Severe Thunderstorm Watch 165

Issued

May 11, 2021, 3:41 PM CDT (20:41 UTC)

Expired

May 12, 2021, 1:22 AM CDT

In force

10 hr

Issued by

the Storm Prediction Center

Largest hail expected

2.5 in

Strongest gust expected

60 kt

The Austin/San Antonio radar (KEWX), 94 km from the middle of the area, began a volume at 20:40 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

60%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

90%

• Mesoscale Discussion 592 Severe potential...watch possibleMay 11, 1:22 PM CDT
• Mesoscale Discussion 594 Severe potential...watch possibleMay 11, 1:59 PM CDT
• Mesoscale Discussion 596 Severe thunderstorm watch 165May 11, 5:23 PM CDT
• Mesoscale Discussion 598 Severe thunderstorm watch 165May 11, 8:02 PM CDT
• Mesoscale Discussion 600 Severe thunderstorm watch 167May 11, 10:47 PM CDT

602 
WWUS20 KWNS 112037
SEL5  
SPC WW 112037
TXZ000-120300-

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 165
NWS Storm Prediction Center Norman OK
340 PM CDT Tue May 11 2021

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  Parts of south central Texas and the Edwards Plateau

* Effective this Tuesday afternoon and evening from 340 PM until
  1000 PM CDT.

* Primary threats include...
  Scattered large hail likely with 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...Thunderstorm development is expected this afternoon along
and to the cool side of a slow-moving front, while other storms in
northeast Mexico will approach the border.  The initial more
discrete storms could be supercells with an attendant threat for
isolated very large hail.  By this evening, there will be the
potential for some upscale growth through storm mergers, and some
increase in the threat for damaging winds.  Prior to the upscale
growth, a brief tornado or two cannot be ruled out with supercells
along the front.

The severe thunderstorm watch area is approximately along and 100
statute miles east and west of a line from 45 miles north northwest
of New Braunfels TX to 45 miles west southwest of Laredo TX. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU5).

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 164...

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 550. Mean storm motion vector
24035.

...Thompson

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.