Severe Thunderstorm Watch 177

Issued

May 16, 2021, 2:43 PM MDT (20:43 UTC)

Expired

May 16, 2021, 10:00 PM MDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The Amarillo radar (KAMA), 171 km from the middle of the area, began a volume at 20:44 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

30%

Six or more combined severe hail and wind reports

80%

• Mesoscale Discussion 636 Severe potential...watch possibleMay 16, 1:23 PM MDT
• Mesoscale Discussion 638 Severe potential...watch likelyMay 16, 2:16 PM MDT
• Mesoscale Discussion 640 Severe potential...watch unlikelyMay 16, 4:11 PM MDT
• Mesoscale Discussion 643 Severe thunderstorm watch 177May 16, 5:12 PM MDT
• Mesoscale Discussion 645 Severe thunderstorm watch 177...179May 16, 7:54 PM MDT

284 
WWUS20 KWNS 162041
SEL7  
SPC WW 162041
COZ000-KSZ000-NMZ000-OKZ000-TXZ000-170400-

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 177
NWS Storm Prediction Center Norman OK
340 PM CDT Sun May 16 2021

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  Southeast Colorado
  Southwest Kansas
  Northeast New Mexico
  Oklahoma Panhandle
  Northwest Texas

* Effective this Sunday afternoon and evening from 340 PM until
  1100 PM CDT.

* Primary threats include...
  Scattered large hail and isolated very large hail events to 2
    inches in diameter possible
  Scattered damaging wind gusts to 70 mph possible
  A tornado or two possible

SUMMARY...Although deep-layer winds are not overly strong, a
semi-moist and moderately unstable environment will support
initially isolated severe thunderstorm development across southeast
Colorado, northeast New Mexico into the Texas Panhandle. Isolated
large hail is the primary risk initially. Over time, one or more
clusters of storms should evolve by early/mid evening and move
east-southeastward with increasing damaging wind potential across
the Texas Panhandle toward the Low Rolling Plains.

The severe thunderstorm watch area is approximately along and 105
statute miles north and south of a line from 70 miles west northwest
of Clayton NM to 65 miles east southeast of Borger TX. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU7).

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.

&&

AVIATION...A few severe thunderstorms with hail surface and aloft to
2 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
31020.

...Guyer

Severe Thunderstorm Watches in Texas, 2021Severe Thunderstorm Watches in Colorado, 2021Severe Thunderstorm Watches in New Mexico, 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.