Alert archive / Texas / Mesoscale Discussions in 2015

Mesoscale Discussion 612

May 11, 201524 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 11, 2015, 2:16 PM CDT for 24 counties in Texas. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued: May 11, 2015, 2:16 PM CDT (19:16 UTC)
Expired: May 11, 2015, 4:15 PM CDT
In force: 119 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 24 counties

Atascosa County, TX, Bee County, TX, Bexar County, TX, Colorado County, TX, DeWitt County, TX, Dimmit County, TX, Duval County, TX, Frio County, TX, Goliad County, TX, Gonzales County, TX, Guadalupe County, TX, Karnes County, TX, Kinney County, TX, La Salle County, TX, Lavaca County, TX, Live Oak County, TX, Maverick County, TX, McMullen County, TX, Medina County, TX, Uvalde County, TX, Webb County, TX, Wharton County, TX, Wilson County, TX, Zavala County, TX

The radar

The Austin/San Antonio radar (KEWX), 124 km from the middle of the area, began a volume at 19:18 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

Corpus Christi, TX (KCRP), launched 12:00Z, 7.3 hours before the alert went out and 140 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: 2111 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 664 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 111 m²/s²
0-3 km storm-relative helicity: 117 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 6.2

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 10, 7:08 PM CDT	Mesoscale Discussion	SPC	Bowie, Camp, Cass, Cherokee, Franklin, Gregg and 9 more	97 min
May 10, 7:34 PM CDT	Tornado Watch	SPC	Bowie, Camp, Cass, Cherokee, Franklin, Gregg and 9 more	4 hr
May 10, 8:06 PM CDT	Mesoscale Discussion	SPC	Anderson, Fannin, Freestone, Henderson, Hunt, Kaufman and 5 more	54 min
May 10, 9:57 PM CDT	Mesoscale Discussion	SPC	Anderson, Bowie, Camp, Cass, Cherokee, Franklin and 12 more	93 min
May 10, 11:31 PM CDT	Tornado Watch	SPC	Bowie, Camp, Cass, Cherokee, Gregg, Harrison and 7 more	5 hr
May 11, 2:31 AM CDT	Mesoscale Discussion	SPC	Edwards, Kerr, Kimble, Real, Sutton, Val Verde	89 min
May 11, 2:55 AM CDT	Mesoscale Discussion	SPC	Angelina, Brazos, Burleson, Houston, Leon, Madison and 7 more	95 min
May 11, 4:19 AM CDT	Severe Thunderstorm Watch	SPC	Bandera, Bastrop, Bexar, Blanco, Burnet, Caldwell and 18 more	7 hr
May 11, 7:04 AM CDT	Mesoscale Discussion	SPC	Austin, Bandera, Bastrop, Bexar, Blanco, Burleson and 34 more	56 min

Nearby

Mesoscale Discussions in Texas, 2015 Every mesoscale discussion in 2015

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.