Alert archive / Texas / Mesoscale Discussions in 2019

Mesoscale Discussion 365

April 17, 20195 counties in Oklahoma; 22 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 17, 2019, 1:13 PM CDT for 5 counties in Oklahoma; 22 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Apr 17, 2019, 1:13 PM CDT (18:13 UTC)
Expired: Apr 17, 2019, 3:15 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 80%

All 27 counties

Beckham County, OK, Ellis County, OK, Greer County, OK, Harmon County, OK, Roger Mills County, OK, Armstrong County, TX, Briscoe County, TX, Carson County, TX, Childress County, TX, Collingsworth County, TX, Cottle County, TX, Donley County, TX, Gray County, TX, Hall County, TX, Hansford County, TX, Hartley County, TX, Hemphill County, TX, Hutchinson County, TX, Lipscomb County, TX, Moore County, TX, Ochiltree County, TX, Oldham County, TX, Potter County, TX, Randall County, TX, Roberts County, TX, Swisher County, TX, Wheeler County, TX

The radar

The Amarillo radar (KAMA), 45 km from the middle of the area, began a volume at 18:13 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.

Severe Thunderstorm Watch 75Apr 17, 1:30 PM CDT

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 12:00Z, 6.2 hours before the alert went out and 44 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2860 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 33 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 17, 1:32 PM CDT	Severe Thunderstorm Watch	SPC	Alfalfa, Beaver, Beckham, Blaine, Custer, Dewey and 11 more	6 hr
Apr 17, 3:30 PM CDT	Mesoscale Discussion	SPC	Carter, Jefferson, Love, Marshall	2 hr
Apr 17, 3:43 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Beaver, Beckham, Custer, Dewey, Ellis and 8 more	2 hr
Apr 17, 4:27 PM CDT	Severe Thunderstorm Watch	SPC	Canadian, Cleveland, Craig, Garfield, Grady, Grant and 14 more	8 hr
Apr 17, 5:50 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Beckham, Custer, Dewey, Ellis, Greer and 9 more	85 min
Apr 17, 5:54 PM CDT	Mesoscale Discussion	SPC	Jefferson, Love	2 hr
Apr 17, 6:08 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Blaine, Dewey, Garfield, Grant, Kay and 11 more	97 min
Apr 17, 6:16 PM CDT	Severe Thunderstorm Watch	SPC	Bryan, Carter, Johnston, Love, Marshall	9 hr
Apr 17, 6:59 PM CDT	Mesoscale Discussion	SPC	Bandera, Blanco, Brown, Burnet, Concho, Edwards and 17 more	61 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.