Alert archive / Texas / Mesoscale Discussions in 2015

Mesoscale Discussion 2067

December 26, 201521 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Dec 26, 2015, 2:58 PM CST for 21 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Dec 26, 2015, 2:58 PM CST (20:58 UTC)
Expired: Dec 26, 2015, 5:00 PM CST
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 21 counties

Austin County, TX, Bastrop County, TX, Blanco County, TX, Brazos County, TX, Burleson County, TX, Burnet County, TX, Caldwell County, TX, Colorado County, TX, Comal County, TX, Fayette County, TX, Gonzales County, TX, Grimes County, TX, Guadalupe County, TX, Hays County, TX, Kendall County, TX, Lee County, TX, Llano County, TX, Travis County, TX, Waller County, TX, Washington County, TX, Williamson County, TX

The radar

The Ft Hood radar (KGRK), 50 km from the middle of the area, began a volume at 20:58 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

Corpus Christi, TX (KCRP), launched 12:00Z, 9.0 hours before the alert went out and 283 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: 1756 J/kg
Mixed-layer CIN: -70 J/kg
Mixed-layer LCL: 499 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 74 m²/s²
0-3 km storm-relative helicity: 121 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 1.7

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
Dec 26, 11:39 AM CST	Mesoscale Discussion	SPC	Baylor, Haskell, Knox, Stonewall, Throckmorton, Wichita and 1 more	3 hr
Dec 26, 12:02 PM CST	Mesoscale Discussion	SPC	Bosque, Callahan, Collin, Comanche, Cooke, Dallas and 28 more	58 min
Dec 26, 12:35 PM CST	Tornado Watch	SPC	Anderson, Bell, Bosque, Camp, Clay, Collin and 49 more	9 hr
Dec 26, 3:51 PM CST	Mesoscale Discussion	SPC	Anderson, Bell, Bosque, Brown, Camp, Clay and 51 more	114 min
Dec 26, 5:52 PM CST	Mesoscale Discussion	SPC	Bosque, Collin, Comanche, Cooke, Coryell, Dallas and 27 more	83 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; radar from the NEXRAD Level II archive.