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The threat for tornadoes and severe thunderstorms is shifting to a flooding threat due to torrential rain up the Eastern Seaboard, even as rain switches to snow in many higher-elevation areas.

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00:00What we're going to do is bring in AccuWeather Chief Meteorologist John Porter.
00:03A lot of people may be wondering, okay, I'm in between rounds of rain right now,
00:07or I haven't really seen the severe weather yet.
00:09Am I going to?
00:10Let's talk about the rest of the evening.
00:12Well, we're going to see an evolution in the threats here,
00:15and there certainly can still be some damaging wind,
00:17especially associated with the thunderstorms.
00:19But this is going to shift toward more of a flooding rainfall threat
00:23as we get repeated rounds of heavy rain along the Interstate 95 corridor,
00:28and especially some of that progressing up and toward parts of eastern Long Island
00:33into southern New England.
00:33And look on our future radar here.
00:35This is at 10 o'clock eastern time.
00:38Notice these reds and oranges.
00:39This is some fairly intense rain along multiple lines here
00:44progressing through the I-95 corridor.
00:46So while we're not expecting a widespread flooding threat
00:49because these storms are going to be moving pretty fast,
00:52any of these storms can produce rain rates of up to an inch per hour,
00:56and that can result in some localized flooding concerns here,
01:00especially across parts of southern New England.
01:03And then, Anna, look at this on the backside of the storm.
01:06Colder air arriving, and yes, rain changing to snow
01:10across parts of the Appalachians into upstate New York
01:13where there can be a couple of inches and slow travel in some places.
01:16So, yes, we've got spring-like concerns,
01:18and then a reminder that we could still be dealing with winter concerns
01:23at this time of the year as well.
01:24Yeah, you know what, mid-March, just when you think it's spring,
01:28not quite yet.
01:30Now, that flooding threat, some people might be wondering,
01:33okay, why?
01:34Well, to answer that question, we always look at
01:36what's the source of the moisture.
01:37We do.
01:38The source of the moisture is really important,
01:40and we've plotted the available moisture in the atmosphere
01:43from the ground to up to about 20,000 or 30,000 feet
01:47to get a sense of where the deepest moisture is.
01:49And those deeper moisture areas are in the oranges and reds here.
01:53And look at what we've got, a big dip in the jet stream,
01:56and that's helping to funnel high levels of atmospheric moisture
02:00right up the eastern seaboard.
02:02And look at where it's coming from.
02:03It's all the way down in the Caribbean,
02:05a direct feed of tropical moisture, an atmospheric river,
02:09and look at where it's pointed, southern New England.
02:12And that's one of the reasons that we're concerned
02:14about the risk for two to four inches of rain there
02:16with an AccuWeather local storm max of six.
02:19That's the maximum conceivable value.
02:21So there are going to be some flooding concerns here
02:24overnight tonight with a lot of wind.
02:26This is, I'm originally from New England.
02:28I'm a proud New Englander, and we like to call this type
02:29of a situation where you really want to batten down the hatches
02:32because we're going to be dealing with the wind
02:34and the heavy rain concerns as well.
02:37Yeah, so the overall message, especially with the flooding,
02:40not just tonight, but even tomorrow morning,
02:42look out for those flooded roadways.
02:44Don't try to walk or drive through them.
02:45It is just too dangerous.
02:47Now, John, you mentioned the wind.
02:49This is not just a as-the-front-passes-strong-wind-gust situation.
02:53No, it isn't.
02:54We're going to be, we've got a lot of wind here
02:56in the last couple of weeks in the east,
02:58and this is going to be another round of it.
02:59And look at widespread 40 to 50-mile-per-hour wind gusts
03:03from west of Chicago all the way to the eastern seaboard,
03:07and there will be areas of 50 to 60-mile-per-hour wind gusts
03:11here on down east Maine, southern New England,
03:13eastern Long Island, just east of New York City,
03:16down to south Jersey, and the Delaware beaches as well.
03:19And we're concerned that as some of those heavier areas of rain
03:23traverse into southern New England,
03:25that can sometimes mix down some gusty winds aloft.
03:28So watch for an AccuWeather local storm max
03:31somewhere in the east, potentially at 80 miles per hour.
03:35That would be very localized,
03:36but that can result in some tree damage,
03:39certainly in power outages as well.
03:40So a stormy night along the eastern seaboard.
03:44And John, while flooding, wind are starting to take over
03:47as the primary threat concerns,
03:49we don't want to underplay that there is a risk of isolated tornadoes
03:53and people need to be weather aware.
03:54That's correct.
03:55And I always remind people,
03:56there are many ways you can get to stay weather aware,
03:59and this is one of those days that it's really important to do so.
04:02You could download the free AccuWeather app,
04:04turn on push notifications,
04:05so we can deliver you severe weather warnings for your community
04:09and any other location you care about.
04:11For example, where your parents live,
04:13where your kids are located,
04:14you could set that up in the free AccuWeather app.
04:16We also offer AccuWeather Premium Plus,
04:18which provides an extra layer of warnings
04:21provided by AccuWeather expert meteorologists.
04:24When we can complement and extend the value of the government warnings,
04:27we do that.
04:28So that's a great resource,
04:29the AccuWeather app,
04:30and of course the AccuWeather network.
04:32This can save your life.
04:34We've heard this from many people over the years
04:36that have gotten a severe weather warning for their community,
04:39not known about it except for the AccuWeather app,
04:42got it and brought their family to safe shelter.
04:45So you can help save your life or members of your family.
04:48It's a great resource to be aware of severe weather threats.
04:52That's all in the business of keeping you best informed and safer.
04:55That's what we do here at AccuWeather.
04:57And John, before I let you go,
04:59I want us to take a look at the latest severe risk map for today
05:02put together by you and our AccuWeather forecasting team.
05:06What's the biggest piece of information
05:08you want people to take away from this?
05:09Well, I think that the biggest piece of information
05:12is we could still have some widely separated tornado concerns,
05:17especially across far eastern North Carolina.
05:20Otherwise, the tornado threat is reducing in other areas,
05:24and we still will have a damaging wind threat here
05:26from some thunderstorms that can be developed
05:29over the coming hours in the mid-Atlantic.
05:31There's been a difficult time
05:33in getting some of those thunderstorms up into Pennsylvania.
05:35There's just not enough storm fuel or instability.
05:38That's good news in general,
05:40but watch out.
05:41There still can be some isolated areas
05:43where there can be damaging winds
05:45through these areas here
05:47and enough to result in some tree damage
05:49and power line concerns as well.
05:50So stay aware with the AccuWeather app here
05:54as we head through the coming hours.
05:56All right, AccuWeather Chief Meteorologist John Porter,
05:58as always, thanks for joining us with your expertise.
06:01Good to be with you. Thank you.
06:03All right, before we go to break,
06:04I want to take a quick look at the snow side of all of this
06:08because that has been a big impact, too.
06:10Maybe you're not seeing the severe weather,
06:11but you've seen more than 25 inches of snow.
06:14Yeah, that's significant,
06:15even if you are in Wisconsin, Michigan.
06:17I mean, it's mid-March after all.
06:19And the blizzard threat, not quite over yet.
06:22We're going to keep covering this throughout the evening.
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