Alert archive / Texas / Mesoscale Discussions in 2021
Mesoscale Discussion 1106
The Storm Prediction Center issued this mesoscale discussion at Jun 25, 2021, 11:36 PM CDT for Ellis County, Roger Mills County, Oklahoma; 9 counties in Texas. It was in force for 84 min.
The area
The outline as issued.
The facts
- Issued
- Jun 25, 2021, 11:36 PM CDT (04:36 UTC)
- Expired
- Jun 26, 2021, 1:00 AM CDT
- In force
- 84 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 318
Counties Ellis County, OK, Roger Mills County, OK, Armstrong County, TX, Carson County, TX, Castro County, TX, Donley County, TX, Gray County, TX, Hemphill County, TX, Randall County, TX, Swisher County, TX, Wheeler County, TX
The radar
The Amarillo radar (KAMA), 55 km from the middle of the area, began a volume at 04:36 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 00:00Z, 4.6 hours before the alert went out and 54 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
- 957 J/kg
- Mixed-layer CIN
- -173 J/kg
- Mixed-layer LCL
- 1729 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 295 m²/s²
- 0-3 km storm-relative helicity
- 439 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.3
The text
As transmitted.
505 ACUS11 KWNS 260436 SWOMCD SPC MCD 260436 OKZ000-TXZ000-260600- Mesoscale Discussion 1106 NWS Storm Prediction Center Norman OK 1136 PM CDT Fri Jun 25 2021 Areas affected...Texas Panhandle into western Oklahoma Concerning...Severe Thunderstorm Watch 318... Valid 260436Z - 260600Z The severe weather threat for Severe Thunderstorm Watch 318 continues. SUMMARY...Isolated hail/wind remain possible with thunderstorms into the early-morning hours. DISCUSSION...Strong convection has struggled to spread appreciably east across ww318 before gradually weakening. This is possibly due to some remaining inhibition across central OK. Thunderstorms have repeatedly developed upstream where lapse rates are steepest across the High Plains. Recently, convection has tended to focus along/behind the cold front as it drops south across the Panhandle. These trends may continue for some time as greater reservoir of buoyancy currently extends from the TX South Plains into extreme southwestern OK. With southerly 1km AGL flow into this activity, new updrafts remain likely across the southern TX Panhandle. With time the front should sag into western OK and this elongated corridor of convection should progress across much of the western portions of ww318, but not before the watch expires. ..Darrow.. 06/26/2021 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...OUN...LUB...AMA... LAT...LON 34690285 36409941 36059894 35090029 34270230 34690285
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 25, 8:49 PM CDT | Mesoscale Discussion | SPC | Beckham, Blaine, Custer, Dewey, Greer, Harmon and 3 more | 86 min |
| Jun 25, 11:42 PM CDT | Mesoscale Discussion | SPC | Craig, Nowata, Osage, Ottawa, Washington | 63 min |
| Jun 25, 11:59 PM CDT | Severe Thunderstorm Watch | SPC | Beckham, Blaine, Caddo, Canadian, Cleveland, Custer and 11 more | 5 hr |
| Jun 26, 1:53 AM CDT | Mesoscale Discussion | SPC | Blaine, Caddo, Canadian, Comanche, Custer, Grady and 7 more | 67 min |
| Jun 26, 12:59 PM CDT | Mesoscale Discussion | SPC | Caddo, Canadian, Cleveland, Comanche, Cotton, Garvin and 12 more | 2 hr |
| Jun 26, 3:27 PM CDT | Mesoscale Discussion | SPC | Harmon | 2 hr |
| Jun 26, 3:48 PM CDT | Severe Thunderstorm Watch | SPC | Caddo, Carter, Comanche, Cotton, Garvin, Grady and 10 more | 9 hr |
| Jun 26, 6:27 PM CDT | Mesoscale Discussion | SPC | Comanche, Cotton, Grady, Jackson, Jefferson, McClain and 2 more | 93 min |
| Jun 26, 4:58 PM CDT | Severe Thunderstorm Watch | SPC | Bailey, Briscoe, Castro, Deaf Smith, Hale, Hall and 6 more | 8 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.