I remember this time of year (lived on Long Island, Grandma in North Quincy) when NYC and BOS could be 20F different because of 'the coastal front'. TV people sometimes called it a 'back door front'. I remember, maybe 1978, actual supercell drifting from the NE down to Long Island along a backdoor front.
Seeing a thunderstorm with all its structure, and an anvil, not uncommon in Texas away from the immediate, but rare in the coastal NE.