Alert archive / Oklahoma / Mesoscale Discussions in 2011

Mesoscale Discussion 2287

November 7, 201121 counties in Oklahoma; 20 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Nov 7, 2011, 7:52 AM CST for 21 counties in Oklahoma; 20 counties in Texas. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued: Nov 7, 2011, 7:52 AM CST (13:52 UTC)
Expired: Nov 7, 2011, 9:15 AM CST
In force: 83 min
Issued by: the Storm Prediction Center

All 41 counties

Alfalfa County, OK, Beckham County, OK, Blaine County, OK, Canadian County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Garfield County, OK, Greer County, OK, Harmon County, OK, Harper County, OK, Jackson County, OK, Kingfisher County, OK, Kiowa County, OK, Logan County, OK, Major County, OK, Noble County, OK, Roger Mills County, OK, Washita County, OK, Woods County, OK, Woodward County, OK, Armstrong County, TX, Briscoe County, TX, Carson County, TX, Childress County, TX, Collingsworth County, TX, Cottle County, TX, Donley County, TX, Gray County, TX, Hall County, TX, Hansford County, TX, Hardeman County, TX, Hemphill County, TX, Hutchinson County, TX, Lipscomb County, TX, Moore County, TX, Ochiltree County, TX, Potter County, TX, Roberts County, TX, Sherman County, TX, Wheeler County, TX

The radar

The Altus AFB radar (KFDR), 168 km from the middle of the area, began a volume at 13:51 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

Amarillo Airport, TX (KAMA), launched 12:00Z, 1.9 hours before the alert went out and 198 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: 1730 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 242 m²/s²
0-3 km storm-relative helicity: 351 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
Nov 6, 7:00 PM CST	Mesoscale Discussion	SPC	Carter, Garvin, Jefferson, Johnston, Love, Marshall and 2 more	90 min
Nov 7, 12:27 PM CST	Mesoscale Discussion	SPC	Beckham, Caddo, Comanche, Cotton, Custer, Greer and 6 more	93 min
Nov 7, 1:11 PM CST	Tornado Watch	SPC	Beckham, Blaine, Caddo, Canadian, Comanche, Cotton and 17 more	8 hr
Nov 7, 1:30 PM CST	Mesoscale Discussion	SPC	Alfalfa, Dewey, Garfield, Grant, Kay, Kingfisher and 4 more	2 hr
Nov 7, 4:58 PM CST	Mesoscale Discussion	SPC	Nowata, Osage, Washington	92 min
Nov 7, 5:37 PM CST	Tornado Watch	SPC	Craig, Nowata, Osage, Ottawa, Pawnee, Washington	7 hr
Nov 7, 5:51 PM CST	Mesoscale Discussion	SPC	Blaine, Caddo, Canadian, Comanche, Custer, Garfield and 10 more	114 min
Nov 7, 5:53 PM CST	Mesoscale Discussion	SPC	Love, Marshall	67 min
Nov 7, 2:41 PM CST	Mesoscale Discussion	SPC	Callahan, Coke, Coleman, Eastland, Fisher, Haskell and 9 more	94 min
Nov 7, 5:04 PM CST	Mesoscale Discussion	SPC	Armstrong, Carson, Castro, Deaf Smith, Gray, Hutchinson and 3 more	56 min

Nearby

Mesoscale Discussions in Oklahoma, 2011 Mesoscale Discussions in Texas, 2011 Every mesoscale discussion in 2011

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.