Alert archive / Texas / Mesoscale Discussions in 2016

Mesoscale Discussion 1288

July 15, 201610 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Jul 15, 2016, 7:38 AM CDT for 10 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jul 15, 2016, 7:38 AM CDT (12:38 UTC)
Expired: Jul 15, 2016, 9:45 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Collin County, TX, Dallas County, TX, Denton County, TX, Hunt County, TX, Kaufman County, TX, Rains County, TX, Rockwall County, TX, Tarrant County, TX, Van Zandt County, TX, Wise County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 74 km from the middle of the area, began a volume at 12:40 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

Fort Worth, TX (KFWD), launched 12:00Z, 0.6 hours before the alert went out and 61 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: 1631 J/kg
Mixed-layer CIN: -118 J/kg
Mixed-layer LCL: 956 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 64 m²/s²
0-3 km storm-relative helicity: 14 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.8

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 14, 8:43 PM CDT	Mesoscale Discussion	SPC	Baylor, Brown, Callahan, Coke, Coleman, Comanche and 24 more	2 hr
Jul 14, 10:00 PM CDT	Mesoscale Discussion	SPC	Armstrong, Briscoe, Carson, Childress, Clay, Collingsworth and 10 more	2 hr
Jul 15, 3:01 PM CDT	Mesoscale Discussion	SPC	Armstrong, Bailey, Carson, Castro, Dallam, Deaf Smith and 12 more	89 min
Jul 15, 5:16 PM CDT	Mesoscale Discussion	SPC	Collingsworth, Gray, Hansford, Hemphill, Hutchinson, Lipscomb and 3 more	119 min
Jul 15, 6:46 PM CDT	Severe Thunderstorm Watch	SPC	Armstrong, Bailey, Briscoe, Carson, Castro, Childress and 23 more	6 hr

Nearby

Mesoscale Discussions in Texas, 2016 Every mesoscale discussion in 2016

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.