mamaroneck has two rivers that float through, the sheldrick and mamaroneck river. and there's a confluence at columbus park where they both meet and that is usually the area where the trouble starts. and once it overtops the banks of the river there it's a very low-lying area. and that area floods really quickly. and of course unfortunately that is the area where the people are less economically able to recover. less resilience. that seems to be the way it always happens in this world, isn't it? the people who have the most -- the least lose the most. and we're working really hard to help them recover and i noticed the community's going to pitch in. i would say what was different yesterday is just the incredible intensity of the rain and the saturation of the ground. >> too much too soon. so we'll do this, mr. mayor. as you get a sense of what's needed in that community, feel free. you have an open line to me. let me know what it is. i'll put it out on social media. if the need is great enough that it warrants coverage, we'll do it again on the show. but let me kno

in mamaroneck new york, boats carried them to safety >> we lost everything. >> reporter: similar scenes in pennsylvania and new jersey >> look at that tornado! >> reporter: where tornadoes also touched down this neighborhood outside of philadelphia ripped apart. ida was no longer a hurricane when it hit the northeast, but it was no less a punishing storm, dropping so much rain so quickly, new york city was overwhelmed more than 3 inches in central park in just one hour, smashing the previous record. waterfalls gushed into subway tunnels in queens, passengers had to jump on their seats. the bus driving through a river that used to be a street. emergency crews worked tirelessly to rescue people, but they couldn't get to everyone >> they got stuck in the back and they couldn't come out. >> reporter: a mother and son drowned in their basement apartment. new york city's mayor frustrated, said the city was caught off guard. >> i think we now understand that every attempt at projection, bluntly, is failing us from now on what i think we do is tell new yorkers to expect the very, very worst. >>

and here in mamaroneck, new york, these people lost everything. >> how high was the water? >> i would say at least 6 feet. where that line is? that's where the water went up to. >> oh, my god. >> reporter: it all started wednesday night. the national weather service issuing a flash flood emergency in new york city for the first time ever. >> the report was 3 to 6 inches over the course of the whole day, which was not a particularly problematic amount. that turned into the single biggest hour of rainfall in history with almost no warning. >> reporter: but its intensity took many by surprise. the city's infrastructure was unprepared. dozens were stuck on buses and in subway stations. >> oh, my god. i've been down here from 11:30 something. >> reporter: the mta reporting 46 stations were inundated with water. officials admitting the system was not designed for this type of record rainfall. >> anything other 2 inches an hour, we're going to have trouble with. >> reporter: and, kate, the folks in this neighborhood tell me they've seen these streets flood before, but nothing like

in mamaroneck, new york, boats carried them to safety. in new jersey, tornados also touched done.ighborhood outside of philadelphia ripped apart. ida was no longer a hurricane when it hit the northeast, but it was no less a punishing storm, dropping so much rain so quickly, new york city was overwhelmed. more than 3 inches in central park in just one hour, smashing the previous record. waterfalls gushed into subway tunnels. in queens, passengers had to jump on their seats. the bus driving through a river that used to be a street. emergency crews worked tirelessly to rescue people, but they couldn't get to everyone. >> they got stuck in the back and they couldn't come out. >> reporter: a mother and son drowned in their basement apartment. new york city's mayor frustrated saying the city was caught off guard. >> i think we understand now that every attempt at projection, bluntly, is failing us. from now on what i think we do is tell new yorkers to expect the very, very worst. >> reporter: here in new jersey, flood waters filled a home that later exploded because of a gas leak, that

so many towns across this area look like mamaroneck where the streets are lined with indoor damage and you've got walls, you've got furniture, shelving, sheetrock, appliances, you name it. there's tons of it just on this street alone but our drone halfway up shows the expanse of this. apartments and multifamily houses just gutted, residents, their lives turned upside down and here we go again with more rain. so video of franklin, central parts of pennsylvania overnight where they had not only heavy rain but they had heavy winds that brought down trees and power lines, so the headaches continue there. that rain got into new jersey, in through northern new jersey where one to two inches of rain has already fallen. lightning illuminating the skies there. the radar showing the leading edge of the next batch of heavy rain heading into the new york metropolitan area, and it's moving really slowly, held up in part by larry out there in the ocean so going to be with us all day long. it won't be quite as bad as it was last week, but the ground is completely saturated and obviously it's going to