Alert archive / Texas / Mesoscale Discussions in 2012

Mesoscale Discussion 1138

June 12, 20127 counties in Oklahoma; 25 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Jun 12, 2012, 10:32 AM CDT for 7 counties in Oklahoma; 25 counties in Texas. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued: Jun 12, 2012, 10:32 AM CDT (15:32 UTC)
Expired: Jun 12, 2012, 12:00 PM CDT
In force: 88 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 32 counties

Carter County, OK, Cotton County, OK, Jefferson County, OK, Love County, OK, Marshall County, OK, Murray County, OK, Stephens County, OK, Archer County, TX, Clay County, TX, Collin County, TX, Cooke County, TX, Dallas County, TX, Denton County, TX, Ellis County, TX, Fannin County, TX, Grayson County, TX, Hood County, TX, Hunt County, TX, Jack County, TX, Johnson County, TX, Kaufman County, TX, Montague County, TX, Palo Pinto County, TX, Parker County, TX, Rockwall County, TX, Shackelford County, TX, Stephens County, TX, Tarrant County, TX, Throckmorton County, TX, Wichita County, TX, Wise County, TX, Young County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 95 km from the middle of the area, began a volume at 15:34 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 381Jun 12, 11:00 AM CDT

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 3.5 hours before the alert went out and 68 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: 332 J/kg
Mixed-layer CIN: -471 J/kg
Mixed-layer LCL: 1574 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: -66 m²/s²
0-3 km storm-relative helicity: 99 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
Jun 11, 7:38 PM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Carter, Choctaw, Coal, Haskell and 13 more	67 min
Jun 11, 9:25 PM CDT	Severe Thunderstorm Watch	SPC	Atoka, Bryan, Carter, Choctaw, Coal, Haskell and 10 more	7 hr
Jun 11, 11:29 PM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Choctaw, Coal, Haskell, Johnston and 8 more	61 min
Jun 11, 11:52 PM CDT	Severe Thunderstorm Watch	SPC	McCurtain	6 hr
Jun 12, 2:02 PM CDT	Mesoscale Discussion	SPC	Cimarron	88 min
Jun 12, 2:16 PM CDT	Severe Thunderstorm Watch	SPC	Cimarron	8 hr
Jun 12, 5:42 PM CDT	Mesoscale Discussion	SPC	Cimarron	63 min
Jun 11, 7:11 PM CDT	Mesoscale Discussion	SPC	Brown, Callahan, Clay, Coke, Coleman, Collin and 29 more	94 min
Jun 11, 9:54 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Brown, Callahan, Clay, Coke and 31 more	66 min
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, 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, 2:45 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

Nearby

Mesoscale Discussions in Texas, 2012 Mesoscale Discussions in Oklahoma, 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.