Alert archive / Texas / Mesoscale Discussions in 2015

Mesoscale Discussion 550

May 8, 201514 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 8, 2015, 5:15 PM CDT for 14 counties in Texas. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued: May 8, 2015, 5:15 PM CDT (22:15 UTC)
Expired: May 8, 2015, 6:45 PM CDT
In force: 90 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Bell County, TX, Brazos County, TX, Burleson County, TX, Falls County, TX, Freestone County, TX, Grimes County, TX, Leon County, TX, Limestone County, TX, Madison County, TX, McLennan County, TX, Milam County, TX, Robertson County, TX, Walker County, TX, Williamson County, TX

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 10.3 hours before the alert went out and 205 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: 1443 J/kg
Mixed-layer CIN: -84 J/kg
Mixed-layer LCL: 613 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 224 m²/s²
0-3 km storm-relative helicity: 128 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 10.6

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 7, 8:49 PM CDT	Mesoscale Discussion	SPC	Bosque, Collin, Comanche, Dallas, Delta, Denton and 19 more	86 min
May 7, 11:05 PM CDT	Mesoscale Discussion	SPC	Bosque, Collin, Comanche, Dallas, Delta, Ellis and 17 more	85 min
May 8, 8:57 AM CDT	Mesoscale Discussion	SPC	Bailey, Briscoe, Castro, Childress, Cottle, Crosby and 18 more	93 min
May 8, 9:31 AM CDT	Tornado Watch	SPC	Andrews, Armstrong, Bailey, Borden, Briscoe, Callahan and 40 more	7 hr
May 8, 12:22 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Childress, Clay, Foard, Hardeman and 5 more	83 min
May 8, 12:51 PM CDT	Tornado Watch	SPC	Archer, Baylor, Childress, Clay, Collingsworth, Cooke and 14 more	8 hr
May 8, 2:12 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Childress, Clay, Cooke, Foard and 8 more	93 min
May 8, 2:48 PM CDT	Mesoscale Discussion	SPC	Bailey, Borden, Cottle, Crosby, Dawson, Dickens and 18 more	87 min
May 8, 3:26 PM CDT	Mesoscale Discussion	SPC	Coke, Crockett, Edwards, Glasscock, Irion, Kinney and 8 more	94 min
May 8, 3:45 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Clay, Foard, Hardeman, Knox and 3 more	90 min
May 8, 3:50 PM CDT	Tornado Watch	SPC	Andrews, Borden, Callahan, Coke, Crane, Crockett and 27 more	8 hr
May 8, 6:13 PM CDT	Mesoscale Discussion	SPC	Baylor, Borden, Callahan, Coke, Concho, Crane and 31 more	2 hr
May 8, 6:50 PM CDT	Mesoscale Discussion	SPC	Archer, Clay, Collin, Cooke, Dallas, Delta and 15 more	85 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.