Alert archive / Texas / Mesoscale Discussions in 2007

Mesoscale Discussion 267

March 11, 200719 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 11, 2007, 10:18 AM CDT for 19 counties in Texas. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: Mar 11, 2007, 10:18 AM CDT (15:18 UTC)
Expired: Mar 11, 2007, 11:45 AM CDT
In force: 87 min
Issued by: the Storm Prediction Center

Counties Borden County, TX, Coke County, TX, Dawson County, TX, Garza County, TX, Glasscock County, TX, Howard County, TX, Irion County, TX, Lynn County, TX, Martin County, TX, Midland County, TX, Mitchell County, TX, Nolan County, TX, Reagan County, TX, Runnels County, TX, Schleicher County, TX, Scurry County, TX, Sterling County, TX, Terry County, TX, Tom Green County, TX

The radar

The San Angelo radar (KSJT), 96 km from the middle of the area, began a volume at 15:21 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 57Mar 11, 2:00 PM CDT

The nearest sounding before it

Midland Regional, TX (KMAF), launched 12:00Z, 3.3 hours before the alert went out and 100 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: 1106 J/kg
Mixed-layer CIN: -124 J/kg
Mixed-layer LCL: 862 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 137 m²/s²
0-3 km storm-relative helicity: 165 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 1.8

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
Mar 11, 3:29 AM CDT	Mesoscale Discussion	SPC	Clay, Wichita, Wilbarger	91 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
Mar 11, 5:27 PM CDT	Mesoscale Discussion	SPC	Concho, Crockett, Edwards, Irion, Kimble, Menard and 7 more	2 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.