Alert archive / Texas / Mesoscale Discussions in 2014

Mesoscale Discussion 336

April 13, 201413 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 13, 2014, 1:43 PM CDT for 13 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Apr 13, 2014, 1:43 PM CDT (18:43 UTC)
Expired: Apr 13, 2014, 3:45 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Brown County, TX, Callahan County, TX, Coleman County, TX, Comanche County, TX, Concho County, TX, Eastland County, TX, Palo Pinto County, TX, Runnels County, TX, Schleicher County, TX, Shackelford County, TX, Stephens County, TX, Tom Green County, TX, Young County, TX

The radar

The Dyess AFB radar (KDYX), 43 km from the middle of the area, began a volume at 18:48 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 76Apr 13, 5:15 PM CDT

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 6.7 hours before the alert went out and 209 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: 73 J/kg
Mixed-layer CIN: -284 J/kg
Mixed-layer LCL: 635 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 334 m²/s²
0-3 km storm-relative helicity: 439 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Apr 13, 12:26 PM CDT	Mesoscale Discussion	SPC	Wichita	94 min
Apr 13, 1:56 PM CDT	Tornado Watch	SPC	Archer, Clay, Cooke, Grayson, Jack, Montague and 3 more	8 hr
Apr 13, 2:34 PM CDT	Mesoscale Discussion	SPC	Anderson, Bowie, Camp, Cass, Cherokee, Falls and 20 more	2 hr
Apr 13, 4:54 PM CDT	Mesoscale Discussion	SPC	Anderson, Bosque, Bowie, Camp, Cass, Cherokee and 34 more	66 min
Apr 13, 5:13 PM CDT	Tornado Watch	SPC	Anderson, Bell, Bosque, Bowie, Brown, Camp and 50 more	6 hr
Apr 13, 6:25 PM CDT	Mesoscale Discussion	SPC	Archer, Clay, Cooke, Grayson, Montague, Wichita	65 min

Nearby

Mesoscale Discussions in Texas, 2014 Every mesoscale discussion in 2014

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.