Alert archive / Texas / Mesoscale Discussions in 2007

Mesoscale Discussion 485

April 13, 200734 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 13, 2007, 9:54 PM CDT for 34 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Apr 13, 2007, 9:54 PM CDT (02:54 UTC)
Expired: Apr 14, 2007, 12:00 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 34 counties

Atascosa County, TX, Bandera County, TX, Bastrop County, TX, Bexar County, TX, Blanco County, TX, Burnet County, TX, Caldwell County, TX, Colorado County, TX, Comal County, TX, DeWitt County, TX, Fayette County, TX, Frio County, TX, Gillespie County, TX, Goliad County, TX, Gonzales County, TX, Guadalupe County, TX, Hays County, TX, Karnes County, TX, Kendall County, TX, Kerr County, TX, Kimble County, TX, Kinney County, TX, Lavaca County, TX, Lee County, TX, Llano County, TX, Mason County, TX, Maverick County, TX, Medina County, TX, Real County, TX, Travis County, TX, Uvalde County, TX, Williamson County, TX, Wilson County, TX, Zavala County, TX

The radar

The Austin/San Antonio radar (KEWX), 43 km from the middle of the area, began a volume at 02:58 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 nearest sounding before it

Del Rio, TX (KDRT), launched 00:00Z, 2.9 hours before the alert went out and 231 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: 815 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 2843 m above ground
0-6 km bulk shear: 72 kt
0-1 km storm-relative helicity: 59 m²/s²
0-3 km storm-relative helicity: 136 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.8

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 13, 8:42 PM CDT	Mesoscale Discussion	SPC	Anderson, Angelina, Austin, Bell, Bosque, Bowie and 80 more	2 hr
Apr 14, 1:41 AM CDT	Tornado Watch	SPC	Jasper, Newton	6 hr

Nearby

Mesoscale Discussions in Texas, 2007 Every mesoscale discussion in 2007

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.