Alert archive / Texas / Mesoscale Discussions in 2021
Mesoscale Discussion 941
The Storm Prediction Center issued this mesoscale discussion at Jun 12, 2021, 11:33 PM CDT for Cimarron County, Texas County, Oklahoma; 20 counties in Texas. It was in force for 87 min.
The area
The outline as issued.
The facts
- Issued
- Jun 12, 2021, 11:33 PM CDT (04:33 UTC)
- Expired
- Jun 13, 2021, 1:00 AM CDT
- In force
- 87 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 263
All 22 counties
Cimarron County, OK, Texas County, OK, Armstrong County, TX, Bailey County, TX, Briscoe County, TX, Carson County, TX, Castro County, TX, Dallam County, TX, Deaf Smith County, TX, Floyd County, TX, Hale County, TX, Hansford County, TX, Hartley County, TX, Hutchinson County, TX, Lamb County, TX, Moore County, TX, Oldham County, TX, Parmer County, TX, Potter County, TX, Randall County, TX, Sherman County, TX, Swisher County, TX
The radar
The Amarillo radar (KAMA), 45 km from the middle of the area, began a volume at 04:34 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 nearest sounding before it
Amarillo Airport, TX (KAMA), launched 00:00Z, 4.6 hours before the alert went out and 46 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
- 3697 J/kg
- Mixed-layer CIN
- -21 J/kg
- Mixed-layer LCL
- 1361 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 42 m²/s²
- 0-3 km storm-relative helicity
- 190 m²/s²
- Significant tornado parameter
- 1.9
- Supercell composite
- 18.7
The text
As transmitted.
682 ACUS11 KWNS 130434 SWOMCD SPC MCD 130433 TXZ000-KSZ000-OKZ000-COZ000-130600- Mesoscale Discussion 0941 NWS Storm Prediction Center Norman OK 1133 PM CDT Sat Jun 12 2021 Areas affected...Western OK/TX Panhandle Region Concerning...Severe Thunderstorm Watch 263... Valid 130433Z - 130600Z The severe weather threat for Severe Thunderstorm Watch 263 continues. SUMMARY...Damaging winds, along with some hail threat, remain possible across ww263. DISCUSSION...Small MCS has matured over the northwestern portion of ww263. Leading edge of this activity is surging southeast at roughly 25kt as it propagates along the northern edge of stronger instability that stretches across the TX Panhandle into northwestern TX. Given the cold pool that appears to be forming with this cluster, it would seem this complex should continue propagating southeast toward the AMA region, possibly reaching I-40 by 0630z. Farther southwest, more disorganized convection extends along the NM border but there has been some increase over Oldham County TX where large hail is likely occurring. Despite the capping that was observed at AMA this evening, sufficient organization/cold pool with these clusters should allow for further propagation, likely across the remainder of ww263 by 08z. ..Darrow.. 06/13/2021 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...DDC...LUB...AMA...PUB... LAT...LON 33700289 37070299 37070101 33700099 33700289
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 12, 9:23 PM CDT | Mesoscale Discussion | SPC | Cimarron | 67 min |
| Jun 12, 9:39 PM CDT | Severe Thunderstorm Watch | SPC | Cimarron, Texas | 6 hr |
| Jun 13, 12:53 AM CDT | Mesoscale Discussion | SPC | Harmon, Roger Mills, Texas | 97 min |
| Jun 13, 6:31 PM CDT | Mesoscale Discussion | SPC | Blaine, Caddo, Canadian, Carter, Comanche, Cotton and 9 more | 119 min |
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.