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00:00Now to the United States where two people have died in New Jersey during flash floods

00:05as severe storms lashed to New York City and other parts of the North East. Travel has been

00:11disrupted across several states with officials urging people to remain cautious as clean-up

00:17efforts begin. In New Jersey, floods submerged cars and a cemetery. Two people died as their

00:25vehicle was swept away. The state's governor said climate change was to blame for the increasing

00:33frequency of extreme weather, with some areas seeing flooding for the first time. New Jersey

00:38residents confirmed the unusual nature of the storms. We also had deaths on July 3rd so this

00:45is like an unusual happening for this area to have, you know, fatalities as a result of a storm.

00:56In New York City, passengers in a Manhattan subway car were stranded as the station became submerged.

01:05Service was back up and running by early Tuesday,

01:08with New Yorkers typically unruffled by the previous night's events.

01:14It looks to me like if it was flooded yesterday and it's completely clear today and nobody was hurt,

01:22New York's doing fine.

01:23I mean it's not the first time that it floods. I've been working here for 11 years so whenever

01:28there's like massive rain we know that this station is not going to be working.

01:33Despite the business-as-usual attitude in the Big Apple, there is growing fear of a new climate

01:38reality in the U.S. with these storms following hot on the heels of the deadly 4th of July flooding in Texas.

01:45Right, we've got Matthew Capucci. He's a meteorologist and atmospheric scientist.

01:51It's great to have you here to pick through this a little bit. First of all,

01:55what do you know about the situation right now? Is the heavy rain continuing to fall?

02:02Well, the good news, the rain has mainly shifted off to the south and east. It's over the Virginia

02:06tidewater right now. But yesterday, up and down Interstate 95 in the eastern U.S.,

02:10it was just an absolute deluge. Slow-moving downpours moving through at rush hour.

02:15Lots of folks caught on the road as the heaviest rains fell. It was a really high-end situation and

02:20in advance of this, there were flood watches in effect. Now, I just took a look at the numbers.

02:25One location in Union County, New Jersey, saw 16.7 centimeters in only about three, four hours time.

02:31And the craziest part, 9.88 centimeters fell between 5 and 6 p.m., which is a roughly once

02:38every 100 to 200 year event. Now, of course, the atmosphere is getting more moist due to

02:43human-induced climate change, making downpours like this all the more likely to occur. But

02:48nonetheless, a very high-end meteorological setup leading to serious flash flooding in spots.

02:54Perhaps you can tell us a little bit more about what the reasons for this exceptionally heavy storm

03:00are. Where's it all come from?

03:04Great question. So, northern New Jersey and west of New York City was the intersection of two

03:08different weather boundaries. A slow-moving cold front sagging down from the south, which was kicking

03:12up warmth and moisture, but also something called a lee trough, or a broad, weak, diffuse strip of low

03:18pressure east of the Appalachians Mountains. And that weak, low pressure fostered convergence,

03:22or the gathering of air enough that we kicked air upwards and generated storms. It was a super

03:29moist air mass. But what happened was that you had a line of storms form, and then several

03:33renegade cells ahead of it. So first, these areas saw individual storm cells that were back-building,

03:39or kind of regenerating, pulling in more moisture from the south, and continually feeding themselves,

03:44nourishing themselves, and growing. And then you had a line of storms come in, and it all kind of

03:48merged over Union County, New Jersey, leading to the very high rainfall rates on the order of 8 to 10

03:54centimeters per hour at times in those heaviest downpours. The National Weather Service,

03:58of course, issuing a high-end flash flood warning, saying it was, quote, a considerable episode,

04:03meaning it was one of those higher-end events that actually triggered wireless emergency alerts.

04:07Everybody's phones buzzed with those emergency alerts. It finally wound down yesterday evening,

04:12but there's a chance of more storms later this week, and of course, more flooding too.

04:17Now, these storms have been deadly. The U.S. government's pretty much turned its back on

04:22all of its international climate change agreements, and wound back policies aimed to curb global

04:28warming. How do events like this play into the political discourse around climate change,

04:33and the way in which we deal with them when events like this happen?

04:37That's a really good question. I think it's important to remember that nothing really occurs

04:42in a vacuum, even in the world of weather. Now, weather, of course, has a lot of random events.

04:46Sometimes you get a really heavy downpour, sometimes you don't. And in the summertime,

04:50you get more of these thunderstorms, and thunderstorms will always produce heavy rains.

04:54But what's important to know is that the background state of the atmosphere is becoming more moist,

04:59and as you add more moisture to the atmosphere, not only do you have more juice to work with in storms,

05:04but you have greater precipitation efficiency, meaning if all of the levels of the atmosphere

05:09are moist, more of that raindrop makes it down without evaporating, leading to higher rainfall

05:13rates. It's like this self-reinforcing cycle. You probably saw me scribbling down some notes

05:18moments ago. I was taking a look at some data. Since 1998, we've seen a remarkable increase in

05:24atmospheric moisture during the month of July in Union County, New Jersey. We're seeing about a 9.5%

05:30increase in moisture every 10 years during July, which goes to show you we're really souping up

05:35the atmosphere, and these high-end rainfall events are made more common. In fact, across the

05:39northeastern U.S., we're seeing like a 70% to 75% uptick in heavy rain and flash flood events

05:46during the summertime months, and that's something we do expect to see more of with climate change.

05:49So ultimately, you know, political leaders will either use weather events to or for, you know,

05:55whatever causes they want to. But it's important to remember that weather does happen, weather is

06:01random at times, but the background state of the climate is favoring more precipitation extremes.

06:06Matthew Capucci, it's really great to get your insights there. Thank you so much for joining us on DW.

06:13A pleasure.

Flash Floods Hit New York & New Jersey | Deadly Climate Crisis in USA 2025 | Latest Flooding News

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