Alert archive / Texas / Mesoscale Discussions in 2004

Mesoscale Discussion 267

April 4, 200425 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 4, 2004, 5:32 PM CDT for 25 counties in Texas. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued: Apr 4, 2004, 5:32 PM CDT (22:32 UTC)
Expired: Apr 4, 2004, 7:30 PM CDT
In force: 118 min
Issued by: the Storm Prediction Center

All 25 counties

Atascosa County, TX, Austin County, TX, Bastrop County, TX, Bee County, TX, Bexar County, TX, Burleson County, TX, Caldwell County, TX, Colorado County, TX, Comal County, TX, DeWitt County, TX, Duval County, TX, Fayette County, TX, Gonzales County, TX, Guadalupe County, TX, Hays County, TX, Karnes County, TX, La Salle County, TX, Lavaca County, TX, Lee County, TX, Live Oak County, TX, McMullen County, TX, Waller County, TX, Washington County, TX, Webb County, TX, Wilson County, TX

The radar

The Austin/San Antonio radar (KEWX), 101 km from the middle of the area, began a volume at 22:32 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.

Severe Thunderstorm Watch 43Apr 4, 6:40 PM CDT

The nearest sounding before it

Corpus Christi, TX (KCRP), launched 12:00Z, 10.5 hours before the alert went out and 169 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: 1090 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 628 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 36 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.3

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 4, 4:40 AM CDT	Mesoscale Discussion	SPC	Crane, Crockett, Culberson, Ector, Jeff Davis, Kinney and 8 more	3 hr
Apr 4, 11:38 AM CDT	Mesoscale Discussion	SPC	Brooks, Cameron, Dimmit, Duval, Hidalgo, Jim Hogg and 9 more	3 hr
Apr 4, 12:41 PM CDT	Mesoscale Discussion	SPC	Atascosa, Bexar, Caldwell, DeWitt, Dimmit, Frio and 7 more	3 hr
Apr 4, 1:10 PM CDT	Severe Thunderstorm Watch	SPC	Atascosa, Dimmit, Duval, Frio, Jim Wells, Karnes and 8 more	6 hr
Apr 4, 1:23 PM CDT	Mesoscale Discussion	SPC	Brewster, Terrell, Val Verde	2 hr
Apr 4, 2:10 PM CDT	Severe Thunderstorm Watch	SPC	Brewster, Presidio, Terrell	6 hr
Apr 4, 3:30 PM CDT	Mesoscale Discussion	SPC	Atascosa, Duval, Jim Wells, Karnes, La Salle, Live Oak and 3 more	2 hr
Apr 4, 6:40 PM CDT	Severe Thunderstorm Watch	SPC	Aransas, Atascosa, Bee, Brooks, Duval, Goliad and 15 more	4 hr

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.