Alert archive / Texas / Mesoscale Discussions in 2004

Mesoscale Discussion 274

April 6, 200418 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 6, 2004, 2:42 AM CDT for 18 counties in Texas. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued: Apr 6, 2004, 2:42 AM CDT (07:42 UTC)
Expired: Apr 6, 2004, 3:45 AM CDT
In force: 63 min
Issued by: the Storm Prediction Center

Counties Bandera County, TX, Bexar County, TX, Blanco County, TX, Burnet County, TX, Comal County, TX, Dimmit County, TX, Frio County, TX, Gillespie County, TX, Hays County, TX, Kendall County, TX, Kerr County, TX, Kinney County, TX, Maverick County, TX, Medina County, TX, Real County, TX, Travis County, TX, Uvalde County, TX, Zavala County, TX

The nearest sounding before it

Del Rio, TX (KDRT), launched 00:00Z, 7.7 hours before the alert went out and 96 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: 590 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 656 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 55 m²/s²
0-3 km storm-relative helicity: 168 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 3.1

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 5, 10:35 PM CDT	Severe Thunderstorm Watch	SPC	Bandera, Bexar, Blanco, Comal, Frio, Gillespie and 13 more	6 hr
Apr 5, 11:55 PM CDT	Mesoscale Discussion	SPC	Bandera, Blanco, Gillespie, Kendall, Kerr, Llano and 5 more	2 hr
Apr 6, 7:39 AM CDT	Mesoscale Discussion	SPC	Atascosa, Austin, Bee, Brazoria, Colorado, DeWitt and 14 more	66 min
Apr 6, 7:55 AM CDT	Tornado Watch	SPC	Aransas, Austin, Bee, Brazoria, Brazos, Burleson and 20 more	5 hr
Apr 6, 9:29 AM CDT	Mesoscale Discussion	SPC	Aransas, Austin, Bee, Brazoria, Brazos, Burleson and 20 more	91 min
Apr 6, 10:27 AM CDT	Mesoscale Discussion	SPC	Austin, Brazoria, Chambers, Colorado, Fort Bend, Galveston and 3 more	63 min
Apr 6, 11:05 AM CDT	Tornado Watch	SPC	Aransas, Austin, Bee, Brazoria, Calhoun, Chambers and 20 more	5 hr
Apr 6, 12:52 PM CDT	Mesoscale Discussion	SPC	Aransas, Austin, Bee, Brazoria, Calhoun, Chambers and 22 more	83 min
Apr 6, 2:19 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Childress, Clay, Cottle, Crosby and 22 more	116 min
Apr 6, 2:43 PM CDT	Mesoscale Discussion	SPC	Aransas, Bee, Calhoun, DeWitt, Galveston, Goliad and 9 more	62 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.