Alert archive / Oklahoma / Mesoscale Discussions in 2024

Mesoscale Discussion 539

April 27, 20246 counties in Kansas; 26 counties in Oklahoma; 9 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 27, 2024, 10:57 AM CDT for 6 counties in Kansas; 26 counties in Oklahoma; 9 counties in Texas. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued: Apr 27, 2024, 10:57 AM CDT (15:57 UTC)
Expired: Apr 27, 2024, 12:30 PM CDT
In force: 93 min
Issued by: the Storm Prediction Center
Concerning: Tornado watch 144

All 41 counties

Chautauqua County, KS, Cowley County, KS, Elk County, KS, Montgomery County, KS, Sumner County, KS, Wilson County, KS, Alfalfa County, OK, Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Comanche County, OK, Custer County, OK, Dewey County, OK, Garfield County, OK, Grant County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Kay County, OK, Kingfisher County, OK, Kiowa County, OK, Logan County, OK, Major County, OK, Noble County, OK, Oklahoma County, OK, Osage County, OK, Pawnee County, OK, Payne County, OK, Tillman County, OK, Washington County, OK, Washita County, OK, Baylor County, TX, Childress County, TX, Cottle County, TX, Foard County, TX, Hardeman County, TX, King County, TX, Knox County, TX, Stonewall County, TX, Wilbarger County, TX

The radar

The Norman radar (KTLX), 78 km from the middle of the area, began a volume at 15:56 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, 4.0 hours before the alert went out and 77 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: 2248 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 528 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 227 m²/s²
0-3 km storm-relative helicity: 190 m²/s²
Significant tornado parameter: 2.2
Supercell composite: 11.5

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 27, 11:33 AM CDT	Mesoscale Discussion	SPC	Atchison, Barton, Brown, Clay, Dickinson, Doniphan and 16 more	117 min
Apr 27, 11:51 AM CDT	Tornado Watch	SPC	Anderson, Barber, Barton, Brown, Butler, Chase and 43 more	8 hr
Apr 27, 1:15 PM CDT	Mesoscale Discussion	SPC	Ellis, Finney, Gove, Graham, Greeley, Hamilton and 13 more	3 hr
Apr 27, 1:40 PM CDT	Tornado Watch	SPC	Atchison, Doniphan, Leavenworth, Wyandotte	7 hr
Apr 27, 1:54 PM CDT	Mesoscale Discussion	SPC	Allen, Bourbon, Chautauqua, Cherokee, Cowley, Crawford and 7 more	96 min
Apr 27, 2:54 PM CDT	Severe Thunderstorm Watch	SPC	Ellis, Finney, Gove, Graham, Greeley, Hamilton and 17 more	6 hr
Apr 27, 3:40 PM CDT	Mesoscale Discussion	SPC	Anderson, Atchison, Brown, Doniphan, Douglas, Franklin and 8 more	95 min
Apr 27, 4:31 PM CDT	Mesoscale Discussion	SPC	Allen, Anderson, Bourbon, Cherokee, Crawford, Johnson and 6 more	59 min
Apr 27, 4:57 PM CDT	Tornado Watch	SPC	Allen, Bourbon, Chautauqua, Cherokee, Crawford, Elk and 10 more	8 hr
Apr 27, 5:29 AM CDT	Mesoscale Discussion	SPC	Alfalfa, Beckham, Blaine, Caddo, Canadian, Comanche and 12 more	91 min
Apr 27, 6:27 AM CDT	Tornado Watch	SPC	Alfalfa, Beckham, Blaine, Custer, Dewey, Ellis and 13 more	7 hr
Apr 27, 9:24 AM CDT	Mesoscale Discussion	SPC	Beckham, Blaine, Caddo, Canadian, Custer, Dewey and 8 more	96 min
Apr 27, 1:10 PM CDT	Tornado Watch PDS	SPC	Alfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 27 more	7 hr
Apr 27, 1:13 PM CDT	Mesoscale Discussion	SPC	Blaine, Caddo, Canadian, Comanche, Cotton, Custer and 14 more	92 min
Apr 27, 3:19 PM CDT	Mesoscale Discussion	SPC	Comanche, Cotton, Jefferson, Stephens, Tillman	86 min
Apr 27, 5:51 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Beckham, Blaine, Caddo, Canadian, Comanche and 23 more	84 min
Apr 26, 8:14 PM CDT	Mesoscale Discussion	SPC	Bowie, Camp, Cass, Morris, Titus, Upshur and 1 more	2 hr

Nearby

Mesoscale Discussions in Oklahoma, 2024 Mesoscale Discussions in Texas, 2024 Mesoscale Discussions in Kansas, 2024 Every mesoscale discussion in 2024

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.