Alert archive / Texas / Mesoscale Discussions in 2013

Mesoscale Discussion 73

January 29, 20137 counties in Arkansas; 11 counties in Oklahoma; 24 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Jan 29, 2013, 2:15 PM CST for 7 counties in Arkansas; 11 counties in Oklahoma; 24 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jan 29, 2013, 2:15 PM CST (20:15 UTC)
Expired: Jan 29, 2013, 4:15 PM CST
In force: 2 hr
Issued by: the Storm Prediction Center

All 42 counties

Howard County, AR, Little River County, AR, Logan County, AR, Polk County, AR, Scott County, AR, Sebastian County, AR, Sevier County, AR, Atoka County, OK, Bryan County, OK, Choctaw County, OK, Coal County, OK, Haskell County, OK, Latimer County, OK, LeFlore County, OK, McCurtain County, OK, McIntosh County, OK, Pittsburg County, OK, Pushmataha County, OK, Bowie County, TX, Camp County, TX, Cass County, TX, Collin County, TX, Dallas County, TX, Delta County, TX, Fannin County, TX, Franklin County, TX, Grayson County, TX, Gregg County, TX, Harrison County, TX, Hopkins County, TX, Hunt County, TX, Kaufman County, TX, Lamar County, TX, Marion County, TX, Morris County, TX, Rains County, TX, Red River County, TX, Rockwall County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wood County, TX

The radar

The Western Arkansas radar (KSRX), 186 km from the middle of the area, began a volume at 20:18 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 10Jan 29, 5:40 PM CST

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 8.3 hours before the alert went out and 191 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: 250 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 471 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 266 m²/s²
0-3 km storm-relative helicity: 336 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 1.4

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
Jan 29, 7:26 AM CST	Tornado Watch	SPC	Benton, Carroll, Crawford, Madison, Washington	10 hr
Jan 29, 9:46 AM CST	Mesoscale Discussion	SPC	Crawford, Franklin, Hempstead, Howard, Johnson, Little River and 9 more	119 min
Jan 29, 10:59 AM CST	Tornado Watch	SPC	Franklin, Hempstead, Howard, Johnson, Little River, Logan and 9 more	8 hr
Jan 29, 11:05 AM CST	Mesoscale Discussion	SPC	Benton, Carroll, Crawford, Madison, Washington	55 min
Jan 29, 11:54 AM CST	Mesoscale Discussion	SPC	Baxter, Boone, Fulton, Izard, Marion, Newton and 3 more	96 min
Jan 29, 12:35 PM CST	Tornado Watch	SPC	Baxter, Boone, Cleburne, Conway, Fulton, Izard and 6 more	7 hr
Jan 29, 1:19 PM CST	Mesoscale Discussion	SPC	Benton, Boone, Carroll, Crawford, Madison, Washington	56 min
Jan 29, 3:31 PM CST	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Cleburne, Crawford and 12 more	89 min
Jan 29, 4:37 PM CST	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Chicot, Desha, Drew and 5 more	2 hr
Jan 29, 4:58 PM CST	Mesoscale Discussion	SPC	Baxter, Boone, Bradley, Calhoun, Clark, Cleburne and 47 more	92 min
Jan 29, 5:37 PM CST	Tornado Watch	SPC	Arkansas, Ashley, Baxter, Boone, Bradley, Calhoun and 62 more	8 hr
Jan 28, 9:29 PM CST	Mesoscale Discussion	SPC	Cleveland, Creek, Lincoln, Logan, Noble, Oklahoma and 4 more	2 hr
Jan 29, 3:28 AM CST	Mesoscale Discussion	SPC	Alfalfa, Blaine, Caddo, Canadian, Comanche, Cotton and 16 more	92 min
Jan 29, 4:57 AM CST	Tornado Watch	SPC	Alfalfa, Blaine, Caddo, Canadian, Cleveland, Comanche and 27 more	7 hr
Jan 29, 10:37 AM CST	Mesoscale Discussion	SPC	Love	53 min
Jan 29, 11:28 AM CST	Severe Thunderstorm Watch	SPC	Bosque, Brown, Callahan, Coleman, Comanche, Concho and 30 more	6 hr
Jan 29, 3:46 PM CST	Mesoscale Discussion	SPC	Coryell, Dallas, Ellis, Hill, McLennan	119 min
Jan 29, 5:51 PM CST	Mesoscale Discussion	SPC	Anderson, Angelina, Brazos, Burleson, Camp, Cass and 25 more	114 min

Nearby

Mesoscale Discussions in Texas, 2013 Mesoscale Discussions in Oklahoma, 2013 Mesoscale Discussions in Arkansas, 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.