Alert archive / Texas / Mesoscale Discussions in 2015

Mesoscale Discussion 768

May 25, 201515 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 25, 2015, 3:19 PM CDT for 15 counties in Texas. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued: May 25, 2015, 3:19 PM CDT (20:19 UTC)
Expired: May 25, 2015, 4:15 PM CDT
In force: 56 min
Issued by: the Storm Prediction Center

Counties Atascosa County, TX, Bandera County, TX, Bexar County, TX, Dimmit County, TX, Edwards County, TX, Frio County, TX, Karnes County, TX, Kerr County, TX, Kinney County, TX, Maverick County, TX, Medina County, TX, Real County, TX, Uvalde County, TX, Wilson County, TX, Zavala County, TX

The radar

The Laughlin AFB radar (KDFX), 98 km from the middle of the area, began a volume at 20:22 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 216May 25, 6:20 PM CDT

The nearest sounding before it

Del Rio, TX (KDRT), launched 12:00Z, 8.3 hours before the alert went out and 150 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: 2864 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 649 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 145 m²/s²
0-3 km storm-relative helicity: 277 m²/s²
Significant tornado parameter: 4.5
Supercell composite: 17.2

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 24, 7:57 PM CDT	Mesoscale Discussion	SPC	Hemphill, Lipscomb, Ochiltree, Roberts	93 min
May 24, 8:24 PM CDT	Tornado Watch	SPC	Hansford, Lipscomb, Ochiltree	5 hr
May 25, 3:17 AM CDT	Mesoscale Discussion	SPC	Bandera, Coke, Crane, Crockett, Ector, Edwards and 21 more	4 hr
May 25, 6:45 AM CDT	Severe Thunderstorm Watch	SPC	Andrews, Borden, Brown, Callahan, Coke, Coleman and 34 more	6 hr
May 25, 6:50 AM CDT	Mesoscale Discussion	SPC	Andrews, Borden, Callahan, Coke, Coleman, Crosby and 26 more	55 min
May 25, 7:53 AM CDT	Mesoscale Discussion	SPC	Bandera, Bexar, Blanco, Burnet, Comal, Frio and 8 more	2 hr
May 25, 9:02 AM CDT	Tornado Watch	SPC	Atascosa, Bandera, Bastrop, Bexar, Blanco, Burnet and 27 more	7 hr
May 25, 10:13 AM CDT	Mesoscale Discussion	SPC	Anderson, Archer, Baylor, Bell, Bosque, Brown and 69 more	2 hr
May 25, 10:54 AM CDT	Tornado Watch	SPC	Archer, Baylor, Bell, Bosque, Brown, Callahan and 55 more	7 hr
May 25, 11:37 AM CDT	Mesoscale Discussion	SPC	Atascosa, Bandera, Bastrop, Bexar, Blanco, Burnet and 26 more	113 min
May 25, 1:54 PM CDT	Mesoscale Discussion	SPC	Bell, Bosque, Clay, Collin, Cooke, Coryell and 26 more	2 hr
May 25, 2:10 PM CDT	Mesoscale Discussion	SPC	Austin, Bastrop, Bexar, Blanco, Brazos, Burleson and 26 more	95 min
May 25, 2:35 PM CDT	Mesoscale Discussion	SPC	Anderson, Austin, Bowie, Brazos, Burleson, Camp and 34 more	55 min
May 25, 2:52 PM CDT	Tornado Watch	SPC	Anderson, Angelina, Bastrop, Blanco, Bowie, Brazos and 53 more	8 hr
May 25, 5:15 PM CDT	Mesoscale Discussion	SPC	Bowie, Camp, Cass, Gregg, Harrison, Marion and 7 more	90 min
May 25, 5:51 PM CDT	Tornado Watch	SPC	Sabine	6 hr
May 25, 6:06 PM CDT	Mesoscale Discussion	SPC	Austin, Brazoria, Chambers, Colorado, Fort Bend, Galveston and 14 more	54 min
May 25, 6:24 PM CDT	Tornado Watch	SPC	Austin, Bee, Brazoria, Calhoun, Chambers, Colorado and 18 more	9 hr

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.