Alert archive / Texas / Mesoscale Discussions in 2004

Mesoscale Discussion 689

May 13, 200420 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 13, 2004, 2:57 PM CDT for 20 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 13, 2004, 2:57 PM CDT (19:57 UTC)
Expired: May 13, 2004, 5:00 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Brown County, TX, Callahan County, TX, Coleman County, TX, Concho County, TX, Eastland County, TX, Haskell County, TX, Jones County, TX, Kimble County, TX, Mason County, TX, McCulloch County, TX, Menard County, TX, Runnels County, TX, Schleicher County, TX, Shackelford County, TX, Stephens County, TX, Sutton County, TX, Taylor County, TX, Throckmorton County, TX, Tom Green County, TX, Young County, TX

The radar

The San Angelo radar (KSJT), 88 km from the middle of the area, began a volume at 19:57 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 203May 13, 6:55 PM CDT

The nearest sounding before it

Midland Regional, TX (KMAF), launched 12:00Z, 8.0 hours before the alert went out and 249 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: 2743 J/kg
Mixed-layer CIN: -154 J/kg
Mixed-layer LCL: 1092 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 135 m²/s²
0-3 km storm-relative helicity: 162 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.4

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
May 12, 8:04 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Callahan, Fisher, Foard, Hardeman and 13 more	86 min
May 13, 3:52 AM CDT	Mesoscale Discussion	SPC	Anderson, Angelina, Austin, Bastrop, Brazos, Burleson and 27 more	83 min
May 13, 8:30 AM CDT	Tornado Watch	SPC	Angelina, Austin, Bastrop, Brazos, Burleson, Caldwell and 17 more	6 hr
May 13, 9:54 AM CDT	Mesoscale Discussion	SPC	Angelina, Austin, Bastrop, Brazos, Burleson, Caldwell and 17 more	96 min
May 13, 10:20 AM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Clay, Cottle, Dickens, Foard and 10 more	115 min
May 13, 10:45 AM CDT	Severe Thunderstorm Watch	SPC	Archer, Baylor, Clay, Foard, Hardeman, Knox and 2 more	6 hr
May 13, 12:10 PM CDT	Tornado Watch	SPC	Angelina, Austin, Brazoria, Chambers, Colorado, Fayette and 22 more	6 hr
May 13, 12:26 PM CDT	Mesoscale Discussion	SPC	Bandera, Brown, Callahan, Coke, Coleman, Concho and 26 more	2 hr
May 13, 12:48 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Clay, Foard, Haskell, Knox and 4 more	117 min
May 13, 12:55 PM CDT	Tornado Watch	SPC	Brown, Callahan, Coleman, Concho, Eastland, Haskell and 14 more	6 hr
May 13, 1:38 PM CDT	Mesoscale Discussion	SPC	Austin, Brazoria, Chambers, Colorado, Fayette, Fort Bend and 15 more	97 min
May 13, 2:30 PM CDT	Tornado Watch	SPC	Atascosa, Bandera, Bastrop, Bexar, Caldwell, Comal and 21 more	6 hr
May 13, 2:48 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Clay, Haskell, Wichita	87 min
May 13, 3:34 PM CDT	Mesoscale Discussion	SPC	Atascosa, Bandera, Bastrop, Bexar, Caldwell, Comal and 21 more	86 min
May 13, 5:22 PM CDT	Mesoscale Discussion	SPC	Angelina, Austin, Brazoria, Chambers, Colorado, Fort Bend and 17 more	53 min
May 13, 5:54 PM CDT	Mesoscale Discussion	SPC	Brown, Callahan, Coleman, Concho, Eastland, Haskell and 14 more	96 min
May 13, 6:55 PM CDT	Severe Thunderstorm Watch	SPC	Bandera, Edwards, Gillespie, Kerr, Kimble, Mason and 6 more	5 hr

Nearby

Mesoscale Discussions in Texas, 2004 Every mesoscale discussion in 2004

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.