Alert archive / Texas / Mesoscale Discussions in 2004

Mesoscale Discussion 277

April 6, 20049 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 6, 2004, 10:27 AM CDT for 9 counties in Texas. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued: Apr 6, 2004, 10:27 AM CDT (15:27 UTC)
Expired: Apr 6, 2004, 11:30 AM CDT
In force: 63 min
Issued by: the Storm Prediction Center

Counties Austin County, TX, Brazoria County, TX, Chambers County, TX, Colorado County, TX, Fort Bend County, TX, Galveston County, TX, Harris County, TX, Jefferson County, TX, Orange County, TX

The radar

The Houston radar (KHGX), 1 km from the middle of the area, began a volume at 15:28 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.

Tornado Watch 47Apr 6, 11:05 AM CDT

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 3.5 hours before the alert went out and 195 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 847 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 113 m²/s²
0-3 km storm-relative helicity: 118 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
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, 2:42 AM CDT	Mesoscale Discussion	SPC	Bandera, Bexar, Blanco, Burnet, Comal, Dimmit and 12 more	63 min
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, 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; radar from the NEXRAD Level II archive.