Alert archive / Texas / Severe Thunderstorm Watches in 2021
Severe Thunderstorm Watch 548
The Storm Prediction Center issued this severe thunderstorm watch at Nov 10, 2021, 5:56 PM CST for 21 counties in Texas. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Nov 10, 2021, 5:56 PM CST (23:56 UTC)
- Expired
- Nov 11, 2021, 1:00 AM CST
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2.5 in
- Strongest gust expected
- 60 kt
All 21 counties
Collin County, TX, Cooke County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Ellis County, TX, Fannin County, TX, Grayson County, TX, Henderson County, TX, Hopkins County, TX, Hunt County, TX, Jack County, TX, Kaufman County, TX, Lamar County, TX, Montague County, TX, Navarro 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), 98 km from the middle of the area, began a volume at 23:58 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 50%
- One or more hailstones of 2 inches or more
- 40%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
11 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 10, 6:28 PM CST | Severe Thunderstorm Warning | FWD | Cooke, Grayson | 47 min |
| Nov 10, 7:01 PM CST | Severe Thunderstorm Warning | FWD | Montague | 44 min |
| Nov 10, 7:14 PM CST | Severe Thunderstorm Warning | FWD | Collin, Cooke, Denton, Grayson | 46 min |
| Nov 10, 7:16 PM CST | Severe Thunderstorm Warning | FWD | Jack, Wise | 29 min |
| Nov 10, 7:31 PM CST | Severe Thunderstorm Warning | FWD | Cooke, Jack, Montague, Wise | 29 min |
| Nov 10, 7:52 PM CST | Severe Thunderstorm Warning | FWD | Collin, Cooke, Denton, Grayson | 68 min |
| Nov 10, 7:56 PM CST | Severe Thunderstorm Warning | FWD | Cooke, Denton, Grayson, Jack, Montague, Wise | 34 min |
| Nov 10, 8:23 PM CST | Severe Thunderstorm Warning | FWD | Denton, Jack, Wise | 37 min |
| Nov 10, 8:56 PM CST | Severe Thunderstorm Warning | FWD | Collin, Dallas, Denton, Hunt, Parker, Rockwall and 2 more | 64 min |
| Nov 10, 9:05 PM CST | Severe Thunderstorm Warning | FWD | Lamar | 40 min |
| Nov 10, 10:05 PM CST | Severe Thunderstorm Warning | FWD | Dallas | 40 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Fort Worth, TX (KFWD), launched 12:00Z, 11.9 hours before the alert went out and 72 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
- 4 J/kg
- Mixed-layer CIN
- -49 J/kg
- Mixed-layer LCL
- 620 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 48 m²/s²
- 0-3 km storm-relative helicity
- 41 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.1
The text
As transmitted.
908
WWUS20 KWNS 102353
SEL8
SPC WW 102353
TXZ000-110700-
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 548
NWS Storm Prediction Center Norman OK
555 PM CST Wed Nov 10 2021
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
North-central and northeast Texas
* Effective this Wednesday afternoon and Thursday morning from
555 PM until 100 AM CST.
* Primary threats include...
Scattered large hail and isolated very large hail events to 2.5
inches in diameter possible
Scattered damaging wind gusts to 70 mph possible
A tornado or two possible
SUMMARY...Supercells and eventually a growing band of thunderstorms
are expected to move southeastward across the watch area tonight,
with the threat including parts of the DFW Metroplex. Storms will
offer mainly severe hail and damaging gusts, with a tornado
possible.
The severe thunderstorm watch area is approximately along and 45
statute miles either side of a line from 50 miles north northwest of
Fort Worth TX to 70 miles east of Dallas TX. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU8).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
REMEMBER...A Severe Thunderstorm Watch means conditions are
favorable for severe thunderstorms in and close to the watch area.
Persons in these areas should be on the lookout for threatening
weather conditions and listen for later statements and possible
warnings. Severe thunderstorms can and occasionally do produce
tornadoes.
&&
OTHER WATCH INFORMATION...CONTINUE...WW 546...WW 547...
AVIATION...A few severe thunderstorms with hail surface and aloft to
2.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 450. Mean storm motion vector
30030.
...EdwardsSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 10, 1:26 PM CST | Mesoscale Discussion | SPC | Caddo, Canadian, Cleveland, Comanche, Creek, Garfield and 17 more | 2 hr |
| Nov 10, 3:26 PM CST | Severe Thunderstorm Watch | SPC | Adair, Atoka, Bryan, Caddo, Canadian, Carter and 48 more | 7 hr |
| Nov 10, 5:06 PM CST | Mesoscale Discussion | SPC | Bryan, Carter, Choctaw, Cotton, Jefferson, Love and 1 more | 114 min |
Nearby
Severe Thunderstorm Watches in Texas, 2021Every severe thunderstorm watch 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.