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439 

WWUS20 KWNS 102149

SEL6

SPC WW 102149

COZ000-KSZ000-NMZ000-OKZ000-TXZ000-110400-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 446

NWS Storm Prediction Center Norman OK

345 PM MDT Thu Aug 10 2017



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Eastern Colorado

  Southwestern Kansas

  Northeastern New Mexico

  The Oklahoma Panhandle

  The northern Texas Panhandle



* Effective this Thursday afternoon and evening from 345 PM until

  1000 PM MDT.



* Primary threats include...

  Scattered damaging wind gusts to 70 mph likely

  Scattered large hail and isolated very large hail events to 2.5

    inches in diameter possible

  A tornado or two possible



SUMMARY...Developing storms in northeastern Colorado will likely

congeal into a larger cluster later this evening, after some initial

supercell structures and a risk for isolated very large hail.  The

expected cluster of storms will then move southeastward toward

southwestern Kansas through early tonight, with an attendant risk

for damaging winds.  Farther south into southeastern Colorado and

northeastern New Mexico, isolated supercells will be possible along

the lee slopes of the front range, and these storms will pose a

large hail threat.  Other isolated supercell development will be

possible along a residual outflow boundary across the Texas

Panhandle.



The severe thunderstorm watch area is approximately along and 100

statute miles east and west of a line from 30 miles northeast of

Limon CO to 30 miles south southwest of Dalhart TX. For a complete

depiction of the watch see the associated watch outline update

(WOUS64 KWNS WOU6).



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 443...WW 444...WW 445...



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

31030.



...Thompson

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