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Extreme Cold, Snow & Sleet: SECS 1/24 - 1/26


TriPol
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8 minutes ago, bluewave said:

Good signal from the 6z Euro for at least a 6-8” floor around NYC and LI before any sleet potential later Sunday using conservative 10-1 ratios which could be on the low side.

IMG_5637.thumb.jpeg.3490cad806bef9b5c67ece333449f178.jpeg

 

Those amounts look pretty reasonable and I would agree with a 6-8" floor for the NYC Metro.  In my mind that would include the Rt. 78 and 80 corridor through NJ.

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18 minutes ago, MANDA said:

One of the top 10 posts in this thread.  100%.

Where the secondary develops, how it tracks and how fast it can potentially halt the mid level warming will be important to duration of event and how much snow might fall after the mix perhaps goes back to snow.  Ideally this low will develop off the VA/DE coast and move towards Nantucket and Block Island gradually deepening as it goes.  This might be asking a lot though.  We'll see.  Either way there will be a good dump of snow and sleet to ice it up.  The snow pack will not be going anywhere anytime soon.  At this point, pending future model runs I'm expecting sleet to get mixed in as far north as my area.

Just don't like it when the 700/850 are so far NW, at least initially.

Yep, seen it before too where if 750-800mb are wrecked by the initial primary lows hanging on too long it can take a while to flip back to snow. But the coastal storm evolution is the complex part of this that we have to wait and see on. It’s looking good for at least 4-6 hours or so of heavy snow before any warm mid level air arrives. 

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1 minute ago, MANDA said:

Those amounts look pretty reasonable and I would agree with a 6-8" floor for the NYC Metro.  In my mind that would include the Rt. 78 and 80 corridor through NJ.

yup, Im at MMU and I'm thinking 6-10 is a good call right now

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49 minutes ago, NEG NAO said:

why and where ? and what evidence do you have to back up that statement  other than warm model runs 3 days in advance of the storm ?

Climo.   How many storms do we get that are 100% snow.  This is a SWFE which often flips to non snow at the end

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5 minutes ago, NJwx85 said:

The top 5 analogs over the East at 96hrs according to the 00z GFS (CIPS) are:

2/18/21

12/25/02

12/15/13

2/11/86

12/17/20

 

3/4/2001 is number 6 LOL 

12/17/20 might be a pretty good one at the end. Hopefully the snow comes in better than that one did-I ended up with 8” but was hoping for 12+ but the snow shield broke up so the warm mid level air advanced faster. 

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2 hours ago, bluewave said:

It looks like that model is counting mixed precip as snow as the 540 line is north of us during Sunday afternoon like the regular Euro.

IMG_5633.thumb.png.cbf4091852c0e62f486bc31b3e8f7660.png

IMG_5634.thumb.png.176d10cc153bfe83ba9a035d54e3858c.png

 

 

540 line is too rough to use as a definitive ptype demarc especially when it is still close.  546, which is depicted to our south could still be snow.  The devil is in the details.  The 850s do look very warm at 96 and beyond.

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Just now, qg_omega said:

NAM looks like every SWFE storm from the past 5 years, thump to sleet.  Crazy how this evolution changed from a few days ago

From suppression to mixing in 24 hrs...lol  At least we are getting the storm-suppression with 10 degree cold would have sucked royally

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