Alert archive / Texas / Mesoscale Discussions in 2021
Mesoscale Discussion 1939
The Storm Prediction Center issued this mesoscale discussion at Nov 10, 2021, 7:48 PM CST for Love County, Oklahoma; 15 counties in Texas. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Nov 10, 2021, 7:48 PM CST (01:48 UTC)
- Expired
- Nov 10, 2021, 10:45 PM CST
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 548
Counties Love County, OK, Collin County, TX, Cooke County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Fannin County, TX, Grayson County, TX, Hopkins County, TX, Hunt County, TX, Kaufman County, TX, Rains County, TX, Rockwall County, TX, Tarrant County, TX, Van Zandt County, TX, Wise County, TX
The radar
The Dallas/Ft Worth radar (KFWS), 88 km from the middle of the area, began a volume at 01:48 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
Fort Worth, TX (KFWD), launched 00:00Z, 1.8 hours before the alert went out and 77 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
- 1140 J/kg
- Mixed-layer CIN
- -16 J/kg
- Mixed-layer LCL
- 1186 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 238 m²/s²
- 0-3 km storm-relative helicity
- 243 m²/s²
- Significant tornado parameter
- 1.4
- Supercell composite
- 8.1
The text
As transmitted.
786 ACUS11 KWNS 110149 SWOMCD SPC MCD 110148 TXZ000-OKZ000-110445- Mesoscale Discussion 1939 NWS Storm Prediction Center Norman OK 0748 PM CST Wed Nov 10 2021 Areas affected...north Texas Concerning...Severe Thunderstorm Watch 548... Valid 110148Z - 110445Z The severe weather threat for Severe Thunderstorm Watch 548 continues. SUMMARY...The severe hail and wind threat is expected to continue east/southeast across the watch area. DISCUSSION...A cluster of strong to severe storms, previously over the Wichita Falls area, is expected to persist east/southeastward across north TX, and possibly merge with other activity north of Denton. Despite loss of heating, cold air aloft with the upper trough will overspread the moist sector where low 60s F dewpoints remain, which will maintain favorable instability. Further, the organized nature of the western cluster suggests several more hours of wind and hail potential extending east/southeastward across north TX. In addition, 0-1 km SRH of 200-300 m2/s2 may yet support a brief tornado with cells preceding the main outflow surge. ..Jewell.. 11/11/2021 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...SHV...FWD...OUN... LAT...LON 32229584 32869792 34129745 33469539 32229584
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 10, 11:21 PM CST | Mesoscale Discussion | SPC | Anderson, Bowie, Camp, Cass, Cherokee, Dallas and 16 more | 114 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.