Alert archive / Texas / Mesoscale Discussions in 2021
Mesoscale Discussion 1940
The Storm Prediction Center issued this mesoscale discussion at Nov 10, 2021, 11:21 PM CST for 22 counties in Texas. It was in force for 114 min.
The area
The outline as issued.
The facts
- Issued
- Nov 10, 2021, 11:21 PM CST (05:21 UTC)
- Expired
- Nov 11, 2021, 1:15 AM CST
- In force
- 114 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 548
All 22 counties
Anderson County, TX, Bowie County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Dallas County, TX, Ellis County, TX, Franklin County, TX, Gregg County, TX, Harrison County, TX, Henderson County, TX, Kaufman County, TX, Marion County, TX, Morris County, TX, Navarro County, TX, Panola County, TX, Rusk County, TX, Smith County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wood County, TX
The radar
The Dallas/Ft Worth radar (KFWS), 158 km from the middle of the area, began a volume at 05:21 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, 5.4 hours before the alert went out and 159 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.
208
ACUS11 KWNS 110522
SWOMCD
SPC MCD 110521
LAZ000-ARZ000-TXZ000-110715-
Mesoscale Discussion 1940
NWS Storm Prediction Center Norman OK
1121 PM CST Wed Nov 10 2021
Areas affected...northeast Texas
Concerning...Severe Thunderstorm Watch 548...
Valid 110521Z - 110715Z
The severe weather threat for Severe Thunderstorm Watch 548
continues.
SUMMARY...Strong wind gusts remain possible across northeast Texas,
with perhaps marginal hail, but severe weather is becoming less
likely with time. Additional watches are not anticipated.
DISCUSSION...Back-building storms persist near the Dallas area,
producing heavy rain and wind gusts mainly in the 30 kt range.
Eastern portions of the line are advancing more quickly into
northeast TX, oriented a bit more orthogonal to the midlevel flow.
The area from northeast TX into northwest LA may be a favored area
for a few strong wind gusts over the next several hours.
Overall, the severe risk appears to be dwindling, as the boundary
layer continues to stabilize. Objective analysis indicates less than
1000 J/kg MLCAPE as of 05Z, with warming midlevel temperatures out
of the southwest. Therefore, additional watches are not anticipated
tonight, though an isolated severe gust cannot be ruled out.
..Jewell.. 11/11/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...SHV...FWD...
LAT...LON 32899701 32739642 32729591 32899542 33169529 33499446
33319411 33029392 32579393 32039415 31689476 31719553
31919632 32219684 32459711 32709724 32899701SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 10, 7:48 PM CST | Mesoscale Discussion | SPC | Collin, Cooke, Dallas, Delta, Denton, Fannin and 9 more | 3 hr |
Nearby
Mesoscale Discussions in Texas, 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.