Alert archive / Texas / Mesoscale Discussions in 2003

Mesoscale Discussion 2502

November 17, 200312 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Nov 17, 2003, 10:21 AM CST for 12 counties in Texas. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued: Nov 17, 2003, 10:21 AM CST (16:21 UTC)
Expired: Nov 17, 2003, 11:45 AM CST
In force: 84 min
Issued by: the Storm Prediction Center

Counties Brazoria County, TX, Calhoun County, TX, Chambers County, TX, Fort Bend County, TX, Hardin County, TX, Harris County, TX, Jackson County, TX, Jefferson County, TX, Liberty County, TX, Matagorda County, TX, Victoria County, TX, Wharton County, TX

The radar

The Houston radar (KHGX), 78 km from the middle of the area, began a volume at 16:25 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 950Nov 17, 12:45 PM CST

The nearest sounding before it

Corpus Christi, TX (KCRP), launched 12:00Z, 4.4 hours before the alert went out and 220 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: 1818 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 573 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 150 m²/s²
0-3 km storm-relative helicity: 146 m²/s²
Significant tornado parameter: 1.4
Supercell composite: 8.4

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
Nov 16, 6:02 PM CST	Mesoscale Discussion	SPC	Armstrong, Briscoe, Childress, Cottle, Crosby, Dickens and 12 more	118 min
Nov 17, 1:11 AM CST	Mesoscale Discussion	SPC	Clay, Hardeman, Hemphill, Lipscomb, Montague, Wheeler and 2 more	3 hr
Nov 17, 7:11 AM CST	Mesoscale Discussion	SPC	Anderson, Angelina, Austin, Brazos, Burleson, Cherokee and 40 more	3 hr
Nov 17, 7:43 AM CST	Mesoscale Discussion	SPC	Cooke, Fannin, Grayson, Lamar, Montague	3 hr
Nov 17, 8:15 AM CST	Tornado Watch	SPC	Archer, Clay, Collin, Cooke, Dallas, Denton and 11 more	5 hr
Nov 17, 8:20 AM CST	Tornado Watch	SPC	Anderson, Angelina, Austin, Bastrop, Bell, Brazoria and 54 more	5 hr
Nov 17, 9:58 AM CST	Mesoscale Discussion	SPC	Bandera, Bexar, Blanco, Brown, Burnet, Callahan and 36 more	92 min
Nov 17, 10:59 AM CST	Mesoscale Discussion	SPC	Archer, Clay, Collin, Cooke, Dallas, Denton and 11 more	91 min
Nov 17, 11:50 AM CST	Mesoscale Discussion	SPC	Anderson, Angelina, Aransas, Austin, Bell, Bosque and 75 more	85 min
Nov 17, 12:20 PM CST	Tornado Watch	SPC	Bell, Bosque, Collin, Comanche, Cooke, Coryell and 36 more	6 hr
Nov 17, 12:45 PM CST	Tornado Watch	SPC	Brazoria, Calhoun, Chambers, Colorado, DeWitt, Fort Bend and 15 more	5 hr
Nov 17, 2:57 PM CST	Mesoscale Discussion	SPC	Anderson, Bell, Bosque, Bowie, Camp, Cass and 42 more	2 hr
Nov 17, 3:02 PM CST	Mesoscale Discussion	SPC	Austin, Brazoria, Calhoun, Chambers, Colorado, DeWitt and 16 more	88 min
Nov 17, 5:07 PM CST	Mesoscale Discussion	SPC	Angelina, Brazoria, Calhoun, Chambers, Fort Bend, Galveston and 14 more	53 min
Nov 17, 5:25 PM CST	Mesoscale Discussion	SPC	Bowie, Camp, Cass, Delta, Franklin, Gregg and 15 more	65 min
Nov 17, 5:35 PM CST	Tornado Watch	SPC	Chambers, Galveston, Hardin, Jasper, Jefferson, Newton and 2 more	6 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.