Alert archive / Oklahoma / Mesoscale Discussions in 2012

Mesoscale Discussion 2031

October 12, 20129 counties in Kansas; 19 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Oct 12, 2012, 2:17 AM CDT for 9 counties in Kansas; 19 counties in Oklahoma. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued: Oct 12, 2012, 2:17 AM CDT (07:17 UTC)
Expired: Oct 12, 2012, 4:15 AM CDT
In force: 118 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 28 counties

Chautauqua County, KS, Cherokee County, KS, Cowley County, KS, Crawford County, KS, Elk County, KS, Labette County, KS, Montgomery County, KS, Neosho County, KS, Wilson County, KS, Alfalfa County, OK, Blaine County, OK, Craig County, OK, Dewey County, OK, Garfield County, OK, Grant County, OK, Kay County, OK, Kingfisher County, OK, Logan County, OK, Major County, OK, Mayes County, OK, Noble County, OK, Nowata County, OK, Osage County, OK, Ottawa County, OK, Pawnee County, OK, Payne County, OK, Rogers County, OK, Washington County, OK

The radar

The Vance AFB radar (KVNX), 95 km from the middle of the area, began a volume at 07:16 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, 7.3 hours before the alert went out and 37 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: 1400 J/kg
Mixed-layer CIN: -126 J/kg
Mixed-layer LCL: 1165 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 93 m²/s²
0-3 km storm-relative helicity: 205 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 0.9

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
Oct 12, 3:51 AM CDT	Mesoscale Discussion	SPC	Chautauqua, Cherokee, Cowley, Crawford, Elk, Harper and 5 more	2 hr
Oct 12, 5:37 PM CDT	Mesoscale Discussion	SPC	Caddo, Cleveland, Comanche, Grady, Greer, Harmon and 5 more	53 min

Nearby

Mesoscale Discussions in Oklahoma, 2012 Mesoscale Discussions in Kansas, 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.