Alert archive / Texas / Mesoscale Discussions in 2007

Mesoscale Discussion 270

March 11, 200713 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 11, 2007, 5:27 PM CDT for 13 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Mar 11, 2007, 5:27 PM CDT (22:27 UTC)
Expired: Mar 11, 2007, 7:30 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Concho County, TX, Crockett County, TX, Edwards County, TX, Irion County, TX, Kimble County, TX, Menard County, TX, Reagan County, TX, Real County, TX, Schleicher County, TX, Sutton County, TX, Terrell County, TX, Tom Green County, TX, Val Verde County, TX

The radar

The San Angelo radar (KSJT), 99 km from the middle of the area, began a volume at 22:28 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 nearest sounding before it

Del Rio, TX (KDRT), launched 12:00Z, 10.5 hours before the alert went out and 128 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: 449 J/kg
Mixed-layer CIN: -247 J/kg
Mixed-layer LCL: 575 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 109 m²/s²
0-3 km storm-relative helicity: 126 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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
Mar 11, 3:29 AM CDT	Mesoscale Discussion	SPC	Clay, Wichita, Wilbarger	91 min
Mar 11, 10:18 AM CDT	Mesoscale Discussion	SPC	Borden, Coke, Dawson, Garza, Glasscock, Howard and 13 more	87 min
Mar 11, 1:58 PM CDT	Tornado Watch	SPC	Brewster, Coke, Crane, Crockett, Edwards, Irion and 13 more	7 hr
Mar 11, 2:25 PM CDT	Mesoscale Discussion	SPC	Archer, Clay, Collin, Cooke, Denton, Fannin and 10 more	95 min
Mar 11, 4:50 PM CDT	Mesoscale Discussion	SPC	Bandera, Bell, Bexar, Blanco, Bosque, Brown and 33 more	85 min
Mar 11, 5:16 PM CDT	Tornado Watch	SPC	Atascosa, Bandera, Bell, Bexar, Blanco, Brown and 37 more	8 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.