Alert archive / Texas / Mesoscale Discussions in 2007

Mesoscale Discussion 177

February 23, 200719 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Feb 23, 2007, 1:54 PM CST for 19 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Feb 23, 2007, 1:54 PM CST (19:54 UTC)
Expired: Feb 23, 2007, 4:00 PM CST
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Borden County, TX, Briscoe County, TX, Childress County, TX, Collingsworth County, TX, Cottle County, TX, Crosby County, TX, Dickens County, TX, Donley County, TX, Fisher County, TX, Floyd County, TX, Garza County, TX, Hall County, TX, Howard County, TX, Kent County, TX, King County, TX, Mitchell County, TX, Motley County, TX, Scurry County, TX, Stonewall County, TX

The radar

The Lubbock radar (KLBB), 89 km from the middle of the area, began a volume at 19:52 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 27Feb 23, 3:10 PM CST

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 12:00Z, 7.9 hours before the alert went out and 182 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 3061 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 126 m²/s²
0-3 km storm-relative helicity: 116 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Feb 23, 3:11 PM CST	Tornado Watch	SPC	Armstrong, Briscoe, Carson, Childress, Collingsworth, Cottle and 21 more	7 hr
Feb 23, 5:51 PM CST	Mesoscale Discussion	SPC	Borden, Coke, Concho, Crockett, Dawson, Fisher and 17 more	114 min

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.