Alert archive / Texas / Mesoscale Discussions in 2004

Mesoscale Discussion 490

April 28, 200418 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 28, 2004, 9:56 PM CDT for 18 counties in Texas. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Apr 28, 2004, 9:56 PM CDT (02:56 UTC)
Expired: Apr 28, 2004, 11:30 PM CDT
In force: 94 min
Issued by: the Storm Prediction Center

Counties Atascosa County, TX, Bandera County, TX, Brooks County, TX, Dimmit County, TX, Duval County, TX, Edwards County, TX, Frio County, TX, Jim Hogg County, TX, Kinney County, TX, La Salle County, TX, Maverick County, TX, McMullen County, TX, Medina County, TX, Real County, TX, Uvalde County, TX, Webb County, TX, Zapata County, TX, Zavala County, TX

The nearest sounding before it

Del Rio, TX (KDRT), launched 00:00Z, 2.9 hours before the alert went out and 120 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: 850 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 912 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 97 m²/s²
0-3 km storm-relative helicity: 198 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 5.8

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 28, 7:07 PM CDT	Mesoscale Discussion	SPC	Bandera, Dimmit, Edwards, Frio, Kerr, Kinney and 8 more	83 min
Apr 28, 7:25 PM CDT	Severe Thunderstorm Watch	SPC	Bandera, Brooks, Crockett, Dimmit, Duval, Edwards and 17 more	6 hr
Apr 29, 4:12 AM CDT	Mesoscale Discussion	SPC	Austin, Bastrop, Brazos, Burleson, Colorado, DeWitt and 18 more	3 hr
Apr 29, 1:10 PM CDT	Tornado Watch	SPC	Shelby	6 hr
Apr 29, 1:49 PM CDT	Mesoscale Discussion	SPC	Baylor, Childress, Collingsworth, Cottle, Foard, Hall and 4 more	116 min
Apr 29, 3:05 PM CDT	Severe Thunderstorm Watch	SPC	Childress, Collingsworth, Cottle, Crosby, Dickens, Foard and 7 more	7 hr
Apr 29, 3:58 PM CDT	Mesoscale Discussion	SPC	Borden, Coke, Crockett, Fisher, Glasscock, Howard and 15 more	2 hr
Apr 29, 5:10 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Callahan, Clay, Coke, Coleman and 18 more	95 min
Apr 29, 5:35 PM CDT	Severe Thunderstorm Watch	SPC	Archer, Baylor, Callahan, Clay, Fisher, Haskell and 10 more	5 hr
Apr 29, 6:35 PM CDT	Mesoscale Discussion	SPC	Childress, Collingsworth, Cottle, Crosby, Dickens, Foard and 7 more	85 min

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.