Alert archive / Texas / Mesoscale Discussions in 2007

Mesoscale Discussion 479

April 13, 200714 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 13, 2007, 12:12 PM CDT for 14 counties in Texas. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued: Apr 13, 2007, 12:12 PM CDT (17:12 UTC)
Expired: Apr 13, 2007, 1:15 PM CDT
In force: 63 min
Issued by: the Storm Prediction Center

Counties Archer County, TX, Baylor County, TX, Fisher County, TX, Haskell County, TX, Hood County, TX, Jack County, TX, Jones County, TX, Knox County, TX, Palo Pinto County, TX, Shackelford County, TX, Stephens County, TX, Stonewall County, TX, Throckmorton County, TX, Young County, TX

The radar

The Dyess AFB radar (KDYX), 62 km from the middle of the area, began a volume at 17:13 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.

The nearest sounding before it

Fort Sill, OK (KFSI), launched 12:00Z, 5.2 hours before the alert went out and 198 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1491 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 447 m²/s²
0-3 km storm-relative helicity: 635 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

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
Apr 12, 7:37 PM CDT	Mesoscale Discussion	SPC	Baylor, Collingsworth, Foard, Hardeman, Wheeler, Wichita and 1 more	113 min
Apr 12, 9:35 PM CDT	Mesoscale Discussion	SPC	Armstrong, Bailey, Briscoe, Carson, Castro, Childress and 35 more	115 min
Apr 12, 11:31 PM CDT	Mesoscale Discussion	SPC	Andrews, Armstrong, Bailey, Borden, Briscoe, Carson and 38 more	119 min
Apr 12, 11:46 PM CDT	Severe Thunderstorm Watch	SPC	Andrews, Armstrong, Bailey, Baylor, Borden, Briscoe and 63 more	7 hr
Apr 13, 2:36 AM CDT	Mesoscale Discussion	SPC	Armstrong, Briscoe, Carson, Castro, Childress, Collingsworth and 23 more	84 min
Apr 13, 5:34 AM CDT	Mesoscale Discussion	SPC	Archer, Armstrong, Baylor, Briscoe, Callahan, Carson and 32 more	86 min
Apr 13, 12:27 PM CDT	Tornado Watch	SPC	Archer, Baylor, Brown, Callahan, Clay, Coke and 27 more	7 hr
Apr 13, 12:37 PM CDT	Mesoscale Discussion	SPC	Foard, Hardeman, Wichita, Wilbarger	113 min
Apr 13, 2:51 PM CDT	Mesoscale Discussion	SPC	Anderson, Bell, Bosque, Cherokee, Collin, Cooke and 31 more	54 min
Apr 13, 5:08 PM CDT	Mesoscale Discussion	SPC	Angelina, Chambers, Cherokee, Hardin, Harris, Harrison and 18 more	97 min
Apr 13, 5:43 PM CDT	Tornado Watch PDS	SPC	Bell, Bosque, Collin, Cooke, Coryell, Dallas and 22 more	4 hr
Apr 13, 5:48 PM CDT	Tornado Watch PDS	SPC	Anderson, Angelina, Bowie, Brazos, Burleson, Camp and 39 more	8 hr
Apr 13, 5:58 PM CDT	Mesoscale Discussion	SPC	Bandera, Blanco, Burnet, Edwards, Gillespie, Hays and 16 more	62 min
Apr 13, 6:27 PM CDT	Tornado Watch	SPC	Atascosa, Bandera, Bastrop, Bexar, Blanco, Burnet and 26 more	8 hr

Nearby

Mesoscale Discussions in Texas, 2007 Every mesoscale discussion in 2007

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.