SUMMARY...A few stronger storms will continue shifting eastward
across the Delaware Valley and southeastern Pennsylvania into New
Jerse and the New York City area this afternoon. Locally
strong/gusty winds are expected. A WW may be considered.
DISCUSSION...Latest radar Loop shows a area of thunderstorms moving
slowly eastward across eastern Pennsylvania and into northwestern
New Jersey at this time. A few stronger storms have evolved --
aided by 1000 to 1500 J/kg mixed-layer CAPE as boundary-layer
heating occurs beneath cool air aloft/steep lapse rates in
conjunction with the vort max/short-wave trough crossing the central
Appalachians. While lower tropospheric flow remains rather weak,
moderate westerly mid-level flow is sufficient to support
multicell-type organization, and thus potential for gusty winds
capable of minor damage -- primarily limited to tree damage.
As storms continue shifting eastward, they will begin affecting
western fringes of the New York City metro area in the next 1 to 2
hours.