Alert archive / Oklahoma / Mesoscale Discussions in 2009

Mesoscale Discussion 814

May 13, 200920 counties in Kansas; 37 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at May 13, 2009, 3:21 PM CDT for 20 counties in Kansas; 37 counties in Oklahoma. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued: May 13, 2009, 3:21 PM CDT (20:21 UTC)
Expired: May 13, 2009, 4:45 PM CDT
In force: 84 min
Issued by: the Storm Prediction Center

All 57 counties

Allen County, KS, Anderson County, KS, Barber County, KS, Butler County, KS, Chase County, KS, Chautauqua County, KS, Cherokee County, KS, Coffey County, KS, Cowley County, KS, Crawford County, KS, Elk County, KS, Greenwood County, KS, Harper County, KS, Labette County, KS, Montgomery County, KS, Neosho County, KS, Sedgwick County, KS, Sumner County, KS, Wilson County, KS, Woodson County, KS, Alfalfa County, OK, Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Cleveland County, OK, Craig County, OK, Creek County, OK, Custer County, OK, Dewey County, OK, Garfield County, OK, Grady County, OK, Grant County, OK, Kay County, OK, Kingfisher County, OK, Kiowa County, OK, Lincoln County, OK, Logan County, OK, Major County, OK, Mayes County, OK, Noble County, OK, Nowata County, OK, Okfuskee County, OK, Oklahoma County, OK, Okmulgee County, OK, Osage County, OK, Pawnee County, OK, Payne County, OK, Pottawatomie County, OK, Roger Mills County, OK, Rogers County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK, Washita County, OK, Woods County, OK, Woodward County, OK

The radar

The Vance AFB radar (KVNX), 90 km from the middle of the area, began a volume at 20:19 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Lamont, OK (KLMN), launched 12:00Z, 8.4 hours before the alert went out and 40 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: 701 J/kg
Mixed-layer CIN: -565 J/kg
Mixed-layer LCL: 1492 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 329 m²/s²
0-3 km storm-relative helicity: 587 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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
May 13, 1:52 PM CDT	Mesoscale Discussion	SPC	Anderson, Bourbon, Crawford, Johnson, Linn, Miami and 1 more	23 min
May 13, 4:51 PM CDT	Severe Thunderstorm Watch	SPC	Allen, Anderson, Bourbon, Butler, Chautauqua, Cherokee and 19 more	6 hr
May 13, 6:30 PM CDT	Mesoscale Discussion	SPC	Allen, Anderson, Bourbon, Chautauqua, Cherokee, Cowley and 9 more	90 min
May 12, 8:16 PM CDT	Mesoscale Discussion	SPC	Beckham, Greer, Harmon, Jackson, Kiowa, Tillman	119 min
May 12, 8:43 PM CDT	Severe Thunderstorm Watch	SPC	Comanche, Cotton, Greer, Harmon, Jackson, Kiowa and 1 more	3 hr
May 13, 5:11 PM CDT	Severe Thunderstorm Watch	SPC	Alfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 33 more	6 hr
May 13, 5:53 PM CDT	Mesoscale Discussion	SPC	Jefferson	67 min

Nearby

Mesoscale Discussions in Oklahoma, 2009 Mesoscale Discussions in Kansas, 2009 Every mesoscale discussion in 2009

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.