Time to fire up a thread banger
Sunday into Sunday night ...
Low pres tracking SE of the 40N/70W benchmark early Sun may bring a
few showers to the outer Cape and Nantucket Sun morning, otherwise
skies should become partly sunny. Mid level trough approaches from
the Great Lakes with attending cold front moving across New York
state in the afternoon. 500 mb temps -14 to -15C combined with
surface heating will allow modest instability to develop in the
afternoon with SBCAPEs 1000-1500 J/kg, focused in the interior. Best
deep layer shear is lagging instability but there is a window during
the mid/late afternoon where 1000+ J/kg CAPE coincides with 0-6km
shear around 30 kt. Expect scattered showers and t-storms to develop
and a few strong to severe storms are possible, mainly interior.
Steep low level lapse rates support strong winds with any t-storms
but hail also a threat given cold 500 mb temps. Highs should reach
well into 70s, except upper 60s east coastal MA and Cape/Islands
where sea breezes will keep it cooler.