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January 19th-20th: 1st Call Snow Map

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January 19th-20th: 1st Call Snow Map Empty January 19th-20th: 1st Call Snow Map

Post by Frank_Wx Thu Jan 17, 2019 6:53 pm

Our first major winter storm event of the season carries a lot of uncertainty. For starters, there is little agreement among guidance on the exact track of the low pressure system. Most of this is due to the differences at the 500mb level with respect to the southern stream energy which should be fully sampled on tonight's 00z model runs.

Take the last 3 runs of the GFS OP for example.

January 19th-20th: 1st Call Snow Map Gfs-mslpa-eus-fh60-trend

The low pressure center is gradually shifting more S&E late Saturday night / early Sunday morning. This is a critical point because it will ultimately determine the extent of the WAA and how far north it gets. Fortunately the banana High to the north, there due to a ridge break from the -EPO, will prevent this system from being a full-on cutter. Something we have been use to this winter.

One reason the GFS and other models seem to be trending a little more S&E each consecutive run is because of a more positively tilted trough. Notice the latest trend between the 12z and 18z GFS.

January 19th-20th: 1st Call Snow Map Gfs-z500-vort-us-fh54-trend

See how heights are flatter over the Metro area?

This is also evident on the NAM.

January 19th-20th: 1st Call Snow Map Namconus-z500-vort-us-fh54-trend-1

Based off the latest trends and what I expect models to do later tonight and tomorrow, here is my 1st call snow map.

January 19th-20th: 1st Call Snow Map 1st-call-saturday

I think there is a chance the 3-6" marker can move into CNJ, NYC, and LI but I am not buying into that much accumulation when I look at the temperature profiles (850mb, 925mb, and Surface). The mid-levels warm up way too quickly because of the initial track of the primary into the southwestern Mid-Atlantic. Because ice accretion carries significant impact I've decided to not map an "ice map" yet for this system. I will outline an area tomorrow of where I think icing could be a major concern. Right now, I am thinking it will be N&W of I-95, the same areas getting hit with at least 6" of snow. Between the snow and ice there could be very hazardous living conditions with scattered power outages. Please be careful.

I'm also not buying into any back-end snow just yet. I know that opportunity exists because of some phasing that occurs with the PV. There are simply too many unknowns right now. Most likely I will have a 2nd call snow map tomorrow.

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Post by billg315 Thu Jan 17, 2019 7:01 pm

Looks good Frank. Well maybe not “good” for some, but accurate.
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Post by Guest Thu Jan 17, 2019 7:14 pm

Yeah looks “GREAT”. If you’re a masochist. Literally if this verifies with how the rest of the winter has gone we will be looking at 20”+ south of me 20”+ north of me 20”+ west of me and since there is no east that’s it. Absolutely incredible kick in the you k ow what. TWC agrees its unreal

January 19th-20th: 1st Call Snow Map C20d9210

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Post by weatherwatchermom Thu Jan 17, 2019 7:23 pm

syosnow94 wrote:Yeah looks “GREAT”. If you’re a masochist. Literally if this verifies with how the rest of the winter has gone we will be looking at 20”+ south of me 20”+ north of me 20”+ west of me and since there is no east that’s it. Absolutely incredible kick in the you k ow what. TWC agrees its unreal  

January 19th-20th: 1st Call Snow Map C20d9210how depressing and to boot when everyone else is off from school on Monday we have to go because of construction delays at the beginning of year..so bummed..hope the tables turn for the next chance
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Post by billg315 Thu Jan 17, 2019 7:24 pm

Syos, sad to say, barring a real big change in models in the next 24 hours, I think 80% of the people on this board will be disappointed in the outcome.
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Post by weatherwatchermom Thu Jan 17, 2019 7:25 pm

Thank you for the write up Frank..sad but appreciate the explanation
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Post by weatherwatchermom Thu Jan 17, 2019 7:27 pm

Are we still going to freeze up overnight Sunday into Monday?
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Post by Guest Thu Jan 17, 2019 7:29 pm

weatherwatchermom wrote:Are we still going to freeze up overnight Sunday into Monday?
. Of course we will there will be no moisture or storm so it will get cold. Then by Wednesday there will be another storm but we will be in the 40s. Then we will get cold again and next weekends potential will screw us again

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Post by billg315 Thu Jan 17, 2019 7:30 pm

weatherwatchermom wrote:Are we still going to freeze up overnight Sunday into Monday?

Anything liquid still around Sunday afternoon (snow, slush, puddles) will be solid ice by Sunday night. Going down to near Zero Sunday night.
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Post by weatherwatchermom Thu Jan 17, 2019 7:31 pm

billg315 wrote:
weatherwatchermom wrote:Are we still going to freeze up overnight Sunday into Monday?

Anything liquid still around Sunday afternoon (snow, slush, puddles) will be solid ice by Sunday night. Going down to near Zero Sunday night.
thank you
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Post by Dunnzoo Thu Jan 17, 2019 7:37 pm

syosnow94 wrote:Yeah looks “GREAT”. If you’re a masochist. Literally if this verifies with how the rest of the winter has gone we will be looking at 20”+ south of me 20”+ north of me 20”+ west of me and since there is no east that’s it. Absolutely incredible kick in the you k ow what. TWC agrees its unreal  

January 19th-20th: 1st Call Snow Map C20d9210

OMG "Harper" kiss of death right there if you're a Mets fan! lol

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Snowfall winter of 2023-2024  17.5"    

Snowfall winter of 2022-2023       6.0"
Snowfall winter of 2021-2022     17.6"    1" sleet 2/25/22
Snowfall winter of 2020-2021     51.1"
Snowfall winter of 2019-2020       8.5"
Snowfall winter of 2018-2019     25.1"
Snowfall winter of 2017-2018     51.9"
Snowfall winter of 2016-2017     45.6"
Snowfall winter of 2015-2016     29.5"
Snowfall winter of 2014-2015     50.55"
Snowfall winter of 2013-2014     66.5"
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Post by jmanley32 Thu Jan 17, 2019 8:01 pm

Thanks Frank, I will take my 3-6 and will see what your thinking is on the ice threat tomorrow, from what I have seen I think I will be in this threat area which isn't good but a experience I have not had except may when I was growing up in CT.
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Post by amugs Thu Jan 17, 2019 8:06 pm

Good call Frank and thanks for sharing.
The ice is gonna keep the WSW up for my area and others  not the snow accumulations. We need 6 plus for that.

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Post by jmanley32 Thu Jan 17, 2019 8:12 pm

amugs wrote:Good call Frank and thanks for sharing.
The ice is gonna keep the WSW up for my area and others  not the snow accumulations. We need 6 plus for that.
Yeah mugs I agree, I looked up your location and we line up if you go just a little south of east on a straight line from you to the hudson and across we meet. I think the ice will be highest in the 3-6 area and the southern part of the 6+ area. Maybe I am wrong but thats my thinking.
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Post by HectorO Thu Jan 17, 2019 9:00 pm

Man, Bloomingdale is literally on the border of the 3-6 and 6-12 line.
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Post by jmanley32 Thu Jan 17, 2019 9:00 pm

I saw some videos on YouTube of what it looked like after 0.5 inch ice and it was really really bad. The nws has some spots including my area on their experimental ice map along with several models having more than 0.5 So I couldn't even imagine. Smart your not making a map right away frank its a really bad scenario if happened and you wanna be sure your as close to right as possible. Its def be talked about in the general community so its not just models showing the usual bogus ice.
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Post by aiannone Thu Jan 17, 2019 9:18 pm

Apparently NAM coming in south and east

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Post by heehaw453 Thu Jan 17, 2019 9:28 pm

NAM much further se this 0Z run. 850s cooler. So far so good.

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Post by Vinnydula Thu Jan 17, 2019 9:33 pm

Nam your pulling me back in
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Post by CPcantmeasuresnow Thu Jan 17, 2019 9:34 pm

heehaw453 wrote:NAM much further se this 0Z run. 850s cooler. So far so good.

That's the word so far, plus a better front end dump of snow for most above I78
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Post by nutleyblizzard Thu Jan 17, 2019 9:36 pm

Wow! NAM looks to be a good 100 miles SE from 18z Much colder run!
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Post by jmanley32 Thu Jan 17, 2019 9:37 pm

This ice and snow threat combo is no joke, and forcasting winds gusting to 30-40mph NOT GOOD. I have not seen all of the parameters at significant before.

https://www.weather.gov/media/okx/Briefings/WxBriefing_FB.pdf

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Post by heehaw453 Thu Jan 17, 2019 9:39 pm

Yes. This NAM run be completely frozen 78 N. Surface temperatures remain in mid 20s. Much more snow too. I’d sign up for that run right now.

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Post by jmanley32 Thu Jan 17, 2019 9:41 pm

Oh baby 12km NAM snow map! But it looks like major icing still.
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Post by skinsfan1177 Thu Jan 17, 2019 9:42 pm

[url=https://servimg.com/view/19365188/415]January 19th-20th: 1st Call Snow Map Namcon10[/url

Big difference
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