Alert archive / Texas / Mesoscale Discussions in 2018

Mesoscale Discussion 316

May 2, 201818 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 2, 2018, 3:13 PM CDT for 18 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 2, 2018, 3:13 PM CDT (20:13 UTC)
Expired: May 2, 2018, 5:15 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 80%

Counties Coke County, TX, Concho County, TX, Crockett County, TX, Edwards County, TX, Glasscock County, TX, Irion County, TX, Kimble County, TX, Menard County, TX, Nolan County, TX, Reagan County, TX, Real County, TX, Runnels County, TX, Schleicher County, TX, Sterling County, TX, Sutton County, TX, Terrell County, TX, Tom Green County, TX, Val Verde County, TX

The radar

The San Angelo radar (KSJT), 93 km from the middle of the area, began a volume at 20:15 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 64May 2, 4:40 PM CDT

The nearest sounding before it

Del Rio, TX (KDLF), launched 12:00Z, 8.2 hours before the alert went out and 138 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: 2419 J/kg
Mixed-layer CIN: -77 J/kg
Mixed-layer LCL: 481 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 205 m²/s²
0-3 km storm-relative helicity: 300 m²/s²
Significant tornado parameter: 2.5
Supercell composite: 7.0

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
May 2, 11:36 AM CDT	Mesoscale Discussion	SPC	Armstrong, Briscoe, Carson, Childress, Collingsworth, Donley and 8 more	2 hr
May 2, 12:59 PM CDT	Tornado Watch	SPC	Archer, Baylor, Childress, Clay, Collingsworth, Cottle and 14 more	9 hr
May 2, 3:24 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Childress, Clay, Collingsworth, Cottle and 9 more	3 hr
May 2, 4:41 PM CDT	Severe Thunderstorm Watch	SPC	Brown, Callahan, Coke, Coleman, Concho, Crockett and 36 more	9 hr
May 2, 6:10 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Foard, Knox, Wichita, Wilbarger	95 min

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.