Alert archive / Texas / Tornado Watches in 2021

Tornado Watch 49

March 24, 202143 counties in Texas

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.

IssuedProductOfficeCountiesLasted
Mar 24, 10:23 PM CDTSevere Thunderstorm WarningFWDCollin, Denton, Grayson52 min
Mar 24, 10:29 PM CDTSevere Thunderstorm WarningEWXEdwards, Val Verde61 min
Mar 24, 10:46 PM CDTSevere Thunderstorm WarningFWDEllis, Kaufman59 min
Mar 24, 11:06 PM CDTSevere Thunderstorm WarningEWXEdwards, Real, Val Verde54 min
Mar 24, 11:09 PM CDTSevere Thunderstorm WarningFWDHamilton, Lampasas, Mills39 min
Mar 24, 11:27 PM CDTSevere Thunderstorm WarningEWXGillespie, Llano63 min
Mar 24, 11:44 PM CDTSevere Thunderstorm WarningFWDKaufman, Van Zandt61 min
Mar 24, 11:51 PM CDTSevere Thunderstorm WarningEWXEdwards, Kinney, Val Verde54 min
Mar 24, 11:52 PM CDTSevere Thunderstorm WarningFWDBosque53 min
Mar 24, 11:59 PM CDTSevere Thunderstorm WarningEWXEdwards, Kerr, Real46 min
Mar 25, 12:44 AM CDTSevere Thunderstorm WarningEWXBandera, Edwards, Kinney, Real, Uvalde61 min
Mar 25, 1:44 AM CDTSevere Thunderstorm WarningEWXBandera, Kendall, Kerr, Medina, Real, Uvalde61 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.

Skew-T log-pSkew-T log-p diagram, Shreveport, LA at 00:00Z on 2021-03-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 281 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Shreveport, LA at 00:00Z on 2021-03-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 54 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
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

Open this sounding in Storm Lab

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.

...Grams

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 24, 7:37 PM CDTMesoscale DiscussionSPCBowie, Camp, Cass, Collin, Cooke, Dallas and 23 more53 min
Mar 24, 8:15 PM CDTMesoscale DiscussionSPCBandera, Bell, Blanco, Bosque, Brown, Burnet and 29 more2 hr
Mar 24, 10:28 PM CDTMesoscale DiscussionSPCEdwards, Kimble62 min
Mar 24, 11:37 PM CDTMesoscale DiscussionSPCBowie, Cass, Lamar, Morris, Red River, Titus53 min
Mar 24, 11:42 PM CDTMesoscale DiscussionSPCBurnet, Coryell, Lampasas, Llano, Mason, San Saba93 min
Mar 25, 1:40 AM CDTMesoscale DiscussionSPCAnderson, Bandera, Bell, Bexar, Blanco, Bosque and 40 more95 min

Nearby

Tornado Watches in Texas, 2021Every tornado 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.