Our attention will now turn to a a convectively enhanced shortwave
over Ontario. This feature will move ESE and across Lake Ontario
overnight, with an associated W-E oriented surface boundary moving
south across the lake before it stalls somewhere over WNY. There`s
still a variety of scenarios for convection this evening/overnight,
from nothing across all of WNY, to at least scattered convection
south of Lake Ontario and more widespread convection east of the
lake. For this reason, SPC has added locations just south and east
of Lake Ontario in a Marginal Risk for SVR weather. Will need to
keep a close eye on this as we progress through the evening and
night. Have nudge POPs up to reflect this scenario with higher
confidence for measurable precipitation east of Lake Ontario with
less confidence over the Niagara Frontier, Genesee Valley, and
Western Finger lakes. The area with the least likely chance for
any rainfall tonight is toward the Southern Tier being most
displaced from the shortwave trough and stalling surface boundary