The “storm” hasn’t even formed yet.
The hurricane is getting ready to come ashore. There it will run directly into an Arctic cold front coming down from Canada.
The warm, moist air coming in off the water will pump right into that frozen air, causing the water to condense and fall as rain, or further inland as snow.
To top it off, there is a high pressure system far to the northeast that will keep the storm in place, drawing more water into the air—only to dump it when it moves into the cold front.
The wind will be a big deal as it comes onshore, but it will be the heavy rain for two or three days (in some places it is expected to drop 10 inches.)
Flooding will be an issue.
In addition, this being the full moon, the storm surge will be exaggerated.
Lower Manhattan is going to be under water. Not that its a big deal, but it will clean out the subways and the sewers. Think rats. Not the two legged kind, either.