Alert archive / Texas / Mesoscale Discussions in 2013

Mesoscale Discussion 130

February 9, 201327 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Feb 9, 2013, 11:12 PM CST for 27 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Feb 9, 2013, 11:12 PM CST (05:12 UTC)
Expired: Feb 10, 2013, 1:15 AM CST
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 27 counties

Bosque County, TX, Brown County, TX, Callahan County, TX, Coleman County, TX, Comanche County, TX, Concho County, TX, Cooke County, TX, Dallas County, TX, Denton County, TX, Eastland County, TX, Erath County, TX, Hamilton County, TX, Hood County, TX, Jack County, TX, Johnson County, TX, Lampasas County, TX, McCulloch County, TX, Mills County, TX, Montague County, TX, Palo Pinto County, TX, Parker County, TX, San Saba County, TX, Somervell County, TX, Stephens County, TX, Tarrant County, TX, Wise County, TX, Young County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 77 km from the middle of the area, began a volume at 05:15 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 28Feb 9, 11:40 PM CST

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 5.2 hours before the alert went out and 82 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: 1 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 459 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 728 m²/s²
0-3 km storm-relative helicity: 777 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

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
Feb 9, 11:37 PM CST	Severe Thunderstorm Watch	SPC	Bell, Bosque, Brown, Callahan, Coleman, Collin and 52 more	6 hr
Feb 10, 12:41 AM CST	Mesoscale Discussion	SPC	Bandera, Bastrop, Bexar, Blanco, Burnet, Caldwell and 11 more	94 min
Feb 10, 1:33 AM CST	Tornado Watch	SPC	Anderson, Bandera, Bastrop, Bell, Blanco, Brazos and 22 more	6 hr
Feb 10, 2:39 AM CST	Mesoscale Discussion	SPC	Bosque, Camp, Cherokee, Collin, Coryell, Dallas and 33 more	2 hr
Feb 10, 4:18 AM CST	Severe Thunderstorm Watch	SPC	Angelina, Bowie, Camp, Cass, Cherokee, Franklin and 15 more	5 hr
Feb 10, 5:12 AM CST	Mesoscale Discussion	SPC	Anderson, Angelina, Brazos, Burleson, Cherokee, Falls and 18 more	93 min
Feb 10, 6:20 AM CST	Mesoscale Discussion	SPC	Angelina, Jasper, Nacogdoches, Newton, Panola, Polk and 7 more	85 min
Feb 10, 6:58 AM CST	Tornado Watch	SPC	Angelina, Cherokee, Grimes, Houston, Jasper, Madison and 12 more	7 hr
Feb 10, 10:19 AM CST	Mesoscale Discussion	SPC	Jasper, Newton, Sabine	86 min

Nearby

Mesoscale Discussions in Texas, 2013 Every mesoscale discussion in 2013

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.