Alert archive / Texas / Mesoscale Discussions in 2021
Mesoscale Discussion 814
The Storm Prediction Center issued this mesoscale discussion at May 30, 2021, 6:04 PM CDT for Cimarron County, Texas County, Oklahoma; 9 counties in Texas. It was in force for 86 min.
The area
The outline as issued.
The facts
- Issued
- May 30, 2021, 6:04 PM CDT (23:04 UTC)
- Expired
- May 30, 2021, 7:30 PM CDT
- In force
- 86 min
- Issued by
- the Storm Prediction Center
- Concerning
- Tornado watch 226
Counties Cimarron County, OK, Texas County, OK, Dallam County, TX, Hansford County, TX, Hartley County, TX, Hemphill County, TX, Hutchinson County, TX, Moore County, TX, Ochiltree County, TX, Roberts County, TX, Sherman County, TX
The radar
The Amarillo radar (KAMA), 103 km from the middle of the area, began a volume at 23:05 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, 11.1 hours before the alert went out and 104 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
- 64 J/kg
- Mixed-layer CIN
- -307 J/kg
- Mixed-layer LCL
- 1320 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 51 m²/s²
- 0-3 km storm-relative helicity
- 188 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
540
ACUS11 KWNS 302305
SWOMCD
SPC MCD 302304
TXZ000-OKZ000-NMZ000-310030-
Mesoscale Discussion 0814
NWS Storm Prediction Center Norman OK
0604 PM CDT Sun May 30 2021
Areas affected...portions of the Oklahoma and northern Texas
Panhandles
Concerning...Tornado Watch 226...
Valid 302304Z - 310030Z
The severe weather threat for Tornado Watch 226 continues.
SUMMARY...Locally higher tornado threat is expected to continue for
at least the next couple of hours along a near-stationary boundary.
Large hail will also be a concern with the more persistent updrafts.
DISCUSSION...Multiple discrete/semi-discrete supercells are in
progress across portions of the western Oklahoma Panhandle and
northwest Texas Panhandle, with 50 dBZ echoes exceeding 40 kft, and
18 dBZ echo tops exceeding 55 kft over the past hour per MRMS mosaic
radar data. MRMS mosaics have also shown 2+ inch diameter MESH, with
tornadoes reported on at least 3 separate storms within the last 1-2
hours in this area. In addition to 1000-1500 J/kg MLCAPE and 40+ kts
of effective bulk shear, these storms appear to be traversing a
near-stationary baroclinic zone, where locally higher streamwise
vorticity is available. The boundary-layer is expected to remain
mixed/unstable for at least a few more hours, with 100-200 m2/s2
effective SRH available to support the potential for a couple more
tornadoes with storms that interact favorably with the boundary.
..Squitieri/Guyer.. 05/30/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...AMA...ABQ...
LAT...LON 36850299 36920210 36610072 36260026 35760020 35480059
35380115 35530190 35760255 35990299 36540300 36850299SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 29, 7:28 PM CDT | Severe Thunderstorm Watch | SPC | Cimarron, Texas | 8 hr |
| May 29, 9:20 PM CDT | Mesoscale Discussion | SPC | Cimarron | 85 min |
| May 29, 11:59 PM CDT | Mesoscale Discussion | SPC | Cimarron | 61 min |
| May 30, 3:52 PM CDT | Mesoscale Discussion | SPC | Beaver, Cimarron, Texas | 113 min |
| May 30, 4:42 PM CDT | Tornado Watch | SPC | Cimarron, Texas | 7 hr |
| May 30, 2:00 AM CDT | Mesoscale Discussion | SPC | Castro, Deaf Smith, Oldham, Parmer, Potter, Randall | 60 min |
| May 30, 5:37 PM CDT | Mesoscale Discussion | SPC | Bailey, Briscoe, Castro, Cochran, Cottle, Crosby and 16 more | 83 min |
| May 30, 6:03 PM CDT | Severe Thunderstorm Watch | SPC | Andrews, Bailey, Borden, Briscoe, Castro, Childress and 30 more | 7 hr |
Nearby
Mesoscale Discussions in Texas, 2021Mesoscale Discussions in Oklahoma, 2021Every mesoscale discussion in 2021
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.