Alert archive / Oklahoma / Mesoscale Discussions in 2007

Mesoscale Discussion 719

May 6, 200715 counties in Oklahoma; 4 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 6, 2007, 3:37 AM CDT for 15 counties in Oklahoma; 4 counties in Texas. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued: May 6, 2007, 3:37 AM CDT (08:37 UTC)
Expired: May 6, 2007, 4:30 AM CDT
In force: 53 min
Issued by: the Storm Prediction Center

Counties Alfalfa County, OK, Beckham County, OK, Blaine County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Greer County, OK, Harmon County, OK, Harper County, OK, Kiowa County, OK, Major County, OK, Roger Mills County, OK, Washita County, OK, Woods County, OK, Woodward County, OK, Collingsworth County, TX, Donley County, TX, Hemphill County, TX, Wheeler County, TX

The radar

The Vance AFB radar (KVNX), 143 km from the middle of the area, began a volume at 08:39 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

Lamont, OK (KLMN), launched 00:00Z, 8.6 hours before the alert went out and 190 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: 3637 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 577 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 125 m²/s²
0-3 km storm-relative helicity: 180 m²/s²
Significant tornado parameter: 3.3
Supercell composite: 14.4

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 5, 7:34 PM CDT	Mesoscale Discussion	SPC	Tillman	56 min
May 5, 7:48 PM CDT	Tornado Watch	SPC	Comanche, Jackson, Tillman	7 hr
May 5, 9:58 PM CDT	Tornado Watch	SPC	Alfalfa, Beaver, Beckham, Blaine, Custer, Dewey and 12 more	7 hr
May 5, 11:24 PM CDT	Mesoscale Discussion	SPC	Beaver, Ellis, Harper, Roger Mills, Woods, Woodward	66 min
May 6, 7:50 AM CDT	Mesoscale Discussion	SPC	Alfalfa, Beckham, Custer, Dewey, Greer, Harmon and 4 more	85 min
May 6, 9:19 AM CDT	Tornado Watch	SPC	Alfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 37 more	5 hr
May 6, 11:41 AM CDT	Mesoscale Discussion	SPC	Alfalfa, Beckham, Blaine, Caddo, Canadian, Cherokee and 43 more	94 min
May 6, 1:47 PM CDT	Mesoscale Discussion	SPC	Beckham, Ellis, Greer, Harmon, Harper, Jackson and 3 more	58 min
May 6, 1:59 PM CDT	Tornado Watch	SPC	Alfalfa, Beaver, Beckham, Blaine, Caddo, Canadian and 36 more	8 hr
May 6, 2:36 PM CDT	Tornado Watch	SPC	Brown, Callahan, Coke, Coleman, Concho, Crockett and 23 more	7 hr

Nearby

Mesoscale Discussions in Oklahoma, 2007 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.