Alert archive / Texas / Mesoscale Discussions in 2007

Mesoscale Discussion 747

May 7, 20077 counties in Oklahoma; 12 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 7, 2007, 7:15 PM CDT for 7 counties in Oklahoma; 12 counties in Texas. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: May 7, 2007, 7:15 PM CDT (00:15 UTC)
Expired: May 7, 2007, 8:15 PM CDT
In force: 60 min
Issued by: the Storm Prediction Center

Counties Atoka County, OK, Bryan County, OK, Carter County, OK, Choctaw County, OK, Johnston County, OK, Love County, OK, Marshall County, OK, Collin County, TX, Cooke County, TX, Delta County, TX, Fannin County, TX, Franklin County, TX, Grayson County, TX, Hopkins County, TX, Hunt County, TX, Lamar County, TX, Montague County, TX, Red River County, TX, Titus County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 149 km from the middle of the area, began a volume at 00:14 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 255May 7, 7:35 PM CDT

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 0.3 hours before the alert went out and 125 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: 2192 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 1136 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 27 m²/s²
0-3 km storm-relative helicity: 184 m²/s²
Significant tornado parameter: 0.5
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
May 7, 7:32 PM CDT	Tornado Watch	SPC	Atoka, Bryan, Carter, Choctaw, Coal, Garvin and 12 more	7 hr
May 7, 9:45 PM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Carter, Choctaw, Coal, Garvin and 12 more	60 min
May 8, 2:46 PM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Carter, Coal, Jefferson, Johnston and 4 more	2 hr
May 8, 3:41 PM CDT	Severe Thunderstorm Watch	SPC	Comanche, Cotton, Jackson, Jefferson, Kiowa, Stephens and 1 more	6 hr
May 8, 5:09 PM CDT	Mesoscale Discussion	SPC	Comanche, Cotton, Jackson, Jefferson, Kiowa, Stephens and 1 more	96 min
May 8, 5:29 PM CDT	Tornado Watch	SPC	Caddo, Comanche, Cotton, Grady, Jackson, Jefferson and 3 more	5 hr
May 7, 8:37 PM CDT	Severe Thunderstorm Watch	SPC	Andrews, Borden, Briscoe, Childress, Coke, Cottle and 38 more	7 hr
May 7, 9:23 PM CDT	Mesoscale Discussion	SPC	Bandera, Dimmit, Edwards, Frio, Kerr, Kinney and 8 more	67 min
May 7, 11:15 PM CDT	Mesoscale Discussion	SPC	Andrews, Borden, Cochran, Crosby, Dawson, Dickens and 12 more	60 min
May 7, 11:43 PM CDT	Mesoscale Discussion	SPC	Andrews, Borden, Cochran, Crosby, Dawson, Dickens and 17 more	62 min
May 8, 11:19 AM CDT	Mesoscale Discussion	SPC	Borden, Callahan, Coke, Crane, Ector, Fisher and 20 more	116 min
May 8, 12:01 PM CDT	Tornado Watch	SPC	Andrews, Borden, Brewster, Coke, Crane, Crockett and 27 more	7 hr
May 8, 2:44 PM CDT	Mesoscale Discussion	SPC	Coke, Crockett, Fisher, Glasscock, Irion, Mitchell and 6 more	91 min
May 8, 6:13 PM CDT	Mesoscale Discussion	SPC	Bandera, Edwards, Kerr, Kinney, Medina, Real and 2 more	62 min
May 8, 6:58 PM CDT	Severe Thunderstorm Watch	SPC	Bandera, Dimmit, Edwards, Gillespie, Kendall, Kerr and 8 more	4 hr

Nearby

Mesoscale Discussions in Texas, 2007 Mesoscale Discussions in Oklahoma, 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.