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353 

WWUS20 KWNS 042136

SEL9

SPC WW 042136

ARZ000-OKZ000-050300-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 519

NWS Storm Prediction Center Norman OK

335 PM CST Mon Dec 4 2017



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Northwestern Arkansas

  Eastern Oklahoma



* Effective this Monday afternoon and evening from 335 PM until

  900 PM CST.



* Primary threats include...

  Isolated damaging wind gusts to 70 mph possible

  Isolated large hail events to 1 inch in diameter possible

  A tornado or two possible



SUMMARY...Thunderstorms will increase in coverage/intensity this

afternoon into this evening as a surface cold front overtakes a

remnant dryline.  The storm environment will favor some potential

for supercells the first few hours after initiation, and then growth

into a line along the cold front.  Damaging winds will be the main

concern, but isolated large hail and/or a brief tornado will also be

possible.



The severe thunderstorm watch area is approximately along and 55

statute miles east and west of a line from 5 miles northeast of

Monett MO to 40 miles southeast of Mcalester OK. For a complete

depiction of the watch see the associated watch outline update

(WOUS64 KWNS WOU9).



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 518...



AVIATION...A few severe thunderstorms with hail surface and aloft to

1 inch. Extreme turbulence and surface wind gusts to 60 knots. A few

cumulonimbi with maximum tops to 450. Mean storm motion vector

24035.



...Thompson

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