Alert archive / Texas / Mesoscale Discussions in 2012

Mesoscale Discussion 1131

June 11, 201237 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Jun 11, 2012, 9:54 PM CDT for 37 counties in Texas. It was in force for 66 min.

The area

The outline as issued.

The facts

Issued: Jun 11, 2012, 9:54 PM CDT (02:54 UTC)
Expired: Jun 11, 2012, 11:00 PM CDT
In force: 66 min
Issued by: the Storm Prediction Center

All 37 counties

Archer County, TX, Baylor County, TX, Brown County, TX, Callahan County, TX, Clay County, TX, Coke County, TX, Coleman County, TX, Collin County, TX, Comanche County, TX, Concho County, TX, Cooke County, TX, Dallas County, TX, Denton County, TX, Eastland County, TX, Erath County, TX, Grayson County, TX, Hood County, TX, Irion County, TX, Jack County, TX, Johnson County, TX, Jones County, TX, Montague County, TX, Nolan County, TX, Palo Pinto County, TX, Parker County, TX, Rockwall County, TX, Runnels County, TX, Shackelford County, TX, Somervell County, TX, Stephens County, TX, Sterling County, TX, Tarrant County, TX, Taylor County, TX, Throckmorton County, TX, Tom Green County, TX, Wise County, TX, Young County, TX

The radar

The Dyess AFB radar (KDYX), 46 km from the middle of the area, began a volume at 02:54 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.

Severe Thunderstorm Watch 378Jun 11, 11:55 PM CDT

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 2.9 hours before the alert went out and 142 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: 3358 J/kg
Mixed-layer CIN: -179 J/kg
Mixed-layer LCL: 1743 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 92 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.5

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
Jun 11, 7:11 PM CDT	Mesoscale Discussion	SPC	Brown, Callahan, Clay, Coke, Coleman, Collin and 29 more	94 min
Jun 11, 11:29 PM CDT	Mesoscale Discussion	SPC	Grayson	61 min
Jun 11, 11:52 PM CDT	Severe Thunderstorm Watch	SPC	Bowie, Camp, Cass, Collin, Delta, Fannin and 14 more	6 hr
Jun 12, 2:54 AM CDT	Mesoscale Discussion	SPC	Bowie, Camp, Cass, Gregg, Harrison, Marion and 3 more	96 min
Jun 12, 3:21 AM CDT	Severe Thunderstorm Watch	SPC	Bowie, Cass, Gregg, Harrison, Marion, Morris and 8 more	8 hr
Jun 12, 4:08 AM CDT	Mesoscale Discussion	SPC	Armstrong, Bailey, Briscoe, Castro, Childress, Deaf Smith and 9 more	2 hr
Jun 12, 6:08 AM CDT	Mesoscale Discussion	SPC	Nacogdoches, Panola, Shelby	2 hr
Jun 12, 7:11 AM CDT	Severe Thunderstorm Watch	SPC	Hardin, Jasper, Jefferson, Newton, Orange, Tyler	8 hr
Jun 12, 9:23 AM CDT	Mesoscale Discussion	SPC	Nacogdoches, Sabine, San Augustine, Shelby	67 min
Jun 12, 10:32 AM CDT	Mesoscale Discussion	SPC	Archer, Clay, Collin, Cooke, Dallas, Denton and 19 more	88 min
Jun 12, 11:00 AM CDT	Severe Thunderstorm Watch	SPC	Anderson, Bell, Bosque, Brown, Callahan, Collin and 36 more	6 hr
Jun 12, 12:12 PM CDT	Mesoscale Discussion	SPC	Chambers, Hardin, Jasper, Jefferson, Newton, Orange and 1 more	63 min
Jun 12, 2:02 PM CDT	Mesoscale Discussion	SPC	Dallam, Deaf Smith, Hartley, Oldham	88 min
Jun 12, 2:16 PM CDT	Severe Thunderstorm Watch	SPC	Dallam, Deaf Smith, Hartley, Oldham	8 hr
Jun 12, 2:45 PM CDT	Mesoscale Discussion	SPC	Coke, Coleman, Concho, Glasscock, Midland, Mitchell and 4 more	60 min
Jun 12, 3:00 PM CDT	Mesoscale Discussion	SPC	Andrews, Bailey, Cochran, Crane, Ector, Gaines and 7 more	60 min
Jun 12, 3:28 PM CDT	Mesoscale Discussion	SPC	Anderson, Bell, Bosque, Brazos, Brown, Burleson and 37 more	62 min
Jun 12, 3:44 PM CDT	Severe Thunderstorm Watch	SPC	Andrews, Bailey, Cochran, Crane, Culberson, Ector and 13 more	8 hr
Jun 12, 3:56 PM CDT	Severe Thunderstorm Watch	SPC	Anderson, Austin, Bell, Brazoria, Brazos, Burleson and 24 more	4 hr
Jun 12, 5:42 PM CDT	Mesoscale Discussion	SPC	Dallam	63 min

Nearby

Mesoscale Discussions in Texas, 2012 Every mesoscale discussion in 2012

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.