Alert archive / Texas / Mesoscale Discussions in 2015

Mesoscale Discussion 677

May 16, 201535 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 16, 2015, 9:02 PM CDT for 35 counties in Texas. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued: May 16, 2015, 9:02 PM CDT (02:02 UTC)
Expired: May 16, 2015, 10:00 PM CDT
In force: 58 min
Issued by: the Storm Prediction Center

All 35 counties

Brown County, TX, Callahan County, TX, Coke County, TX, Coleman County, TX, Comanche County, TX, Concho County, TX, Cooke County, TX, Crockett County, TX, Denton County, TX, Eastland County, TX, Erath County, TX, Grayson County, TX, Haskell County, TX, Hood County, TX, Irion County, TX, Jack County, TX, Jones County, TX, McCulloch County, TX, Menard County, TX, Mills County, TX, Montague County, TX, Nolan County, TX, Palo Pinto County, TX, Parker County, TX, Runnels County, TX, Schleicher County, TX, Shackelford County, TX, Stephens County, TX, Sutton County, TX, Tarrant County, TX, Taylor County, TX, Throckmorton County, TX, Tom Green County, TX, Wise County, TX, Young County, TX

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 2.0 hours before the alert went out and 214 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: 2428 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 1267 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 143 m²/s²
0-3 km storm-relative helicity: 280 m²/s²
Significant tornado parameter: 2.6
Supercell composite: 19.4

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 16, 7:14 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Clay, Cooke, Haskell, Jack and 12 more	91 min
May 16, 9:36 PM CDT	Severe Thunderstorm Watch	SPC	Brown, Callahan, Coke, Coleman, Concho, Crockett and 15 more	6 hr
May 16, 10:40 PM CDT	Severe Thunderstorm Watch	SPC	Bosque, Collin, Comanche, Cooke, Dallas, Denton and 17 more	3 hr
May 16, 11:48 PM CDT	Mesoscale Discussion	SPC	Bosque, Brown, Callahan, Coleman, Collin, Comanche and 34 more	117 min
May 17, 1:48 AM CDT	Mesoscale Discussion	SPC	Bosque, Brown, Collin, Comanche, Dallas, Denton and 22 more	57 min
May 17, 2:25 AM CDT	Mesoscale Discussion	SPC	Edwards, Gillespie, Kerr, Kimble, Lampasas, Llano and 3 more	95 min

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.