The Main problem here is probably not with Halifax but with Newark. Newark Airport operates 2 primary parallel runways plus 1 shorter cross runway. A strong wind crossing those runways could impede aircraft operations while other NY airports are able to conduct operations. It is an inherent flaw in the airport's layout which has no easy fix and is the main reason why Newark is normally the most chronically delayed airport in the US.
My advice to you would be to avoid Newark at all costs and fly into or out of one of the other airports that PHX listed.
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