if this were my honeymoon .. i wud drop everything and leave tonite (SUN) .. hard to say xactly what will transpire tmorw .. your flight does leave later in the day, which is a good thing given the snow is supposed to stop in NYC by morning .. my bet, is that the AM and psbly early after flghts to/from JFK will be cancelled .. but the later ones, maybe no probs .. esp since you are actually booked on that 4PM flight ..no worries about stand by