Yeah, it does seem like at least anecdotally I've gotten more damage from random Spring / Summer storms than these situations. Obviously not a reason to pay no mind to conditions later this afternoon though as the ingredients are there. Reading some discussions seems like the big jump in threat is due to expected recovery from this mornings storms. If that fails to materialize then that should put a cap on this, but also the chance it could expand further NE. NWS made mention of a special RAOB balloon as well this afternoon. I won't be mad if this busts though, not interested having any extra outdoor cleanup lol.
A major shift has been made to the convective outlook for
Tuesday afternoon/evening in collaboration with neighboring WFOs
and the Storm Prediction Center. A rare Moderate Risk has been
added to eastern OH and Enhanced Risk was added for western PA
(including much of Allegheny County PA) for the threat for
tornadoes, large hail, and damaging wind gusts. What has
prompted this adjustment is the potential for recovery in the
wake of early-morning showers/storms in eastern OH. As a warm
front lifts north towards Erie, a surge of low-lvl moisture will
increase CAPE within a highly sheared environment. This
combination will favor supercells within the warm sector as a
strong low advances into the Ohio River Valley from the west.
After 2pm, the joint probability of 40kt of 0-6km shear and
1000 J/kg of surface-based CAPE increases to 80-90% (especially
for eastern OH). The probability significantly drops off
northeast of Pittsburgh, where models suggest cloud coverage
will remain and buoyancy will be limited.
The probability of severe storms could increase farther east
and north from the current most-likely outlook area if
sufficient heating and moisture advance into west-central PA
beyond where currently expected. A special RAOB will likely be
launched Tuesday afternoon at PIT to get a sense of atmospheric
changes in the wake of morning showers.
Overall summary: confidence is high that strong wind shear will
be available to organize storms. Destabilization in the wake of
the morning showers/storms will be the potential limiting
factor in storm severity Tuesday afternoon.