Storm Total NYC Rainfall

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Here is the total 24-hr rainfall to 11pm EDT. I've highlighted the rain so you can see the the pattern.

And, here is the same map with the geography made more prominent. 

There was a similar flood in July, 1903 with Brooklyn officially recording 8+ inches of rain, so this storm was highly unprecedented. And, just three months later, the flood of record occurred on the Passaic River in New Jersey. A warmer climate is not needed to produce extraordinary rainfall in the NYC region.

Dr. Ryan Maue's plot of heavy rainfall days in NYC pretty much demonstrate there is no climate signature on this event. 

And, Andy Revkin has some thoughts about "debuilding" to mitigate the damage extreme rainfall can create. 

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