Without any arctic airmass in sight, we usually need a favorable H5 track. I don't think it's absolutely necessary for an ULL to track under/over our location, but without having sufficient cold in place, we need to be on the colder side of the upper levels or it's a dice roll...and it's even a dice roll with precip as I think that introduces the potential for dry slotting. I'm still learning...I could have some of these details wrong, but long story short, we usually need the northern stream to dig further and/or phase earlier. With that said...both waves are close enough for at least snow tv, so might as well track 'em.