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I guesstimated something up to 400Kt and presumed US gargantuan military spending would prevent going completely Neuroshima. This assumes a weapon weak enough to not lift particulates near or above tropopause (around 9-10km, EDIT actually closer to 11-12 km for New York). So I guess with sub 1Mt yield, high humidity, and near-constant direction of coastal winds, it's correct. Still, we can throw scenarios around, but I'd probably stay put. AFAIK, NY is horrid to traverse even without incipient cataclysm, so getting far enough for it to matter doesn't seem likely.I recall reading that you want to go upwind quick because it takes 30min or so for the radioactive dust to start falling heavily.