Alert archive / Texas / Mesoscale Discussions in 2015

Mesoscale Discussion 1961

November 17, 201527 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Nov 17, 2015, 2:17 AM CST for 27 counties in Texas. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued: Nov 17, 2015, 2:17 AM CST (08:17 UTC)
Expired: Nov 17, 2015, 4:15 AM CST
In force: 118 min
Issued by: the Storm Prediction Center

All 27 counties

Bosque County, TX, Brown County, TX, Collin County, TX, Comanche County, TX, Cooke County, TX, Coryell County, TX, Dallas County, TX, Denton County, TX, Ellis County, TX, Erath County, TX, Grayson County, TX, Hamilton County, TX, Hill County, TX, Hood County, TX, Jack County, TX, Johnson County, TX, Lampasas County, TX, McCulloch County, TX, McLennan County, TX, Mills County, TX, Montague County, TX, Palo Pinto County, TX, Parker County, TX, San Saba County, TX, Somervell County, TX, Tarrant County, TX, Wise County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 99 km from the middle of the area, began a volume at 08:18 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

Fort Worth, TX (KFWD), launched 00:00Z, 8.3 hours before the alert went out and 120 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: 683 J/kg
Mixed-layer CIN: -156 J/kg
Mixed-layer LCL: 712 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 444 m²/s²
0-3 km storm-relative helicity: 505 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 4.2

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
Nov 16, 6:10 PM CST	Tornado Watch	SPC	Andrews, Borden, Coke, Crane, Crockett, Dawson and 22 more	8 hr
Nov 16, 8:07 PM CST	Mesoscale Discussion	SPC	Armstrong, Borden, Briscoe, Carson, Castro, Childress and 38 more	83 min
Nov 16, 8:16 PM CST	Mesoscale Discussion	SPC	Andrews, Borden, Coke, Crane, Crockett, Dawson and 26 more	89 min
Nov 16, 8:17 PM CST	Tornado Watch	SPC	Archer, Armstrong, Baylor, Briscoe, Carson, Childress and 31 more	7 hr
Nov 16, 10:19 PM CST	Mesoscale Discussion	SPC	Archer, Baylor, Callahan, Clay, Coke, Coleman and 16 more	86 min
Nov 16, 10:45 PM CST	Tornado Watch	SPC	Bosque, Brown, Callahan, Coleman, Collin, Comanche and 33 more	7 hr
Nov 17, 12:58 AM CST	Mesoscale Discussion	SPC	Archer, Clay, Cooke, Montague, Wichita	2 hr
Nov 17, 4:18 AM CST	Mesoscale Discussion	SPC	Anderson, Bell, Bosque, Bowie, Brazos, Camp and 39 more	57 min
Nov 17, 4:48 AM CST	Tornado Watch	SPC	Anderson, Angelina, Bell, Bowie, Brazos, Camp and 39 more	4 hr
Nov 17, 8:24 AM CST	Mesoscale Discussion	SPC	Angelina, Gregg, Hardin, Harrison, Jasper, Marion and 10 more	66 min
Nov 17, 8:55 AM CST	Tornado Watch	SPC	Angelina, Bowie, Cass, Chambers, Fort Bend, Hardin and 21 more	7 hr
Nov 17, 12:19 PM CST	Mesoscale Discussion	SPC	Hardin, Jasper, Jefferson, Newton, Orange, Sabine	116 min
Nov 17, 3:43 PM CST	Mesoscale Discussion	SPC	Dallam, Sherman	4 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.