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NYC Jan 20/21 Obs and Discussion Thread


am19psu

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Of course they are ... this is a board for snow enthusiasts, after all. I think I used to be that way, myself... now I try to take a more objective and less emotional approach to a forecast.

Truth is, the last few winters have seen many storms (at least the big ones) overperform. But I'm sure you can remember Bust-o-rama winters when 3-6/4-8 became a slushy coating or rain or zippo.

Bottom line is that I have had constant snow cover since Boxing Day on the Southern Tip of Manhattan and that in itself is pretty remarkable. So whatever we wind up getting overnight, NYC-ers can't really complain if we get 2 vs. 6.

i agree.

when was the last time NYC had snow cover for as long at this? dec 26 thru Jan 21 (min)

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well the 02Z RUN of the RUC with the new data like the 00Z NAM and GFS just came out and it definitely puts a delay on snow in the southeastern half of CT through all of long island until about 4 or 5 am and has it ending there between 8-10 am yikes.. RUC is usually spot on with start and stop times.. as for everyone north west of that line.. it looks like an 8 hour moderate snow event.. I really think 4" is a good number area wide 3-5" up to 6" jackpot great call by upton.. which is why i still think bad collaboration between offices (even though i got some heat for some reason for saying this before) with albany going for a robust 5-10" in areas 10-15 miles north of me.. and box going 4-8 for all of north central and eastern ct" the gradient won't be that drastic.. i think the jackpot will be tolland and windham counties northeastward toward boston getting 4"+

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If anything the people that are going to be in trouble are those in E PA and W NJ, not most of the posters here, once the coastal starts the precip back in those areas may start going swiss cheese as often occurs....I have to go downstairs for 30 minutes...when I get back I'll judge the GFS run on the next storm based on how many people are in this thread vs. that one.

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Guest Patrick

Subsidence seems to be winning out so far over N/C NJ.... I realize we are going to see the dynamics improve as we go through 1/2a.m., so I don't think anyone should be jumping off of bridges yet. Still, this is a pretty neat radar shot... just thinking of the cold air rushing in behind this storm is thrilling:

http://radar.weather.gov/radar.php?product=N0R&rid=okx&loop=yes

I will say this, the RUC is performing pretty poorly even on it's 2-4 hour forecasts with the timing and intensity of precipitation in Eastern PA. It continues to back off each run..so we will have to watch upstream obs constantly over the next few hours.

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If anything the people that are going to be in trouble are those in E PA and W NJ, not most of the posters here, once the coastal starts the precip back in those areas may start going swiss cheese as often occurs....I have to go downstairs for 30 minutes...when I get back I'll judge the GFS run on the next storm based on how many people are in this thread vs. that one.

Great, what else is new this year. :arrowhead:

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If anything the people that are going to be in trouble are those in E PA and W NJ, not most of the posters here, once the coastal starts the precip back in those areas may start going swiss cheese as often occurs....I have to go downstairs for 30 minutes...when I get back I'll judge the GFS run on the next storm based on how many people are in this thread vs. that one.

Nice call on the bridge jump... you can see the initial WAA precip staying to our north ... still waiting to see blossoming echoes in this neck of the woods with the developing coastal.

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Guest Patrick

Wow John... so according to the RUC, we're looking at some pretty moderate snow falling during the middle of the morning rush - 6-8a.m. looks pretty brutal throughout the entire metro.

11z...sweet

RUC_255_2011012103_F08_CREF_SURFACE.png

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<br><br>That does look pretty tasty... coastal looks to develop just in time - of course, it is the RUC but the RUC has been pretty good of late.

<div><br></div><div><img src="http://img.amwx.us/public/style_emoticons/default/popcorn.gif" alt=":popcorn:" class="bbc_emoticon"></div>

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I will say this, the RUC is performing pretty poorly even on it's 2-4 hour forecasts with the timing and intensity of precipitation in Eastern PA. It continues to back off each run..so we will have to watch upstream obs constantly over the next few hours.

I hope you don't delete my post on the basis of being too negative, but following your lead, and looking upstream and putting aside the ominous latest computer models projections, I'm concerned about getting dry slotted based upon the direction of the radar echoes and the surface obs. The surface LPS appears to be moving ene consistent with the 500 vort max flow, and the center of it may pass directly over our area, with the bulk of the snowfall passing to our north.

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I hate, hate, hate being on the southern edge of model guidance. It is a dangerous place to be.

You are kind of in nail-biting land... like I said earlier, you never ever want to be on the S side of snows, esp. in a moderate event like this.

Way way too many things can go wrong - dry slot, warm nose, ratios, sun angle, ace delivering a ton of ice melter with instructions to spread all over your lawn... you know, the usual...

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I hope you don't delete my post on the basis of being too negative, but following your lead, and looking upstream and putting aside the ominous latest computer models projections, I'm concerned about getting dry slotted based upon the direction of the radar echoes and the surface obs. The surface LPS appears to be moving ene consistent with the 500 vort max flow, and the center of it may pass directly over our area, with the bulk of the snowfall passing to our north.

Yeah, and that was my concern as well in a post earlier.

BUT the coastal ALWAYS changes the radar signature ... which is why living here is so much more interesting than living in a place like C Pa. where what you saw upstream was pretty much what you got.

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