Alert archive / Texas / Mesoscale Discussions in 2012

Mesoscale Discussion 789

May 11, 201213 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 11, 2012, 5:51 PM CDT for 13 counties in Texas. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued: May 11, 2012, 5:51 PM CDT (22:51 UTC)
Expired: May 11, 2012, 7:15 PM CDT
In force: 84 min
Issued by: the Storm Prediction Center
Chance of a watch: 5%

Counties Bee County, TX, Brooks County, TX, Duval County, TX, Goliad County, TX, Hidalgo County, TX, Jim Hogg County, TX, Jim Wells County, TX, Kleberg County, TX, Nueces County, TX, Refugio County, TX, San Patricio County, TX, Starr County, TX, Victoria County, TX

The radar

The Corpus Christi radar (KCRP), 65 km from the middle of the area, began a volume at 22:51 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, 10.9 hours before the alert went out and 76 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: 234 J/kg
Mixed-layer CIN: -248 J/kg
Mixed-layer LCL: 1140 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 136 m²/s²
0-3 km storm-relative helicity: 63 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 10, 7:18 PM CDT	Mesoscale Discussion	SPC	Aransas, Atascosa, Austin, Bastrop, Bee, Bexar and 43 more	57 min
May 10, 7:50 PM CDT	Tornado Watch	SPC	Aransas, Atascosa, Austin, Bastrop, Bee, Bell and 48 more	9 hr
May 10, 9:42 PM CDT	Mesoscale Discussion	SPC	Aransas, Atascosa, Austin, Bastrop, Bee, Bell and 36 more	63 min
May 10, 11:36 PM CDT	Mesoscale Discussion	SPC	Aransas, Brooks, Calhoun, Cameron, Hidalgo, Jackson and 13 more	84 min
May 11, 1:40 AM CDT	Mesoscale Discussion	SPC	Aransas, Austin, Bee, Brazoria, Brooks, Calhoun and 25 more	65 min
May 11, 2:41 AM CDT	Mesoscale Discussion	SPC	Cameron, Chambers, Galveston, Hidalgo, Jefferson, Kenedy and 3 more	34 min
May 11, 1:22 PM CDT	Mesoscale Discussion	SPC	Anderson, Bosque, Camp, Cherokee, Collin, Cooke and 28 more	53 min
May 11, 2:13 PM CDT	Mesoscale Discussion	SPC	Atascosa, Austin, Bandera, Bastrop, Bell, Bexar and 41 more	2 hr
May 11, 5:18 PM CDT	Mesoscale Discussion	SPC	Anderson, Angelina, Austin, Bastrop, Bell, Blanco and 40 more	87 min

Nearby

Mesoscale Discussions in Texas, 2012 Every mesoscale discussion in 2012

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.