Alert archive / Oklahoma / Mesoscale Discussions in 2012

Mesoscale Discussion 1994

September 26, 201225 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Sep 26, 2012, 7:17 PM CDT for 25 counties in Oklahoma. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued: Sep 26, 2012, 7:17 PM CDT (00:17 UTC)
Expired: Sep 26, 2012, 8:15 PM CDT
In force: 58 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 25 counties

Alfalfa County, OK, Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Comanche County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Garfield County, OK, Grady 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, Oklahoma County, OK, Roger Mills County, OK, Washita County, OK, Woods County, OK, Woodward County, OK

The radar

The Vance AFB radar (KVNX), 134 km from the middle of the area, began a volume at 00:20 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

Norman, OK (KOUN), launched 00:00Z, 0.3 hours before the alert went out and 138 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: 2226 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 1605 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 33 m²/s²
0-3 km storm-relative helicity: 108 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 5.1

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
Sep 26, 8:08 PM CDT	Mesoscale Discussion	SPC	Creek, Haskell, Hughes, Latimer, LeFlore, Lincoln and 7 more	97 min
Sep 26, 10:29 PM CDT	Mesoscale Discussion	SPC	Beaver, Ellis, Harper, Woodward	61 min
Sep 27, 3:09 PM CDT	Mesoscale Discussion	SPC	Cimarron	66 min
Sep 27, 5:59 PM CDT	Severe Thunderstorm Watch	SPC	Cimarron, Texas	7 hr

Nearby

Mesoscale Discussions in Oklahoma, 2012 Every mesoscale discussion in 2012

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.