Alert archive / Texas / Mesoscale Discussions in 2011

Mesoscale Discussion 2305

November 8, 201113 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Nov 8, 2011, 3:53 PM CST for 13 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Nov 8, 2011, 3:53 PM CST (21:53 UTC)
Expired: Nov 8, 2011, 6:00 PM CST
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Angelina County, TX, Grimes County, TX, Hardin County, TX, Harris County, TX, Jasper County, TX, Liberty County, TX, Montgomery County, TX, Orange County, TX, Polk County, TX, San Jacinto County, TX, Trinity County, TX, Tyler County, TX, Walker County, TX

The radar

The Houston radar (KHGX), 115 km from the middle of the area, began a volume at 21:53 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.

Tornado Watch 877Nov 8, 5:30 PM CST

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 9.9 hours before the alert went out and 180 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: 403 J/kg
Mixed-layer CIN: -94 J/kg
Mixed-layer LCL: 438 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 139 m²/s²
0-3 km storm-relative helicity: 201 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.2

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 7, 6:44 PM CST	Tornado Watch	SPC	Bosque, Camp, Collin, Cooke, Coryell, Dallas and 24 more	2 hr
Nov 7, 7:43 PM CST	Mesoscale Discussion	SPC	Archer, Baylor, Clay, Foard, Haskell, Knox and 3 more	62 min
Nov 7, 8:28 PM CST	Tornado Watch	SPC	Archer, Baylor, Clay, Foard, Hardeman, Knox and 2 more	8 hr
Nov 7, 8:53 PM CST	Mesoscale Discussion	SPC	Borden, Coke, Fisher, Glasscock, Haskell, Howard and 9 more	2 hr
Nov 7, 9:16 PM CST	Tornado Watch	SPC	Borden, Callahan, Coke, Coleman, Concho, Crane and 31 more	8 hr
Nov 7, 11:20 PM CST	Mesoscale Discussion	SPC	Archer, Baylor, Clay, Knox, Wichita	85 min
Nov 8, 2:12 AM CST	Mesoscale Discussion	SPC	Archer, Baylor, Brown, Callahan, Clay, Coleman and 28 more	93 min
Nov 8, 10:31 AM CST	Mesoscale Discussion	SPC	Bowie, Camp, Cass, Franklin, Gregg, Harrison and 12 more	29 min
Nov 8, 10:49 AM CST	Tornado Watch	SPC	Anderson, Angelina, Bowie, Camp, Cass, Cherokee and 30 more	7 hr
Nov 8, 1:03 PM CST	Mesoscale Discussion	SPC	Anderson, Angelina, Bowie, Camp, Cass, Cherokee and 24 more	57 min
Nov 8, 1:44 PM CST	Mesoscale Discussion	SPC	Austin, Chambers, Grimes, Hardin, Harris, Jasper and 10 more	61 min
Nov 8, 1:59 PM CST	Tornado Watch	SPC	Chambers, Grimes, Hardin, Harris, Houston, Jasper and 12 more	6 hr
Nov 8, 3:48 PM CST	Mesoscale Discussion	SPC	Angelina, Bowie, Camp, Cass, Cherokee, Gregg and 11 more	87 min
Nov 8, 5:09 PM CST	Mesoscale Discussion	SPC	Hardin, Jasper, Newton, Orange, Sabine, San Augustine and 2 more	66 min
Nov 8, 5:30 PM CST	Tornado Watch	SPC	Angelina, Hardin, Jasper, Jefferson, Nacogdoches, Newton and 6 more	7 hr

Nearby

Mesoscale Discussions in Texas, 2011 Every mesoscale discussion in 2011

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.