Alert archive / Texas / Mesoscale Discussions in 2015

Mesoscale Discussion 642

May 14, 201522 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 14, 2015, 5:48 PM CDT for 22 counties in Texas. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued: May 14, 2015, 5:48 PM CDT (22:48 UTC)
Expired: May 14, 2015, 7:45 PM CDT
In force: 117 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 22 counties

Atascosa County, TX, Bandera County, TX, Bexar County, TX, Comal County, TX, Dimmit County, TX, Edwards County, TX, Frio County, TX, Gillespie County, TX, Guadalupe County, TX, Karnes County, TX, Kendall County, TX, Kerr County, TX, Kimble County, TX, Kinney County, TX, La Salle County, TX, Maverick County, TX, Medina County, TX, Real County, TX, Uvalde County, TX, Val Verde County, TX, Wilson County, TX, Zavala County, TX

The radar

The Laughlin AFB radar (KDFX), 74 km from the middle of the area, began a volume at 22:50 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

Del Rio, TX (KDLF), launched 12:00Z, 10.8 hours before the alert went out and 128 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: 1045 J/kg
Mixed-layer CIN: -51 J/kg
Mixed-layer LCL: 613 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 62 m²/s²
0-3 km storm-relative helicity: 46 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.3

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
May 13, 7:15 PM CDT	Mesoscale Discussion	SPC	Carson, Childress, Collingsworth, Cottle, Donley, Foard and 5 more	90 min
May 14, 2:36 PM CDT	Mesoscale Discussion	SPC	Andrews, Borden, Cochran, Coke, Crane, Crosby and 32 more	114 min
May 14, 4:05 PM CDT	Severe Thunderstorm Watch	SPC	Andrews, Bailey, Borden, Briscoe, Castro, Childress and 45 more	7 hr
May 14, 6:28 PM CDT	Mesoscale Discussion	SPC	Andrews, Borden, Cochran, Coke, Crane, Crockett and 31 more	92 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.