Storms have evolved into a couple of extensive,
southeastward-moving linear segments over the past couple of hours. These storms have a history of occasional damaging wind gusts and isolated large hail. A few supercellular structures have been noted recently especially in southern New Jersey as updrafts interact with a nearly stationary surface boundary across that region. An isolated tornado cannot be completely ruled out here (in addition to a few instances of large hail), although the primary threat should be damaging wind gusts into the evening as storms migrate into a moderately unstable pre-convective airmass.
North of the linear structures, recent convective overturning has stabilized localized areas (especially in southeastern Pennsylvania) and temporarily reduced the severe threat. However, weak warm advection, pockets of insolation, and an approaching shortwave trough northwest of the region may support a renewed, yet isolated severe threat over the next few hours (especially into south-central Pennsylvania).