Alert archive / Oklahoma / Mesoscale Discussions in 2013

Mesoscale Discussion 550

April 22, 20138 counties in Kansas; 18 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Apr 22, 2013, 7:48 PM CDT for 8 counties in Kansas; 18 counties in Oklahoma. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: Apr 22, 2013, 7:48 PM CDT (00:48 UTC)
Expired: Apr 22, 2013, 9:15 PM CDT
In force: 87 min
Issued by: the Storm Prediction Center

All 26 counties

Barber County, KS, Butler County, KS, Comanche County, KS, Cowley County, KS, Harper County, KS, Kingman County, KS, Sedgwick County, KS, Sumner County, KS, Alfalfa County, OK, Beckham County, OK, Blaine County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Garfield County, OK, Grant County, OK, Harper County, OK, Kay County, OK, Kingfisher County, OK, Logan County, OK, Major County, OK, Noble County, OK, Payne County, OK, Roger Mills County, OK, Woods County, OK, Woodward County, OK

The radar

The Vance AFB radar (KVNX), 36 km from the middle of the area, began a volume at 00:47 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, 0.8 hours before the alert went out and 58 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: 564 J/kg
Mixed-layer CIN: -62 J/kg
Mixed-layer LCL: 1490 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 60 m²/s²
0-3 km storm-relative helicity: 92 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.6

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
Apr 22, 9:25 PM CDT	Mesoscale Discussion	SPC	Butler, Cowley, Sumner	95 min
Apr 22, 11:15 PM CDT	Mesoscale Discussion	SPC	Canadian, Oklahoma	60 min

Nearby

Mesoscale Discussions in Oklahoma, 2013 Mesoscale Discussions in Kansas, 2013 Every mesoscale discussion in 2013

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.