Alert archive / Texas / Mesoscale Discussions in 2019

Mesoscale Discussion 698

May 20, 20195 counties in Oklahoma; 40 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 20, 2019, 10:41 AM CDT for 5 counties in Oklahoma; 40 counties in Texas. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: May 20, 2019, 10:41 AM CDT (15:41 UTC)
Expired: May 20, 2019, 1:15 PM CDT
In force: 3 hr
Issued by: the Storm Prediction Center
Chance of a watch: 95%

All 45 counties

Beckham County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Roger Mills County, OK, Armstrong County, TX, Borden County, TX, Briscoe County, TX, Carson County, TX, Castro County, TX, Childress County, TX, Collingsworth County, TX, Cottle County, TX, Crosby County, TX, Dawson County, TX, Dickens County, TX, Donley County, TX, Fisher County, TX, Floyd County, TX, Foard County, TX, Garza County, TX, Gray County, TX, Hale County, TX, Hall County, TX, Hardeman County, TX, Hemphill County, TX, Hockley County, TX, Howard County, TX, Hutchinson County, TX, Kent County, TX, King County, TX, Lamb County, TX, Lubbock County, TX, Lynn County, TX, Martin County, TX, Mitchell County, TX, Motley County, TX, Potter County, TX, Randall County, TX, Roberts County, TX, Scurry County, TX, Stonewall County, TX, Swisher County, TX, Terry County, TX, Wheeler County, TX

The radar

The Lubbock radar (KLBB), 89 km from the middle of the area, began a volume at 15:41 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

Amarillo Airport, TX (KAMA), launched 12:00Z, 3.7 hours before the alert went out and 154 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: 812 J/kg
Mixed-layer CIN: -146 J/kg
Mixed-layer LCL: 637 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 404 m²/s²
0-3 km storm-relative helicity: 461 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 7.5

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
May 19, 11:56 PM CDT	Mesoscale Discussion	SPC	Cimarron	2 hr
May 20, 1:57 AM CDT	Severe Thunderstorm Watch	SPC	Beaver, Cimarron, Texas	8 hr
May 20, 6:14 AM CDT	Mesoscale Discussion	SPC	Alfalfa, Blaine, Custer, Dewey, Ellis, Garfield and 7 more	2 hr
May 20, 7:09 AM CDT	Severe Thunderstorm Watch	SPC	Alfalfa, Blaine, Custer, Dewey, Ellis, Garfield and 11 more	6 hr
May 20, 11:17 AM CDT	Mesoscale Discussion	SPC	Beckham, Blaine, Caddo, Canadian, Carter, Cleveland and 20 more	2 hr
May 20, 11:35 AM CDT	Mesoscale Discussion	SPC	Alfalfa, Blaine, Creek, Custer, Dewey, Ellis and 20 more	85 min
May 20, 1:21 PM CDT	Mesoscale Discussion	SPC	Caddo, Canadian, Cleveland, Comanche, Grady, Kiowa and 3 more	24 min
May 20, 1:37 PM CDT	Tornado Watch PDS	SPC	Atoka, Beckham, Blaine, Bryan, Caddo, Canadian and 41 more	8 hr
May 20, 2:15 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Beaver, Cimarron, Ellis, Grant, Harper and 3 more	90 min
May 20, 3:46 PM CDT	Mesoscale Discussion	SPC	Canadian, Greer, Harmon, Jackson, Kingfisher, Kiowa and 1 more	59 min
May 20, 4:35 PM CDT	Mesoscale Discussion	SPC	Adair, Cherokee, Craig, Delaware, Mayes, Ottawa and 2 more	115 min
May 20, 5:14 PM CDT	Tornado Watch	SPC	Adair, Cherokee, Craig, Delaware, Haskell, Latimer and 11 more	8 hr
May 20, 5:44 PM CDT	Mesoscale Discussion	SPC	Canadian, Greer, Harmon, Jackson, Kingfisher, Kiowa and 1 more	61 min
May 19, 7:21 PM CDT	Mesoscale Discussion	SPC	Harrison, Panola	84 min
May 20, 12:36 PM CDT	Tornado Watch PDS	SPC	Armstrong, Borden, Briscoe, Childress, Collingsworth, Cottle and 34 more	9 hr
May 20, 1:37 PM CDT	Mesoscale Discussion	SPC	Briscoe, Childress, Collingsworth, Cottle, Crosby, Dickens and 11 more	53 min
May 20, 5:08 PM CDT	Mesoscale Discussion	SPC	Crane, Crockett, Glasscock, Midland, Reagan, Terrell and 1 more	2 hr
May 20, 5:50 PM CDT	Mesoscale Discussion	SPC	Borden, Childress, Collingsworth, Cottle, Crosby, Dawson and 18 more	115 min

Nearby

Mesoscale Discussions in Texas, 2019 Mesoscale Discussions in Oklahoma, 2019 Every mesoscale discussion in 2019

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.