Alert archive / Oklahoma / Mesoscale Discussions in 2009

Mesoscale Discussion 573

April 26, 200913 counties in Kansas; 19 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Apr 26, 2009, 1:28 AM CDT for 13 counties in Kansas; 19 counties in Oklahoma. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: Apr 26, 2009, 1:28 AM CDT (06:28 UTC)
Expired: Apr 26, 2009, 3:00 AM CDT
In force: 92 min
Issued by: the Storm Prediction Center

All 32 counties

Allen County, KS, Barber County, KS, Chautauqua County, KS, Cowley County, KS, Elk County, KS, Greenwood County, KS, Harper County, KS, Labette County, KS, Montgomery County, KS, Neosho County, KS, Sumner County, KS, Wilson County, KS, Woodson County, KS, Alfalfa County, OK, Blaine County, OK, Craig County, OK, Custer County, OK, Dewey County, OK, Garfield County, OK, Grant County, OK, Kay County, OK, Kingfisher County, OK, Logan County, OK, Major County, OK, Noble County, OK, Nowata County, OK, Osage County, OK, Pawnee County, OK, Payne County, OK, Washington County, OK, Woods County, OK, Woodward County, OK

The radar

The Vance AFB radar (KVNX), 27 km from the middle of the area, began a volume at 06:31 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.

Tornado Watch 187Apr 26, 2:40 AM CDT

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 6.5 hours before the alert went out and 159 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: 1154 J/kg
Mixed-layer CIN: -44 J/kg
Mixed-layer LCL: 1359 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 89 m²/s²
0-3 km storm-relative helicity: 200 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 9.7

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 25, 7:17 PM CDT	Mesoscale Discussion	SPC	Johnson, Leavenworth, Wyandotte	58 min
Apr 25, 9:58 PM CDT	Mesoscale Discussion	SPC	Allen, Anderson, Butler, Chase, Chautauqua, Clay and 40 more	92 min
Apr 25, 10:09 PM CDT	Severe Thunderstorm Watch	SPC	Anderson, Atchison, Brown, Clay, Cloud, Coffey and 24 more	6 hr
Apr 25, 10:39 PM CDT	Tornado Watch	SPC	Allen, Chautauqua, Cowley, Elk, Harper, Labette and 5 more	4 hr
Apr 26, 2:10 AM CDT	Mesoscale Discussion	SPC	Anderson, Atchison, Brown, Clay, Coffey, Dickinson and 20 more	95 min
Apr 26, 2:39 AM CDT	Tornado Watch	SPC	Allen, Chautauqua, Cowley, Elk, Harper, Labette and 5 more	3 hr
Apr 26, 5:47 AM CDT	Mesoscale Discussion	SPC	Barton, Dickinson, Edwards, Ellsworth, Ford, Lincoln and 8 more	58 min
Apr 26, 5:58 AM CDT	Tornado Watch	SPC	Barton, Chase, Clark, Clay, Comanche, Dickinson and 24 more	7 hr
Apr 26, 9:18 AM CDT	Mesoscale Discussion	SPC	Cloud, Jewell, Mitchell, Republic, Washington	27 min
Apr 26, 10:19 AM CDT	Mesoscale Discussion	SPC	Barber, Butler, Comanche, Cowley, Dickinson, Ellsworth and 14 more	56 min
Apr 26, 10:54 AM CDT	Mesoscale Discussion	SPC	Atchison, Barber, Barton, Butler, Chase, Chautauqua and 42 more	66 min
Apr 26, 11:07 AM CDT	Tornado Watch PDS	SPC	Barber, Barton, Brown, Butler, Chase, Clark and 40 more	7 hr
Apr 26, 12:27 PM CDT	Mesoscale Discussion	SPC	Barton, Clark, Clay, Cloud, Edwards, Ellsworth and 12 more	2 hr
Apr 26, 2:41 PM CDT	Mesoscale Discussion	SPC	Barber, Brown, Butler, Chase, Clay, Cloud and 29 more	3 hr
Apr 26, 5:02 PM CDT	Tornado Watch	SPC	Anderson, Atchison, Brown, Coffey, Doniphan, Douglas and 13 more	6 hr
Apr 26, 5:44 PM CDT	Mesoscale Discussion	SPC	Barber, Butler, Cowley, Harper, Harvey, Kingman and 5 more	61 min
Apr 26, 6:14 PM CDT	Mesoscale Discussion	SPC	Anderson, Atchison, Brown, Chase, Coffey, Doniphan and 16 more	61 min
Apr 26, 6:16 PM CDT	Tornado Watch PDS	SPC	Allen, Barber, Butler, Chase, Chautauqua, Comanche and 16 more	8 hr
Apr 26, 6:56 AM CDT	Mesoscale Discussion	SPC	Beckham, Ellis, Harper, Roger Mills	94 min
Apr 26, 12:58 PM CDT	Mesoscale Discussion	SPC	Harmon, Jackson	92 min
Apr 26, 1:37 PM CDT	Tornado Watch PDS	SPC	Caddo, Canadian, Carter, Cleveland, Comanche, Cotton and 21 more	5 hr
Apr 26, 3:34 PM CDT	Mesoscale Discussion	SPC	Beckham, Blaine, Caddo, Canadian, Cleveland, Comanche and 24 more	116 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.