Alert archive / Texas / Mesoscale Discussions in 2018

Mesoscale Discussion 1724

December 26, 201830 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Dec 26, 2018, 11:33 AM CST for 30 counties in Texas. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued: Dec 26, 2018, 11:33 AM CST (17:33 UTC)
Expired: Dec 26, 2018, 1:30 PM CST
In force: 117 min
Issued by: the Storm Prediction Center
Chance of a watch: 95%

All 30 counties

Bailey County, TX, Borden County, TX, Briscoe County, TX, Castro County, TX, Coke County, TX, Crockett County, TX, Crosby County, TX, Dawson County, TX, Dickens County, TX, Floyd County, TX, Garza County, TX, Glasscock County, TX, Hale County, TX, Hockley County, TX, Howard County, TX, Irion County, TX, Kent County, TX, Lamb County, TX, Lubbock County, TX, Lynn County, TX, Martin County, TX, Midland County, TX, Mitchell County, TX, Motley County, TX, Reagan County, TX, Scurry County, TX, Sterling County, TX, Swisher County, TX, Terry County, TX, Upton County, TX

The radar

The Midland/Odessa radar (KMAF), 53 km from the middle of the area, began a volume at 17:35 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 441Dec 26, 12:45 PM CST

The nearest sounding before it

Midland Regional, TX (KMAF), launched 12:00Z, 5.6 hours before the alert went out and 53 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: 882 J/kg
Mixed-layer CIN: -36 J/kg
Mixed-layer LCL: 560 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 286 m²/s²
0-3 km storm-relative helicity: 276 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 5.6

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
Dec 26, 12:28 PM CST	Mesoscale Discussion	SPC	Archer, Baylor, Brown, Callahan, Coleman, Comanche and 22 more	2 hr
Dec 26, 12:44 PM CST	Severe Thunderstorm Watch	SPC	Armstrong, Borden, Briscoe, Carson, Castro, Childress and 40 more	6 hr
Dec 26, 2:11 PM CST	Tornado Watch	SPC	Bell, Bosque, Brown, Burnet, Callahan, Coleman and 29 more	10 hr
Dec 26, 3:21 PM CST	Mesoscale Discussion	SPC	Armstrong, Borden, Briscoe, Castro, Childress, Coke and 34 more	84 min
Dec 26, 4:43 PM CST	Mesoscale Discussion	SPC	Archer, Baylor, Bell, Blanco, Bosque, Brown and 42 more	2 hr
Dec 26, 4:58 PM CST	Mesoscale Discussion	SPC	Archer, Baylor, Bell, Blanco, Bosque, Brown and 42 more	62 min
Dec 26, 5:06 PM CST	Severe Thunderstorm Watch	SPC	Archer, Baylor, Clay, Foard, Hardeman, Knox and 2 more	4 hr
Dec 26, 5:48 PM CST	Tornado Watch	SPC	Atascosa, Bandera, Bastrop, Bexar, Blanco, Caldwell and 17 more	8 hr

Nearby

Mesoscale Discussions in Texas, 2018 Every mesoscale discussion in 2018

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.