:55 PM CDT	Mesoscale Discussion	SPC	Bandera, Dimmit, Edwards, Frio, Kerr, Kimble and 10 more	2 hr
May 15, 2:59 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Bosque, Brown, Callahan, Clay and 40 more	91 min
May 15, 3:04 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Bosque, Brown, Callahan, Clay and 40 more	86 min
May 15, 3:28 PM CDT	Severe Thunderstorm Watch	SPC	Archer, Baylor, Brown, Callahan, Childress, Clay and 45 more	9 hr
May 15, 5:40 PM CDT	Mesoscale Discussion	SPC	Bell, Bosque, Burnet, Collin, Comanche, Cooke and 21 more	65 min
May 15, 6:01 PM CDT	Tornado Watch	SPC	Bell, Bosque, Brown, Clay, Coleman, Collin and 33 more	8 hr

Nearby

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.