Alert archive / Texas / Mesoscale Discussions in 2019
Mesoscale Discussion 710
The Storm Prediction Center issued this mesoscale discussion at May 20, 2019, 5:50 PM CDT for 24 counties in Texas. It was in force for 115 min.
The area
The outline as issued.
The facts
- Issued
- May 20, 2019, 5:50 PM CDT (22:50 UTC)
- Expired
- May 20, 2019, 7:45 PM CDT
- In force
- 115 min
- Issued by
- the Storm Prediction Center
All 24 counties
Borden 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, Garza County, TX, Glasscock County, TX, Hall County, TX, Howard County, TX, Kent County, TX, King County, TX, Lynn County, TX, Martin County, TX, Midland County, TX, Mitchell County, TX, Motley County, TX, Scurry County, TX, Stonewall County, TX, Wheeler County, TX
The radar
The Lubbock radar (KLBB), 85 km from the middle of the area, began a volume at 22:53 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, 10.8 hours before the alert went out and 201 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.
- 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
The text
As transmitted.
876
ACUS11 KWNS 202250
SWOMCD
SPC MCD 202250
OKZ000-TXZ000-210045-
Mesoscale Discussion 0710
NWS Storm Prediction Center Norman OK
0550 PM CDT Mon May 20 2019
Areas affected...Southeast Texas Panhandle...Eastern Texas South
Plains...Portions of Permian Basin
Concerning...Tornado Watch 197...
Valid 202250Z - 210045Z
The severe weather threat for Tornado Watch 197 continues.
SUMMARY...The tornado threat will continue within WW 197. Given the
strength of the low-level shear expected, tornadoes will be possible
with all storm modes. However, significant tornadoes will remain
possible with any storm that can remain discrete.
DISCUSSION...Several discrete/semi-discrete supercell thunderstorms
are ongoing across WW 197. So far, tornadic activity has been
limited by the number of storms ongoing in relative close proximity.
Nevertheless, very strong deep-layer shear (60-70 kts) and strong
low-level veering ahead of these storms, particularly in northwest
Texas and into southwest Oklahoma, will continue to support strong
low-level rotation. As the low-level jet continues to increase this
evening, the tornado threat should also increase. The threat for
strong tornadoes will generally be modulated by storm mode. Any
storm that can remain discrete will continue to pose a threat for a
significant tornado. However, given the very strong low-level shear,
tornadoes will remain possible within linear segments.
..Wendt.. 05/20/2019
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...OUN...SJT...LUB...AMA...MAF...
LAT...LON 34630113 35500060 35590001 34619991 33759995 33110014
32410063 31570148 31310245 31880254 34630113SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 19, 7:21 PM CDT | Mesoscale Discussion | SPC | Harrison, Panola | 84 min |
| May 19, 11:56 PM CDT | Mesoscale Discussion | SPC | Andrews, Armstrong, Bailey, Briscoe, Carson, Castro and 21 more | 2 hr |
| May 20, 1:57 AM CDT | Severe Thunderstorm Watch | SPC | Armstrong, Bailey, Carson, Castro, Cochran, Dallam and 21 more | 8 hr |
| May 20, 6:14 AM CDT | Mesoscale Discussion | SPC | Hemphill, Lipscomb, Ochiltree, Roberts | 2 hr |
| May 20, 10:41 AM CDT | Mesoscale Discussion | SPC | Armstrong, Borden, Briscoe, Carson, Castro, Childress and 34 more | 3 hr |
| May 20, 11:17 AM CDT | Mesoscale Discussion | SPC | Hardeman, Wichita, Wilbarger | 2 hr |
| May 20, 12:36 PM CDT | Tornado Watch | 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, 1:37 PM CDT | Tornado Watch | SPC | Archer, Baylor, Clay, Foard, Hardeman, Knox and 2 more | 8 hr |
| May 20, 2:15 PM CDT | Mesoscale Discussion | SPC | Dallam, Hansford, Hartley, Hutchinson, Lipscomb, Moore and 4 more | 90 min |
| May 20, 5:08 PM CDT | Mesoscale Discussion | SPC | Crane, Crockett, Glasscock, Midland, Reagan, Terrell and 1 more | 2 hr |
Nearby
Mesoscale Discussions in Texas, 2019Every 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.