Post-Christmas snowstorm for the I-95 corridor

AccuWeather

In today's Forecast Feed, AccuWeather Chief Video Meteorologist Bernie Rayno discusses a post-Christmas storm that will bring accumulating snow to parts of the I-95 corridor, with snow changing to sleet in Philadelphia, and likely a significant snowstorm to New York City and Long Island.

Transcript

00:00all right we have a post-christmas snowstorm coming to the i-95 corridor now may not be much

00:11of a snowstorm in philadelphia i do think you're going to get a couple of inches you're going over

00:14the sleet where i do think there's going to be a snowstorm is going to be across the southern

00:18tier of new york in the new york city and all of long island i think it's all snow in boston the

00:25question is is how much precipitation is going to get for you right now i'm thinking about when

00:29the three inches but let's go over this this is the temperatures friday morning look at this cold

00:35that's coming in fact let me show you this cold air that's coming christmas eve christmas day actually

00:42look at the cold coming south look at it pushing south this is christmas morning this red line here

00:48is the 32 degree isotherm a dome of fresh cold air that's one of the biggest ingredients and you can

00:56see where the cold air is really in from northern new york pennsylvania in the long island and southern

01:03new england that's where the cold is uh the most intense and deep so let me show you the surface

01:11map here i'm going to show you the european first this is uh friday morning look what's going on

01:16area of high pressure south of james bay these black lines are isobars lines of equal pressure

01:23look how they kink this is showing you you're getting cold air to come all the way down into

01:28virginia here so we have a fresh dome of cold air at the surface a loft we've got a piece of energy

01:35coming out of the west coast storm here it is it's coming across minnesota and it's going to dive

01:42southeast watch it dive southeast as we get into friday see it here comes the energy coming across

01:49pennsylvania and new york state the gfs very similar this european and you can see what's

01:55happening you're getting winds on the southern side of that energy coming in out of the west southwest

02:00so the warm air is coming in from the southwest you've got the cold air in place you get clouds

02:05and precipitation and you'll notice the modeling showing you this there it is look at the pinks

02:11that's ice that's that's sleet and freezing rain and then you have the snow area mostly snow where

02:17where you have the cold air at its intense area northeastern pennsylvania extreme northern new

02:24jersey southern tier of new york binghamton uh rochester well syracuse utica binghamton and

02:33in across long island also the cold air is deep in southern new england you may not have a lot of

02:38precipitation so that's why i'm thinking this is all snow for new york city the question is how much

02:44precipice is there the european looks like a three to six inch band of snow that would go from roughly

02:50rochester or syracuse uh down toward all of long island the gfs the america model is similar in in

03:00the precipitation type it just has more precipitation it suggests that places like philadelphia can get

03:08three or four inches and new york city would be six to ten i'm not ready to abandon that idea

03:14because you've got such a cold air mass to overrun i could see our precipitation rates are heavier than

03:20what the european is showing now i want to show you something yesterday i was showing you model

03:25soundings i didn't explain it properly i'm going to explain it this morning a little better we're going

03:30to look at new york city and philadelphia look at the difference first new york city so this is friday

03:35morning this you're looking at the temperature in red and the dew point temperature in green

03:40looking at from the surface which is down here through the entire depth of the atmosphere this

03:47is aloft and what you see is these lines here this is the zero degree line or the freezing line

03:53so if your temperature and dew point is to the left of this line you're all snow if it's to the right

04:00your rain that's how you read this so this is new york city now the precipitation starts friday night

04:07this is friday night right here okay if you're precipitating here your temperature in red dew point

04:13temperature close together that means your atmosphere is saturated your precipitation precipitating

04:20where's the freezing line to the right so everything's in here this is all snow in new york city

04:26that is at 1 a.m friday night let's go to 3 a.m here is the zero line and look at all of this to the

04:37left of this freezing line that's all snow then as we get into saturday morning still all snow and then

04:44by midday while you're all the temperature and dew point temperature are to the left of the zero line

04:50you're still freezing precipitation you see how the dew point temperature and the temperature in red

04:56they're becoming farther apart it looks like a y see this it looks like a y this is a problem too

05:04because this tells me this is freezing drizzle so it's going to be icy right in the saturday morning

05:10now i want to show you the difference this is new york city during the precipitation event this is philly

05:17see philly all snow but look at it's getting closer and closer to the zero line that's friday night

05:26look at by saturday morning right here okay there's late friday night you see how philadelphia

05:36unlike new york here's your zero line some of this is in the above freezing this is sleet

05:44all right and then as you go forward in philadelphia by saturday morning now look what's going on

05:52here's your zero line and most of the temperature and dew point profile is above freezing so in

05:59philadelphia i think you're getting at least one to three inches of snow it goes over to sleep then

06:03it goes over to rain new york city you're all snow just to show you what a sleet sounding looks like i

06:09want to take you to state college this is classic this is state college watch this okay this is friday

06:14night look what's going on see here's your zero line and you see temperature and dew point most of

06:22it is below freezing but this area right here is above freezing what does that mean that means it's

06:29sleet so in central pennsylvania no snow very little it's a little bit of snow that goes over to sleep

06:34new york city my call three to six inches for you i could see 10 i think binghamton elmira three to six

06:41once you get toward the lehigh valley one to three inches of snow philadelphia is like that too

06:47central new jersey one to three inches of snow that goes over to sleep nice northern new jersey

06:52you're like new york city in all of long island it's all snow three to six with the potential for 10

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