Severe Thunderstorm Watch 221

Issued

May 28, 2021, 6:20 PM CDT (23:20 UTC)

Expired

May 28, 2021, 11:49 PM CDT

In force

5 hr

Issued by

the Storm Prediction Center

Largest hail expected

3.5 in

Strongest gust expected

60 kt

The Austin/San Antonio radar (KEWX), 108 km from the middle of the area, began a volume at 23:23 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.

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

50%

Six or more combined severe hail and wind reports

80%

• Mesoscale Discussion 786 Severe potential...watch likelyMay 28, 2:33 PM CDT
• Mesoscale Discussion 788 Severe thunderstorm watch 218May 28, 3:42 PM CDT
• Mesoscale Discussion 790 Severe thunderstorm watch 218May 28, 5:54 PM CDT
• Mesoscale Discussion 794 Severe thunderstorm watch 221May 28, 7:58 PM CDT
• Mesoscale Discussion 796 Severe thunderstorm watch 221May 28, 10:15 PM CDT

530 
WWUS20 KWNS 282317
SEL1  
SPC WW 282317
TXZ000-290700-

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 221
NWS Storm Prediction Center Norman OK
620 PM CDT Fri May 28 2021

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  South Texas

* Effective this Friday night and Saturday morning from 620 PM
  until 200 AM CDT.

* Primary threats include...
  Scattered large hail and isolated very large hail events to 3.5
    inches in diameter possible
  Scattered damaging wind gusts to 70 mph possible
  A tornado or two possible

SUMMARY...Sporadic severe thunderstorms -- including a few
supercells with very large hail -- will move southward to
southeastward through the watch area the remainder of the afternoon
and evening.  Convective cold-pool surges with severe wind, as well
as a localized tornado threat, also are possible.

The severe thunderstorm watch area is approximately along and 60
statute miles either side of a line from 15 miles south of Del Rio
TX to 80 miles east of Austin TX. For a complete depiction of the
watch see the associated watch outline update (WOUS64 KWNS WOU1).

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 218...WW 219...WW 220...

AVIATION...A few severe thunderstorms with hail surface and aloft to
3.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 600. Mean storm motion vector
30025.

...Edwards

Severe Thunderstorm Watches in Texas, 2021Every severe thunderstorm watch in 2021

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.