Alert archive / Texas / Mesoscale Discussions in 2014

Mesoscale Discussion 1855

October 12, 201417 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Oct 12, 2014, 5:39 PM CDT for 17 counties in Texas. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: Oct 12, 2014, 5:39 PM CDT (22:39 UTC)
Expired: Oct 12, 2014, 7:15 PM CDT
In force: 96 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

Counties Brown County, TX, Callahan County, TX, Coleman County, TX, Comanche County, TX, Concho County, TX, Eastland County, TX, Fisher County, TX, Haskell County, TX, Jones County, TX, McCulloch County, TX, Menard County, TX, Nolan County, TX, Runnels County, TX, Shackelford County, TX, Stephens County, TX, Taylor County, TX, Throckmorton County, TX

The radar

The Dyess AFB radar (KDYX), 53 km from the middle of the area, began a volume at 22:41 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.

Severe Thunderstorm Watch 529Oct 12, 7:45 PM CDT

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 10.7 hours before the alert went out and 225 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 895 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 87 m²/s²
0-3 km storm-relative helicity: 126 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
Oct 12, 2:27 PM CDT	Mesoscale Discussion	SPC	Armstrong, Briscoe, Carson, Castro, Dallam, Deaf Smith and 14 more	2 hr
Oct 12, 3:09 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Childress, Collingsworth, Cottle, Foard and 8 more	96 min
Oct 12, 3:48 PM CDT	Severe Thunderstorm Watch	SPC	Childress, Collingsworth, Cottle, Donley, Foard, Gray and 10 more	7 hr
Oct 12, 3:50 PM CDT	Mesoscale Discussion	SPC	Angelina, Austin, Colorado, Fort Bend, Grimes, Hardin and 15 more	85 min
Oct 12, 6:37 PM CDT	Mesoscale Discussion	SPC	Armstrong, Briscoe, Childress, Collingsworth, Cottle, Donley and 8 more	53 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.