A storm that passes south and east of Long Island is the classic setup for snow because it allows the cold air that's in place to stay in place.

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This is something that is not common. Especially coming off one of the driest months of the year. It's a remarkable pattern in terms of heavy rainfall without the remnants of a tropical system or hurricane. It's dramatic after a long period of dry weather being dramatically broken by long periods of prolonged rain. This is usually a quiet month.

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