Alert archive / Texas / Tornado Watches in 2021
Tornado Watch 49
The Storm Prediction Center issued this tornado watch at Mar 24, 2021, 9:52 PM CDT for 43 counties in Texas. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 24, 2021, 9:52 PM CDT (02:52 UTC)
- Expired
- Mar 25, 2021, 4:00 AM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2.5 in
- Strongest gust expected
- 70 kt
All 43 counties
Bandera County, TX, Bell County, TX, Bexar County, TX, Blanco County, TX, Bosque County, TX, Burnet County, TX, Collin County, TX, Comal County, TX, Coryell County, TX, Dallas County, TX, Delta County, TX, Edwards County, TX, Ellis County, TX, Falls County, TX, Freestone County, TX, Gillespie County, TX, Hamilton County, TX, Hays County, TX, Henderson County, TX, Hill County, TX, Hopkins County, TX, Hunt County, TX, Johnson County, TX, Kaufman County, TX, Kendall County, TX, Kerr County, TX, Kinney County, TX, Lampasas County, TX, Limestone County, TX, Llano County, TX, McLennan County, TX, Medina County, TX, Mills County, TX, Navarro County, TX, Rains County, TX, Real County, TX, Rockwall County, TX, Tarrant County, TX, Travis County, TX, Uvalde County, TX, Val Verde County, TX, Van Zandt County, TX, Williamson County, TX
The radar
The Ft Hood radar (KGRK), 91 km from the middle of the area, began a volume at 02:53 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
- 30%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 40%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 40%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
12 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 24, 10:23 PM CDT | Severe Thunderstorm Warning | FWD | Collin, Denton, Grayson | 52 min |
| Mar 24, 10:29 PM CDT | Severe Thunderstorm Warning | EWX | Edwards, Val Verde | 61 min |
| Mar 24, 10:46 PM CDT | Severe Thunderstorm Warning | FWD | Ellis, Kaufman | 59 min |
| Mar 24, 11:06 PM CDT | Severe Thunderstorm Warning | EWX | Edwards, Real, Val Verde | 54 min |
| Mar 24, 11:09 PM CDT | Severe Thunderstorm Warning | FWD | Hamilton, Lampasas, Mills | 39 min |
| Mar 24, 11:27 PM CDT | Severe Thunderstorm Warning | EWX | Gillespie, Llano | 63 min |
| Mar 24, 11:44 PM CDT | Severe Thunderstorm Warning | FWD | Kaufman, Van Zandt | 61 min |
| Mar 24, 11:51 PM CDT | Severe Thunderstorm Warning | EWX | Edwards, Kinney, Val Verde | 54 min |
| Mar 24, 11:52 PM CDT | Severe Thunderstorm Warning | FWD | Bosque | 53 min |
| Mar 24, 11:59 PM CDT | Severe Thunderstorm Warning | EWX | Edwards, Kerr, Real | 46 min |
| Mar 25, 12:44 AM CDT | Severe Thunderstorm Warning | EWX | Bandera, Edwards, Kinney, Real, Uvalde | 61 min |
| Mar 25, 1:44 AM CDT | Severe Thunderstorm Warning | EWX | Bandera, Kendall, Kerr, Medina, Real, Uvalde | 61 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
Shreveport, LA (KSHV), launched 00:00Z, 2.9 hours before the alert went out and 357 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
- 281 J/kg
- Mixed-layer CIN
- -75 J/kg
- Mixed-layer LCL
- 1372 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 54 m²/s²
- 0-3 km storm-relative helicity
- 112 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.9
The text
As transmitted.
172
WWUS20 KWNS 250248
SEL9
SPC WW 250248
TXZ000-250900-
URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 49
NWS Storm Prediction Center Norman OK
950 PM CDT Wed Mar 24 2021
The NWS Storm Prediction Center has issued a
* Tornado Watch for portions of
Central to northeast Texas
* Effective this Wednesday night and Thursday morning from 950 PM
until 400 AM CDT.
* Primary threats include...
A couple tornadoes possible
Scattered damaging winds and isolated significant gusts to 80
mph possible
Scattered large hail and isolated very large hail events to 2.5
inches in diameter possible
SUMMARY...Multiple clusters of supercells are expected to persist
through the overnight. The potential for more intense clusters
should emanate east-northeast from the Edwards Plateau towards the
I-35 corridor in central Texas.
The tornado watch area is approximately along and 75 statute miles
east and west of a line from 60 miles east northeast of Dallas TX to
45 miles east southeast of Del Rio TX. For a complete depiction of
the watch see the associated watch outline update (WOUS64 KWNS
WOU9).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
REMEMBER...A Tornado Watch means conditions are favorable for
tornadoes and 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.
&&
OTHER WATCH INFORMATION...CONTINUE...WW 47...WW 48...
AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 2.5 inches. Extreme turbulence and surface wind
gusts to 70 knots. A few cumulonimbi with maximum tops to 550. Mean
storm motion vector 22030.
...GramsSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 24, 7:37 PM CDT | Mesoscale Discussion | SPC | Bowie, Camp, Cass, Collin, Cooke, Dallas and 23 more | 53 min |
| Mar 24, 8:15 PM CDT | Mesoscale Discussion | SPC | Bandera, Bell, Blanco, Bosque, Brown, Burnet and 29 more | 2 hr |
| Mar 24, 10:28 PM CDT | Mesoscale Discussion | SPC | Edwards, Kimble | 62 min |
| Mar 24, 11:37 PM CDT | Mesoscale Discussion | SPC | Bowie, Cass, Lamar, Morris, Red River, Titus | 53 min |
| Mar 24, 11:42 PM CDT | Mesoscale Discussion | SPC | Burnet, Coryell, Lampasas, Llano, Mason, San Saba | 93 min |
| Mar 25, 1:40 AM CDT | Mesoscale Discussion | SPC | Anderson, Bandera, Bell, Bexar, Blanco, Bosque and 40 more | 95 min |
Nearby
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.