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803 

WWUS20 KWNS 201709

SEL4

SPC WW 201709

NYZ000-PAZ000-210000-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 424

NWS Storm Prediction Center Norman OK

110 PM EDT Thu Jul 20 2017



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Central New York

  Northeast Pennsylvania



* Effective this Thursday afternoon and evening from 110 PM until

  800 PM EDT.



* Primary threats include...

  Scattered damaging wind gusts to 70 mph possible

  Scattered large hail events to 1.5 inches in diameter possible

  A tornado or two possible



SUMMARY...A cluster of intense thunderstorms near Buffalo will track

across  the watch area this afternoon, posing a risk of damaging

wind gusts and hail.  An isolated tornado or two will also be

possible.



The severe thunderstorm watch area is approximately along and 50

statute miles north and south of a line from 50 miles southwest of

Rochester NY to 25 miles north northeast of Monticello NY. For a

complete depiction of the watch see the associated watch outline

update (WOUS64 KWNS WOU4).



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

1.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A

few cumulonimbi with maximum tops to 500. Mean storm motion vector

28035.



...Hart

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