Alert archive / Texas / Mesoscale Discussions in 2014

Mesoscale Discussion 1934

November 22, 201418 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Nov 22, 2014, 1:45 PM CST for 18 counties in Texas. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: Nov 22, 2014, 1:45 PM CST (19:45 UTC)
Expired: Nov 22, 2014, 2:45 PM CST
In force: 60 min
Issued by: the Storm Prediction Center
Chance of a watch: 80%

Counties Brooks County, TX, Dimmit County, TX, Duval County, TX, Edwards County, TX, Frio County, TX, Hidalgo County, TX, Jim Hogg County, TX, Kinney County, TX, La Salle County, TX, Maverick County, TX, McMullen County, TX, Medina County, TX, Real County, TX, Starr County, TX, Uvalde County, TX, Webb County, TX, Zapata County, TX, Zavala County, TX

The radar

The Laughlin AFB radar (KDFX), 117 km from the middle of the area, began a volume at 19:45 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 557Nov 22, 3:10 PM CST

The nearest sounding before it

Del Rio, TX (KDLF), launched 12:00Z, 7.8 hours before the alert went out and 166 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: 1655 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 480 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 215 m²/s²
0-3 km storm-relative helicity: 359 m²/s²
Significant tornado parameter: 1.6
Supercell composite: 7.6

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
Nov 21, 11:33 PM CST	Mesoscale Discussion	SPC	Bosque, Comanche, Cooke, Coryell, Dallas, Denton and 16 more	57 min
Nov 22, 3:06 PM CST	Severe Thunderstorm Watch	SPC	Atascosa, Bee, Bexar, Brooks, Cameron, DeWitt and 29 more	7 hr
Nov 22, 5:31 PM CST	Mesoscale Discussion	SPC	Bandera, Brooks, Cameron, Dimmit, Duval, Edwards and 17 more	59 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.