Alert archive / Texas / Mesoscale Discussions in 2021
Mesoscale Discussion 940
The Storm Prediction Center issued this mesoscale discussion at Jun 12, 2021, 9:23 PM CDT for Cimarron County, Oklahoma; 12 counties in Texas. It was in force for 67 min.
The area
The outline as issued.
The facts
- Issued
- Jun 12, 2021, 9:23 PM CDT (02:23 UTC)
- Expired
- Jun 12, 2021, 10:30 PM CDT
- In force
- 67 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe potential...watch possible
- Chance of a watch
- 60%
Counties Cimarron County, OK, Bailey County, TX, Castro County, TX, Dallam County, TX, Deaf Smith County, TX, Hartley 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), 55 km from the middle of the area, began a volume at 02:24 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, 2.4 hours before the alert went out and 56 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.
754 ACUS11 KWNS 130224 SWOMCD SPC MCD 130223 OKZ000-TXZ000-130330- Mesoscale Discussion 0940 NWS Storm Prediction Center Norman OK 0923 PM CDT Sat Jun 12 2021 Areas affected...Western portions of the Oklahoma and Texas Panhandle Region Concerning...Severe potential...Watch possible Valid 130223Z - 130330Z Probability of Watch Issuance...60 percent SUMMARY...Severe thunderstorm watch may be warranted for western portions of the Oklahoma and Texas Panhandle region. Damaging winds and large hail are the primary risks. DISCUSSION...Convection that developed off the higher terrain from southeast CO into central NM has finally developed enough mass/cold pool to begin propagating southeast away from the initiating region/steeper low-level lapse rates. 00z sounding from AMA exhibited a weak cap near 700mb, but with a 70F surface dew point MLCAPE was ~3700 J/kg. There is some concern this activity may spread east of ww262 as east-southeast boundary-layer inflow is quite moist and potentially buoyant. Severe thunderstorm watch may be warranted soon to account for this threat. ..Darrow/Dial.. 06/13/2021 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...LUB...AMA... LAT...LON 34040294 36870265 36340139 34160155 34040294
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 12, 9:39 PM CDT | Severe Thunderstorm Watch | SPC | Cimarron, Texas | 6 hr |
| Jun 12, 11:33 PM CDT | Mesoscale Discussion | SPC | Cimarron, Texas | 87 min |
| 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.