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Snow potential Thursday night and Saturday 1/19 to 1/21


Mikehobbyst

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I wonder what guidance Mt. Holly is looking at, I haven't seen anything which would change my zone over to plain rain yet. If anything I could see the mention of sleet.

Saturday: Snow before 2pm, then rain and snow likely. High near 34. East wind between 5 and 7 mph. Chance of precipitation is 80%. New precipitation amounts between a half and three quarters of an inch possible.

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Big difference here. The antecedent airmass is much colder and drier. If we keep the system progressive and relatively weak ie 12z runs, then the temperatures at the surface should be fine for most of the event.

I'm just saying that we could be throwing in warm low level moisture.....I'd go with sleet from Lido Beach eastward.

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Between half and 3/4 of an inch of what? Rain, sleet?

I wonder what guidance Mt. Holly is looking at, I haven't seen anything which would change my zone over to plain rain yet. If anything I could see the mention of sleet.

Saturday: Snow before 2pm, then rain and snow likely. High near 34. East wind between 5 and 7 mph. Chance of precipitation is 80%. New precipitation amounts between a half and three quarters of an inch possible.

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I'm just saying that we could be throwing in warm low level moisture.....I'd go with sleet from Lido Beach eastward.

It won't take much to completely ruin it from here eastward. We absolutely need the wind direction to stay northerly and the coastal front out of here, or we spike way up in a hurry. We really need a weaker, southern solution like the 0z and 12z runs mostly had. If we get the usual north bump at the end, it's likely predominantly rain even here.

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Big difference here. The antecedent airmass is much colder and drier. If we keep the system progressive and relatively weak ie 12z runs, then the temperatures at the surface should be fine for most of the event.

There's also quite a difference between water temps in the low 60s in late October and in the mid 40s now.

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Don't forget, SWFE are notorious for coming north last second. The reason why this may not come north as much or none at all, is because the s/w is so weak and we have some confluence to our north. The srly trends may be right and the NAM may have a burp run, but it's not a total shock if it happens.

BTW, euro ensembles were just a tiny bit north of the op, but overall seemed very similar.

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I just looked closely. You're right.

You can tell its still also south because it gives NYC area about .40" of precip, and north of Boston only about .20" of qpf.

Also, at hour 48, the 540 line is on top of NYC and all the precip is done by then. 12z NAM had the 540 line just north of NYC at hour 54. and 12z GFS had it in the same spot the 18z rgem had it.

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From Mt. Holly's HWO for Warren, Morris, Hunterdon, and Somerset counties in NJ:

AN INCH OR TWO OF SNOW IS POSSIBLE LATE FRIDAY NIGHT INTO

SATURDAY MORNING. THEN SOME FREEZING RAIN IS POSSIBLE ON SATURDAY.

For Mercer, Middlesex, and Monmouth counties:

A WINTRY MIX OF PRECIPITATION IS POSSIBLE FROM LATE FRIDAY NIGHT

INTO SATURDAY MORNING. SNOW ACCUMULATION OF AROUND ONE INCH IS

POSSIBLE BEFORE A CHANGEOVER TO RAIN ON SATURDAY.

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From Craig Allen...

Craig Allen On-Air Inc

Still just looking like light snow or flurries first part of tonight. Since it's rather cold, it will be a fluffy snow with a dusting to an inch or so. Tomorrw still looks cold and dry. And as mentioned in the previous post, some weather models have trended colder with a more southern track of the Friday night/Sat system. The nam has not. While indeed a more southerly route, it continues to bring warming in for the last 3 runs of 6z to 12z to the latest 18z, because 1) no source of cold air to the north of the storm 2) SE to E wind 3) water temps still unusually mild offshore in the mid 40's 4) 850 0° is up towards I-84. This would negate a moderate snow across L.I. and down NJ- probably y even the City. North & west suburbs could see several inches bfr a possible mix. Lets see which scenarios trend towards whom (snowier or wetter) over the next run or two before accepting the bold proclamations snowfall estimates by a few who are already on their megaphones and shouting it out

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That was the last thing I saw coming after seeing the models last night... basically looks like a 3-5 inch event from NYC and further north, although I'd still be concerned about mixing for NYC with the 850mb line coming north, although surface is cold throughout the event perhaps there could be just enough warming to change the precipitation type over to sleet towards the end of the storm.

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Don't forget, SWFE are notorious for coming north last second. The reason why this may not come north as much or none at all, is because the s/w is so weak and we have some confluence to our north. The srly trends may be right and the NAM may have a burp run, but it's not a total shock if it happens.

BTW, euro ensembles were just a tiny bit north of the op, but overall seemed very similar.

Thanks Scott. I said last night that every SWFE I can remember has, at the very least, ticked north at the last second. The only two exceptions I can remember both occurred during periods of blocking.

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Well if that's the forecast for Warren and Morris the rest of us are certainly screwed. Interesting to see a large difference between Upton and Mt. Holly in the reverse direction. Usually upton is more conservative and they are going with 3 to 5"+ now

From Mt. Holly's HWO for Warren, Morris, Hunterdon, and Somerset counties in NJ:

AN INCH OR TWO OF SNOW IS POSSIBLE LATE FRIDAY NIGHT INTO

SATURDAY MORNING. THEN SOME FREEZING RAIN IS POSSIBLE ON SATURDAY.

For Mercer, Middlesex, and Monmouth counties:

A WINTRY MIX OF PRECIPITATION IS POSSIBLE FROM LATE FRIDAY NIGHT

INTO SATURDAY MORNING. SNOW ACCUMULATION OF AROUND ONE INCH IS

POSSIBLE BEFORE A CHANGEOVER TO RAIN ON SATURDAY.

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This might end up like the late October snow with the forecast from Mt. Holly and Upton going up in terms of snowfall, especially around the city and its immediate suburbs.

I knew the October storm was going to be a bigger storm when I woke up in the morning and at 930 there were raindrops that when they hit your car exploded and melted because they were a 1/4 snow at that point

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18z NAM still looks decent for places near the city and north on the new Ewall snow map, if not even better north of NYC, but the cutoff south of NYC is more noticeable on this run. The increased QPF could be the reason that NYC still has nearly 4" as the soundings on Twisterdata show a changeover after 15z, with at least some mixing at the end of the storm for NYC looking likely IMO regardless of how much snow falls at first.

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