Alert archive / Texas / Mesoscale Discussions in 2003

Mesoscale Discussion 629

April 29, 200312 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 29, 2003, 8:19 PM CDT for 12 counties in Texas. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: Apr 29, 2003, 8:19 PM CDT (01:19 UTC)
Expired: Apr 29, 2003, 9:45 PM CDT
In force: 86 min
Issued by: the Storm Prediction Center

Counties Brooks County, TX, Cameron County, TX, Duval County, TX, Hidalgo County, TX, Jim Hogg County, TX, Jim Wells County, TX, Kenedy County, TX, Kleberg County, TX, Starr County, TX, Webb County, TX, Willacy County, TX, Zapata County, TX

The nearest sounding before it

Corpus Christi, TX (KCRP), launched 00:00Z, 1.3 hours before the alert went out and 152 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: 2110 J/kg
Mixed-layer CIN: -59 J/kg
Mixed-layer LCL: 728 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: -33 m²/s²
0-3 km storm-relative helicity: 13 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.4

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
Apr 29, 9:05 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Borden, Callahan, Childress, Coke and 44 more	85 min
Apr 29, 9:20 PM CDT	Severe Thunderstorm Watch	SPC	Archer, Brown, Clay, Comanche, Eastland, Erath and 13 more	3 hr
Apr 29, 11:16 PM CDT	Mesoscale Discussion	SPC	Bosque, Collin, Cooke, Coryell, Dallas, Denton and 7 more	119 min
Apr 30, 2:13 PM CDT	Mesoscale Discussion	SPC	Brown, Coleman, Concho, Edwards, Kimble, McCulloch and 4 more	92 min
Apr 30, 6:05 PM CDT	Severe Thunderstorm Watch	SPC	Archer, Baylor, Clay, Foard, Hardeman, Knox and 2 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.