Alert archive / Texas / Mesoscale Discussions in 2015

Mesoscale Discussion 515

May 6, 20159 counties in Oklahoma; 23 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 6, 2015, 1:03 PM CDT for 9 counties in Oklahoma; 23 counties in Texas. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued: May 6, 2015, 1:03 PM CDT (18:03 UTC)
Expired: May 6, 2015, 3:00 PM CDT
In force: 117 min
Issued by: the Storm Prediction Center
Chance of a watch: 95%

All 32 counties

Comanche County, OK, Cotton County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Jefferson County, OK, Kiowa County, OK, Stephens County, OK, Tillman County, OK, Archer County, TX, Baylor County, TX, Childress County, TX, Clay County, TX, Cottle County, TX, Dickens County, TX, Fisher County, TX, Foard County, TX, Hardeman County, TX, Haskell County, TX, Jack County, TX, Jones County, TX, Kent County, TX, King County, TX, Knox County, TX, Palo Pinto County, TX, Shackelford County, TX, Stephens County, TX, Stonewall County, TX, Throckmorton County, TX, Wichita County, TX, Wilbarger County, TX, Young County, TX

The radar

The Altus AFB radar (KFDR), 58 km from the middle of the area, began a volume at 18:04 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 133May 6, 1:25 PM CDT

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 6.1 hours before the alert went out and 219 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: 1226 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 562 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 219 m²/s²
0-3 km storm-relative helicity: 308 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 9.1

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 6, 1:09 PM CDT	Mesoscale Discussion	SPC	Woods	3 hr
May 6, 1:23 PM CDT	Tornado Watch	SPC	Alfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 29 more	8 hr
May 6, 3:27 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Beckham, Blaine, Caddo, Canadian, Carter and 28 more	2 hr
May 6, 5:25 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Blaine, Caddo, Canadian, Carter, Cleveland and 27 more	2 hr
May 6, 6:34 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Beckham, Blaine, Caddo, Canadian, Carter and 34 more	86 min
May 5, 7:41 PM CDT	Mesoscale Discussion	SPC	Borden, Briscoe, Childress, Cottle, Crosby, Dickens and 15 more	2 hr
May 5, 8:07 PM CDT	Tornado Watch	SPC	Coke, Cottle, Crosby, Dickens, Fisher, Foard and 14 more	4 hr
May 5, 9:56 PM CDT	Mesoscale Discussion	SPC	Borden, Callahan, Coke, Cottle, Crosby, Dickens and 23 more	94 min
May 6, 1:46 PM CDT	Mesoscale Discussion	SPC	Brown, Callahan, Coke, Coleman, Concho, Crockett and 22 more	119 min
May 6, 3:00 PM CDT	Tornado Watch	SPC	Brown, Coke, Coleman, Concho, Crockett, Fisher and 12 more	7 hr

Nearby

Mesoscale Discussions in Texas, 2015 Mesoscale Discussions in Oklahoma, 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.