Alert archive / Texas / Mesoscale Discussions in 2015

Mesoscale Discussion 682

May 17, 201528 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 17, 2015, 1:48 AM CDT for 28 counties in Texas. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued: May 17, 2015, 1:48 AM CDT (06:48 UTC)
Expired: May 17, 2015, 2:45 AM CDT
In force: 57 min
Issued by: the Storm Prediction Center

All 28 counties

Bosque County, TX, Brown County, TX, Collin County, TX, Comanche County, TX, Dallas County, TX, Denton County, TX, Ellis County, TX, Erath County, TX, Fannin County, TX, Freestone County, TX, Grayson County, TX, Hamilton County, TX, Henderson County, TX, Hill County, TX, Hood County, TX, Hopkins County, TX, Hunt County, TX, Johnson County, TX, Kaufman County, TX, Limestone County, TX, McLennan County, TX, Navarro County, TX, Parker County, TX, Rains County, TX, Rockwall County, TX, Somervell County, TX, Tarrant County, TX, Van Zandt County, TX

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 6.8 hours before the alert went out and 31 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, 9:02 PM CDT	Mesoscale Discussion	SPC	Brown, Callahan, Coke, Coleman, Comanche, Concho and 29 more	58 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, 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.