Alert archive / Texas / Mesoscale Discussions in 2003

Mesoscale Discussion 1781

July 11, 200320 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Jul 11, 2003, 6:15 PM CDT for 20 counties in Texas. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: Jul 11, 2003, 6:15 PM CDT (23:15 UTC)
Expired: Jul 11, 2003, 7:15 PM CDT
In force: 60 min
Issued by: the Storm Prediction Center

Counties Bastrop County, TX, Bell County, TX, Brazos County, TX, Burleson County, TX, Burnet County, TX, Caldwell County, TX, Coryell County, TX, Falls County, TX, Grimes County, TX, Hays County, TX, Lampasas County, TX, Lee County, TX, Limestone County, TX, Madison County, TX, McLennan County, TX, Milam County, TX, Navarro County, TX, Robertson County, TX, Travis County, TX, Williamson County, TX

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 11.3 hours before the alert went out and 206 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: 1465 J/kg
Mixed-layer CIN: -159 J/kg
Mixed-layer LCL: 1221 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 82 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Jul 11, 11:46 AM CDT	Mesoscale Discussion	SPC	Angelina, Austin, Brazos, Chambers, Fort Bend, Grimes and 15 more	119 min
Jul 11, 2:00 PM CDT	Severe Thunderstorm Watch	SPC	Bastrop, Bell, Brazos, Burleson, Burnet, Caldwell and 14 more	5 hr
Jul 11, 4:38 PM CDT	Mesoscale Discussion	SPC	Armstrong, Bailey, Briscoe, Carson, Castro, Collingsworth and 22 more	97 min
Jul 11, 5:25 PM CDT	Severe Thunderstorm Watch	SPC	Armstrong, Bailey, Carson, Castro, Cochran, Dallam and 17 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.