Alert archive / Oklahoma / Mesoscale Discussions in 2009

Mesoscale Discussion 587

April 26, 200911 counties in Kansas; 36 counties in Oklahoma; 17 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 26, 2009, 5:44 PM CDT for 11 counties in Kansas; 36 counties in Oklahoma; 17 counties in Texas. It was in force for 61 min.

The area

The outline as issued.

The facts

Issued
Apr 26, 2009, 5:44 PM CDT (22:44 UTC)
Expired
Apr 26, 2009, 6:45 PM CDT
In force
61 min
Issued by
the Storm Prediction Center
All 64 counties

Barber County, KS, Butler County, KS, Cowley County, KS, Harper County, KS, Harvey County, KS, Kingman County, KS, Marion County, KS, McPherson County, KS, Reno County, KS, Sedgwick County, KS, Sumner County, KS, Alfalfa County, OK, Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Cleveland County, OK, Comanche County, OK, Cotton County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Grant County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Jefferson County, OK, Kay County, OK, Kingfisher County, OK, Kiowa County, OK, Lincoln County, OK, Logan County, OK, Major County, OK, McClain County, OK, Noble County, OK, Oklahoma County, OK, Payne County, OK, Pottawatomie County, OK, Roger Mills County, OK, Stephens County, OK, Tillman County, OK, Washita County, OK, Woods County, OK, Woodward County, OK, Archer County, TX, Baylor County, TX, Childress County, TX, Clay County, TX, Collingsworth County, TX, Cottle County, TX, Foard County, TX, Hardeman County, TX, Haskell County, TX, Hemphill County, TX, King County, TX, Knox County, TX, Stonewall County, TX, Throckmorton County, TX, Wheeler County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Vance AFB radar (KVNX), 132 km from the middle of the area, began a volume at 22:44 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

Norman, OK (KOUN), launched 12:00Z, 10.7 hours before the alert went out and 131 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-pSkew-T log-p diagram, Norman, OK at 12:00Z on 2009-04-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1610 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Norman, OK at 12:00Z on 2009-04-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 241 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1610 J/kg
Mixed-layer CIN
-31 J/kg
Mixed-layer LCL
547 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
241 m²/s²
0-3 km storm-relative helicity
326 m²/s²
Significant tornado parameter
2.1
Supercell composite
10.0

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.

IssuedProductOfficeCountiesLasted
Apr 25, 7:17 PM CDTMesoscale DiscussionSPCJohnson, Leavenworth, Wyandotte58 min
Apr 25, 9:58 PM CDTMesoscale DiscussionSPCAllen, Anderson, Butler, Chase, Chautauqua, Clay and 40 more92 min
Apr 25, 10:09 PM CDTSevere Thunderstorm WatchSPCAnderson, Atchison, Brown, Clay, Cloud, Coffey and 24 more6 hr
Apr 25, 10:39 PM CDTTornado WatchSPCAllen, Chautauqua, Cowley, Elk, Harper, Labette and 5 more4 hr
Apr 26, 1:28 AM CDTMesoscale DiscussionSPCAllen, Barber, Chautauqua, Cowley, Elk, Greenwood and 7 more92 min
Apr 26, 2:10 AM CDTMesoscale DiscussionSPCAnderson, Atchison, Brown, Clay, Coffey, Dickinson and 20 more95 min
Apr 26, 2:39 AM CDTTornado WatchSPCAllen, Chautauqua, Cowley, Elk, Harper, Labette and 5 more3 hr
Apr 26, 5:47 AM CDTMesoscale DiscussionSPCBarton, Dickinson, Edwards, Ellsworth, Ford, Lincoln and 8 more58 min
Apr 26, 5:58 AM CDTTornado WatchSPCBarton, Chase, Clark, Clay, Comanche, Dickinson and 24 more7 hr
Apr 26, 9:18 AM CDTMesoscale DiscussionSPCCloud, Jewell, Mitchell, Republic, Washington27 min
Apr 26, 10:19 AM CDTMesoscale DiscussionSPCBarber, Butler, Comanche, Cowley, Dickinson, Ellsworth and 14 more56 min
Apr 26, 10:54 AM CDTMesoscale DiscussionSPCAtchison, Barber, Barton, Butler, Chase, Chautauqua and 42 more66 min
Apr 26, 11:07 AM CDTTornado Watch PDSSPCBarber, Barton, Brown, Butler, Chase, Clark and 40 more7 hr
Apr 26, 12:27 PM CDTMesoscale DiscussionSPCBarton, Clark, Clay, Cloud, Edwards, Ellsworth and 12 more2 hr
Apr 26, 2:41 PM CDTMesoscale DiscussionSPCBarber, Brown, Butler, Chase, Clay, Cloud and 29 more3 hr
Apr 26, 5:02 PM CDTTornado WatchSPCAnderson, Atchison, Brown, Coffey, Doniphan, Douglas and 13 more6 hr
Apr 26, 6:14 PM CDTMesoscale DiscussionSPCAnderson, Atchison, Brown, Chase, Coffey, Doniphan and 16 more61 min
Apr 26, 6:16 PM CDTTornado Watch PDSSPCAllen, Barber, Butler, Chase, Chautauqua, Comanche and 16 more8 hr
Apr 26, 6:56 AM CDTMesoscale DiscussionSPCBeckham, Ellis, Harper, Roger Mills94 min
Apr 26, 12:58 PM CDTMesoscale DiscussionSPCHarmon, Jackson92 min
Apr 26, 1:37 PM CDTTornado Watch PDSSPCCaddo, Canadian, Carter, Cleveland, Comanche, Cotton and 21 more5 hr
Apr 26, 3:34 PM CDTMesoscale DiscussionSPCBeckham, Blaine, Caddo, Canadian, Cleveland, Comanche and 24 more116 min
Apr 26, 3:01 PM CDTTornado WatchSPCCallahan, Coke, Crockett, Fisher, Glasscock, Haskell and 18 more5 hr
Apr 26, 6:25 PM CDTMesoscale DiscussionSPCCallahan, Coke, Coleman, Concho, Crockett, Edwards and 25 more2 hr

Nearby

Mesoscale Discussions in Oklahoma, 2009Mesoscale Discussions in Texas, 2009Mesoscale Discussions in Kansas, 2009Every 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.