Alert archive / Texas / Mesoscale Discussions in 2016

Mesoscale Discussion 406

April 17, 201614 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 17, 2016, 2:47 PM CDT for 14 counties in Texas. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued: Apr 17, 2016, 2:47 PM CDT (19:47 UTC)
Expired: Apr 17, 2016, 4:15 PM CDT
In force: 88 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Atascosa County, TX, Bandera County, TX, Bexar County, TX, Blanco County, TX, Caldwell County, TX, Comal County, TX, Frio County, TX, Guadalupe County, TX, Hays County, TX, Kendall County, TX, Medina County, TX, Travis County, TX, Williamson County, TX, Wilson County, TX

The radar

The Austin/San Antonio radar (KEWX), 42 km from the middle of the area, began a volume at 19:46 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

Del Rio, TX (KDLF), launched 12:00Z, 7.8 hours before the alert went out and 234 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: 595 J/kg
Mixed-layer CIN: -88 J/kg
Mixed-layer LCL: 625 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 331 m²/s²
0-3 km storm-relative helicity: 477 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 11.7

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 16, 7:07 PM CDT	Severe Thunderstorm Watch	SPC	Archer, Baylor, Clay, Foard, Hardeman, Knox and 2 more	7 hr
Apr 16, 7:42 PM CDT	Mesoscale Discussion	SPC	Borden, Coke, Concho, Crockett, Fisher, Glasscock and 18 more	93 min
Apr 16, 8:27 PM CDT	Mesoscale Discussion	SPC	Armstrong, Briscoe, Carson, Childress, Collingsworth, Cottle and 16 more	63 min
Apr 16, 10:43 PM CDT	Mesoscale Discussion	SPC	Brown, Callahan, Coke, Coleman, Comanche, Concho and 20 more	92 min
Apr 16, 10:48 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Clay, Foard, Hardeman, Knox and 2 more	117 min
Apr 16, 11:51 PM CDT	Severe Thunderstorm Watch	SPC	Brown, Callahan, Coke, Coleman, Comanche, Concho and 27 more	7 hr
Apr 17, 1:47 AM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Clay, Foard, Hardeman, Knox and 2 more	58 min
Apr 17, 2:01 AM CDT	Mesoscale Discussion	SPC	Brown, Callahan, Coleman, Comanche, Concho, Eastland and 17 more	59 min
Apr 17, 7:48 AM CDT	Mesoscale Discussion	SPC	Bell, Bosque, Burnet, Coryell, Falls, Hamilton and 3 more	87 min
Apr 17, 5:25 PM CDT	Mesoscale Discussion	SPC	Bandera, Bexar, Blanco, Frio, Gillespie, Kendall and 1 more	2 hr

Nearby

Mesoscale Discussions in Texas, 2016 Every mesoscale discussion in 2016

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.