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664 

WWUS20 KWNS 212048

SEL7

SPC WW 212048

NYZ000-PAZ000-LEZ000-LOZ000-220300-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 387

NWS Storm Prediction Center Norman OK

450 PM EDT Fri Sep 21 2018



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Parts of western and northern New York

  Northwestern Pennsylvania

  Lake Erie

  Lake Ontario



* Effective this Friday afternoon and evening from 450 PM until

  1100 PM EDT.



* Primary threats include...

  Scattered damaging wind gusts to 70 mph likely

  A tornado or two possible



SUMMARY...Bands of thunderstorms are developing along and ahead of a

cold front that will progress eastward across the lower Great Lakes

region this evening.  The storm environment favors damaging gusts

with the stronger embedded storms, in what should become a more

continuous squall line by this evening.  An isolated tornado or two

will also be possible with circulations embedded in the line of

storms.



The severe thunderstorm watch area is approximately along and 65

statute miles north and south of a line from 30 miles northeast of

Massena NY to 40 miles south southwest of Jamestown NY. 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.



&&



OTHER WATCH INFORMATION...CONTINUE...WW 386...



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

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

few cumulonimbi with maximum tops to 450. Mean storm motion vector

26045.



...Thompson

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