Alert archive / Texas / Mesoscale Discussions in 2008

Mesoscale Discussion 739

April 25, 200819 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 25, 2008, 9:39 PM CDT for 19 counties in Texas. It was in force for 66 min.

The area

The outline as issued.

The facts

Issued: Apr 25, 2008, 9:39 PM CDT (02:39 UTC)
Expired: Apr 25, 2008, 10:45 PM CDT
In force: 66 min
Issued by: the Storm Prediction Center

Counties Bandera County, TX, Bastrop County, TX, Blanco County, TX, Burnet County, TX, Comal County, TX, Edwards County, TX, Gillespie County, TX, Hays County, TX, Kendall County, TX, Kerr County, TX, Kimble County, TX, Kinney County, TX, Lee County, TX, Llano County, TX, Mason County, TX, Real County, TX, Travis County, TX, Uvalde County, TX, Williamson County, TX

The radar

The Austin/San Antonio radar (KEWX), 78 km from the middle of the area, began a volume at 02:41 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, 2.7 hours before the alert went out and 218 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: 2680 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 2144 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 52 m²/s²
0-3 km storm-relative helicity: 29 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.5

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 25, 7:02 PM CDT	Mesoscale Discussion	SPC	Bell, Williamson	88 min
Apr 25, 11:49 PM CDT	Mesoscale Discussion	SPC	Atascosa, Austin, Bastrop, Bexar, Burleson, Caldwell and 17 more	56 min
Apr 26, 2:11 AM CDT	Mesoscale Discussion	SPC	Aransas, Atascosa, Bee, Brazoria, Brooks, Calhoun and 25 more	94 min
Apr 26, 3:43 PM CDT	Mesoscale Discussion	SPC	Armstrong, Bailey, Borden, Briscoe, Carson, Castro and 31 more	2 hr
Apr 26, 5:46 PM CDT	Mesoscale Discussion	SPC	Coke, Concho, Crockett, Glasscock, Irion, Menard and 6 more	59 min
Apr 26, 6:04 PM CDT	Severe Thunderstorm Watch	SPC	Bandera, Baylor, Blanco, Borden, Brown, Callahan and 49 more	7 hr

Nearby

Mesoscale Discussions in Texas, 2008 Every mesoscale discussion in 2008

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.