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Significant Ocean Storm March 6-8 2013 Discussion Part III


earthlight

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The Euro snowfall maps I have show a range across NYC from about 2-3" in Staten Island/s. Brooklyn to 4" ne Queens/n. Bronx.  Given the urban heat island, I think that's likely overdone for the sw 2/3 of the city including Brooklyn/Queens/Manhattan/central and sw Queens and s. half of the Bronx.

I agree-the airports might come out of this with a trace to less than an inch. If surface temps are above freezing, it will be quite hard to stick unless it's mod-heavy, and 0.2 every 6 hours isn't really good enough.

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So basically you think it's overdone for the whole city? Your explanation of where was a little confusing lol. Anyway I agree euro is a kind of just low enough on the precip to keep things mostly around or under an inch or 2 for NYC

I disagree, I think NYC sees between 2" and 3" for this... 3-5" for westchester and western LI, 4-6"+ for CT and LI, locally higher always possible depending on banding and how it sets up. Upton map looks dead on for this, except maybe cut a 1/2 inch off for NYC. They have really done a great job with this storm all things considered...

-skisheep

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I disagree, I think NYC sees between 2" and 3" for this... 3-5" for westchester and western LI, 4-6"+ for CT and LI, locally higher always possible depending on banding and how it sets up. Upton map looks dead on for this, except maybe cut a 1/2 inch off for NYC. They have really done a great job with this storm all things considered...

-skisheep

Last night's 2-4" they predicted for Nassau was a bust (verified no accumulation). I can see getting a couple or few inches tonight around where I am if things really kick up overnight, but I think rates will have to be higher than the Euro shows to really have a shot at something decent.

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I also really like Upton's map for round 2, maybe just leave the door open on the sw side there and call it 1-3 for NYC proper... Last night's stuff is a different show, I thought they were way too aggressive with it...Tonight will be cold enough once the sun sets..Also think the rates will be pretty good at times in the bands. 

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post-8652-0-89468700-1362682388_thumb.pnMy thoughts and guess for tonight and tomorrow. I apoligize in advance for the quality of the map, it's very crudly done... Keep in mind I have no meterological experience whatsoever, and have learned everything I know through americanwx.

 

-skisheep

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The main differences on the Euro are slight but important:

 

1) It has trended a bit stronger with the block at 500 mb.  It presses down from Nova Scotia into ME a bit more by Fri morning.

2) It has trended a bit further W with the center of the ocean low and a bit SE with the intensifying vort dropping SE from the Great Lakes (due to the stronger blocking).  Bringing the 2 closer together leads to greater/earlier interaction and helps pull the Atlantic moisture further west.

3) It also trended a bit further west (further into eastern SNE) on the firehose easterly jet at 850 mb by Fri morning.

 

All these things lead to heavier precip. extending significantly further west into LI/w. CT/interior SE NY/NYC

 

Good post - I hope you (the Euro) are correct

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attachicon.gifpotential snow map.pngMy thoughts and guess for tonight and tomorrow. I apoligize in advance for the quality of the map, it's very crudly done... Keep in mind I have no meterological experience whatsoever, and have learned everything I know through americanwx.

 

-skisheep

Hopefully you're right. If I get more than a slushy couple of inches that barely cover the grass completely, I'll be thrilled. Again I'm tempted to get on the Amtrak to Boston to experience the real show instead of being a few rows closer to the show on the sidelines (not the first time this season I've had the temptation).

 

What's Boston at for the season? If they get 10" from this (a real possibility) and Central Park about an inch, that should get them to well over double Central Park. An absolute feast up there for the last month.

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15z SREF is very similar to the euro in precip orientation...the only difference is that its probably 0.2in wetter. 0.75 gets very close to NYC this run. Everything is shifted SW basically 40 or so miles

That would match up pretty nicely with current radar showing precip pretty far SW, almost reaching Philly now, as returns keep on pivoting S and W.

It's also not too dissimilar to the NAM now. How are temps?

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15z SREF is very similar to the euro in precip orientation...the only difference is that its probably 0.2in wetter. 0.75 gets very close to NYC this run. Everything is shifted SW basically 40 or so miles

If you take the likely over done NAM group out, it's likely very close to the Euro.

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If the current radar gets some enhancement later and hopefully the temps finally fall, then maybe there's still a bit of hope for something.

The best enhancement looks to occur tonight into tomrorrow morning. Like jm said, I'm somewhat encouraged that precip has found a way to pivot into Philly without the best enhancement.

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If you take the likely over done NAM group out, it's likely very close to the Euro.

yup. We all know in here that the end result will be most similar to the euro. For the north and eastern suburbs its not too shabby. Were gonna have a nail biter in an around the city because it would only take slightly heavier precip to make this change from a slushy coating to an inch or 2, to 2-4 inches

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33 in Laurel Hollow with light Rain and Snow mix .....34 in Colts Neck with Light Rain .

 

The temps are right there , once the sun goes down I think the precip turns over everywhere as the heavier precip picks up .

Not a lot of QPF falls before 9 , so we are not ripping through out alloted QPF

The best snow is prob between 9pm and 6am

 

The Euro is 50 miles east of NYC with its .75 QPF , A wiggle west or you get caught under a band and you easily can get 4 in the park and 6 on the Nassau  Suffolk border .

 

Last nite was a different story , the best lifting was moving away from you , for a time tonite it will be moving in your direction .

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Below is what I just posted on a non-meteorology forum, just trying to help people out, as most of these folks are nowhere near as savvy as the folks on this board (well not all of them either, lol). Let's hope it works out this way...

So, while I'm still skeptical of getting snow out of this system, given how it has performed so far, I will say I'm much more confident in part 2 than part 1, as per the following. All along, the NWS and most good media pros (not the Lonnie Quinns of the world who were hyping the snow, but guys like Craig Allen, Nick Gregory and Lee Goldberg) were very uncomfortable with their forecasts of 2-4/3-6" (or even 5-8" in some cases) with part 1 - they kept qualifying their forecasts by saying a lot could go wrong - and it did. So, with that as backdrop, below is what the NWS in NYC said this morning and confirmed this afternoon (and confirmed by the Euro), in which they're calling for 2-4" in NE NJ (Union/Essex/Hudson/Passaic/Bergen) and NYC and 3-6" in the Hudson Valley, CT and LI overnight - in which they have "high confidence" in their forecast.

NWS in Philly is predicting similar 2-4" amounts in most of the counties that border the NWS-NYC area, i.e., Middlesex, Somerset, Morris and Sussex (although their map and forecast diverge, with 1-3" in the forecast for Middlesex/Somerset and 2-4" for those counties on the map, while Morris/Sussex do have winter weather advisories up for 2-4" of snow) and 1-2" in the counties to the west and south of those counties. Although having said that, the further south/west one goes, the further one will be from the precip and the greater likelihood of there being a bust. I could see a scenario where the real dividing line is the 287 loop (from SI around to Morristown), where inside the loop gets 2-4" and outside the loop gets less than 2". And hopefully, we'll cool down enough (and have no sun issues for most of this) to allow accumulations, not losing too much to melting.

.SHORT TERM /6 PM THIS EVENING THROUGH FRIDAY NIGHT/...

ALL SYNOPTIC SCALE MODELS SHOW THE UPPER LVL LOW/SHORT WAVE OVER

THE NORTHERN GREAT LAKES MVG SE AND ROTATING AROUND THE STRONGER

OFFSHORE UPPER LOW...FORMING AN INVERTED NORLUN TROUGH.

HIGH CONFIDENCE IN WIDESPREAD PRECIPITATION AMOUNTS RANGING FROM

1/4 TO 1/2 INCH LIQUID EQUIVALENTS MAINLY TONIGHT THRU FRI

MORNING AREA WIDE.

CONDITIONS ARE FAVORABLE FOR NARROW BANDING WITH ISOLATED 3/4 INCH

AMOUNTS.

BASED ON A NORTH WIND TRAJECTORY OVER LAND...SFC TEMPS SHOULD DROP

A FEW DEGS LOWER AREA WIDE TONIGHT THRU FRI MORNING CAUSING AN

ACCUMULATING SNOWFALL RANGING FROM 2-4 INCHES ACROSS NYC METRO TO

4-6 INCHES ACROSS SOUTHERN CT.

FOR THIS REASON...CONTINUED WITH AREA WIDE WINTER WEATHER ADVISORIES.

SNOW WILL END FROM NW TO SE FRI AFTN AS SUBSIDENCE ADVECTS SE

ACROSS THE REGION BY FRI NIGHT.

http://forecast.weather.gov/product.php?site=NWS&issuedby=OKX&product=AFD&format=CI&version=1&glossary=1&highlight=off

http://www.erh.noaa.gov/okx/stormtotalprecip.php

http://www.erh.noaa.gov/er/phi/WinterDSS.shtml

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33 in Laurel Hollow with light Rain and Snow mix .....34 in Colts Neck with Light Rain .

 

The temps are right there , once the sun goes down I think the precip turns over everywhere as the heavier precip picks up .

Not a lot of QPF falls before 9 , so we are not ripping through out alloted QPF

The best snow is prob between 9pm and 6am

 

The Euro is 50 miles east of NYC with its .75 QPF , A wiggle west or you get caught under a band and you easily can get 4 in the park and 6 on the Nassau  Suffolk border .

 

Last nite was a different story , the best lifting was moving away from you , for a time tonite it will be moving in your direction .

34 in Colts Neck? It's around 40 all around that area

http://www.wunderground.com/wundermap/?lat=40.43034363&lon=-74.40655518&zoom=8&pin=new%20Brunswick%2c%20NJ

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