Alert archive / Texas / Tornado Watches in 2021

Tornado Watch 47

March 24, 202127 counties in Texas

The Storm Prediction Center issued this tornado watch at Mar 24, 2021, 4:38 PM CDT for 27 counties in Texas. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Mar 24, 2021, 4:38 PM CDT (21:38 UTC)
Expired
Mar 24, 2021, 10:00 PM CDT
In force
5 hr
Issued by
the Storm Prediction Center
Largest hail expected
3 in
Strongest gust expected
60 kt
All 27 counties

Bell County, TX, Bosque County, TX, Brown County, TX, Burnet County, TX, Comanche County, TX, Coryell County, TX, Ellis County, TX, Erath County, TX, Falls County, TX, Hamilton County, TX, Henderson County, TX, Hill County, TX, Hood County, TX, Johnson County, TX, Kaufman County, TX, Kimble County, TX, Lampasas County, TX, Llano County, TX, Mason County, TX, McCulloch County, TX, McLennan County, TX, Menard County, TX, Mills County, TX, Navarro County, TX, San Saba County, TX, Somervell County, TX, Van Zandt County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 95 km from the middle of the area, began a volume at 21:39 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
10%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
20%
Ten or more severe hail reports
60%
One or more hailstones of 2 inches or more
60%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

16 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Mar 24, 4:41 PM CDTSevere Thunderstorm WarningFWDMills64 min
Mar 24, 4:41 PM CDTTornado WarningSJTSan Saba34 min
Mar 24, 5:30 PM CDTSevere Thunderstorm WarningFWDHenderson, Kaufman, Van Zandt60 min
Mar 24, 5:39 PM CDTSevere Thunderstorm WarningFWDDallas, Hunt, Kaufman, Rockwall66 min
Mar 24, 5:43 PM CDTSevere Thunderstorm WarningFWDCoryell, Hamilton, Mills62 min
Mar 24, 5:45 PM CDTTornado WarningFWDCoryell, Hamilton, Lampasas, Mills45 min
Mar 24, 6:26 PM CDTSevere Thunderstorm WarningFWDBosque, Hamilton64 min
Mar 24, 6:29 PM CDTTornado WarningFWDVan Zandt31 min
Mar 24, 7:08 PM CDTTornado Warning Tornado observedFWDBosque, Hamilton52 min
Mar 24, 7:09 PM CDTSevere Thunderstorm WarningSJTBrown51 min
Mar 24, 7:33 PM CDTSevere Thunderstorm WarningFWDComanche57 min
Mar 24, 7:47 PM CDTSevere Thunderstorm WarningFWDBosque, Hill58 min
Mar 24, 7:55 PM CDTTornado WarningFWDBosque, Hill50 min
Mar 24, 8:39 PM CDTSevere Thunderstorm WarningFWDEllis, Hill, Johnson66 min
Mar 24, 9:40 PM CDTSevere Thunderstorm WarningFWDEllis65 min
Mar 24, 9:51 PM CDTSevere Thunderstorm WarningSJTKimble, McCulloch, Mason, Menard54 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, 9.6 hours before the alert went out and 123 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, Fort Worth, TX at 12:00Z on 2021-03-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Fort Worth, TX at 12:00Z on 2021-03-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 182 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1705 m above ground
0-6 km bulk shear
60 kt
0-1 km storm-relative helicity
182 m²/s²
0-3 km storm-relative helicity
362 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

895 
WWUS20 KWNS 242136
SEL7  
SPC WW 242136
TXZ000-250300-

URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 47
NWS Storm Prediction Center Norman OK
440 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 afternoon and evening from 440 PM
  until 1000 PM CDT.

* Primary threats include...
  A couple tornadoes possible
  Scattered large hail and isolated very large hail events to 3
    inches in diameter likely
  Isolated damaging wind gusts to 70 mph possible

SUMMARY...Multiple discrete supercells are expected, initially
across central Texas where the relatively greatest threat should
exist for very large hail and a couple tornadoes.

The tornado watch area is approximately along and 50 statute miles
north and south of a line from 50 miles northeast of Corsicana TX to
70 miles south southwest of Brownwood TX. For a complete depiction
of the watch see the associated watch outline update (WOUS64 KWNS
WOU7).

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.

&&

AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 3 inches. Extreme turbulence and surface wind
gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean
storm motion vector 24030.

...Grams

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 24, 3:22 PM CDTMesoscale DiscussionSPCAnderson, Bell, Bosque, Brown, Burnet, Comanche and 32 more2 hr
Mar 24, 4:59 PM CDTSevere Thunderstorm WatchSPCCamp, Collin, Cooke, Dallas, Delta, Denton and 18 more5 hr
Mar 24, 6:10 PM CDTMesoscale DiscussionSPCBell, Bosque, Brown, Burnet, Comanche, Concho and 31 more65 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.