Alert archive / Texas / Mesoscale Discussions in 2003

Mesoscale Discussion 991

May 15, 200319 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 15, 2003, 2:10 AM CDT for 19 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 15, 2003, 2:10 AM CDT (07:10 UTC)
Expired: May 15, 2003, 4:15 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Anderson County, TX, Collin County, TX, Dallas County, TX, Denton County, TX, Ellis County, TX, Henderson County, TX, Hill County, TX, Hood County, TX, Hunt County, TX, Johnson County, TX, Kaufman County, TX, Navarro County, TX, Parker County, TX, Rains County, TX, Rockwall County, TX, Somervell County, TX, Tarrant County, TX, Van Zandt County, TX, Wood County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 49 km from the middle of the area, began a volume at 07:10 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

Fort Worth, TX (KFWD), launched 00:00Z, 7.2 hours before the alert went out and 54 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: 3397 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 1078 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 97 m²/s²
0-3 km storm-relative helicity: 168 m²/s²
Significant tornado parameter: 3.5
Supercell composite: 16.7

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 14, 7:36 PM CDT	Mesoscale Discussion	SPC	Bowie, Red River	114 min
May 14, 9:20 PM CDT	Mesoscale Discussion	SPC	Cass, Harrison, Marion	115 min
May 14, 11:20 PM CDT	Mesoscale Discussion	SPC	Bell, Bosque, Coryell, Ellis, Falls, Freestone and 5 more	115 min
May 14, 11:35 PM CDT	Severe Thunderstorm Watch	SPC	Camp, Cass, Cherokee, Franklin, Gregg, Harrison and 8 more	5 hr
May 14, 11:45 PM CDT	Severe Thunderstorm Watch	SPC	Anderson, Bosque, Collin, Dallas, Delta, Denton and 16 more	5 hr
May 15, 2:27 AM CDT	Mesoscale Discussion	SPC	Gregg, Harrison, Marion, Panola, Rusk, Shelby	2 hr
May 15, 1:31 PM CDT	Mesoscale Discussion	SPC	Armstrong, Briscoe, Carson, Castro, Dallam, Deaf Smith and 10 more	119 min
May 15, 1:55 PM CDT	Tornado Watch	SPC	Armstrong, Carson, Collingsworth, Dallam, Deaf Smith, Donley and 13 more	6 hr
May 15, 3:41 PM CDT	Mesoscale Discussion	SPC	Armstrong, Baylor, Briscoe, Carson, Castro, Childress and 30 more	94 min
May 15, 4:05 PM CDT	Tornado Watch	SPC	Borden, Briscoe, Castro, Childress, Cottle, Crosby and 20 more	6 hr
May 15, 5:15 PM CDT	Mesoscale Discussion	SPC	Frio, Kinney, Maverick, Uvalde, Zavala	2 hr
May 15, 5:49 PM CDT	Mesoscale Discussion	SPC	Baylor, Coke, Cottle, Fisher, Foard, Hardeman and 17 more	116 min
May 15, 6:25 PM CDT	Tornado Watch	SPC	Archer, Baylor, Borden, Briscoe, Brown, Callahan and 45 more	6 hr
May 15, 6:47 PM CDT	Mesoscale Discussion	SPC	Childress, Collingsworth, Donley, Gray, Hall, Hansford and 6 more	58 min
May 15, 6:50 PM CDT	Tornado Watch	SPC	Armstrong, Carson, Collingsworth, Dallam, Donley, Gray and 12 more	5 hr

Nearby

Mesoscale Discussions in Texas, 2003 Every mesoscale discussion in 2003

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.