NWS says some 3+ amounts are possible
SPC currently places the southwest half of PA in a MRGL risk of
severe weather this evening. However, the bigger threat may be
locally excessive rain across southeast PA. An anomalous
southerly low level jet linked to a mid level shortwave lifting
across the Eastern Grt Lks is progged to advect pwats of around
2 inches into southern PA this evening, overrunning the
advancing warm front and setting the stage for thunderstorms
with torrential downpours and the potential of locally heavy
rainfall. Large scale forcing ahead of the mid level shortwave,
combined with anomalous pwats, supports widespread POPs in the
80-100pct range this evening. However, the threat of locally
excessive rainfall appears focused over the southeast counties,
where the 00Z HREF suggests localized amounts of 3+ inches are
possible between 00Z-08Z.