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NYC/PHL Potential Jan 11-14 Event Discussion Part Two


NickD2011

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Not a glorified SW flow event...this is the furthest north any model has driven the primary. Wouldn't put my money on it. Good sign that even though it's developing it so far north...good snows are still falling as the coastal develops.

I don't know - it may have signaled a trend for the rest of the 00Z suite, maybe not. At this time range, it probably doesn't really matter

But this particular solution, especially with the primary gaining so much latitude smells of a "shallow layer of warm air at midlevels" scenario with the primary so far to the west... NYC might be a snow-sleet-slot-snow scenario with diminishing confidences as you go down that line. ;) .

p.s. driving through the back roads of W.Ct today on my way to the train was a surreal experience... felt like driving through Northern New England ... 15-18" of snowpack will do that to you.

p.p.s. this winter is starting to remind me of a delayed 1996... I was a sophomore in HS that year with only The Weather Channel and local stations to track. I'm actually kind of thankful the internet wasn't widespread then or I'd have gotten zero work done!

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actually falls in line pretty well with the SREF, it just so happens that it too shouldn't be trusted so much in this range

you can't help but wonder since the models have clearly trended toward this type of solution over the past day or so

i don't know how much they trended. The nam is the furthest west. Ggem,gfs,euro,nogaps,ukie are no where near this depiction and all at 12z runs trended east or stayed the same.

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The NAM is ugly for parts of the northern Mid-Atlantic. Although NYC and PHL stay all snow, the margin for error in the soundings gets too close for comfort. LGA actually goes over to rain for a brief time as per bufkit. Atlantic City is in horrible shape e.g. at hour 78, the column from 800 mb to the surface is all above freezing. At 81 hours, the column from 825 mb to the surface is above freezing. At 84 hours, it cools sufficiently for snow. ISP is a driving rainstorm through 84 hours.

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Well in the past 2 years AC has had a decades worth of snow so I would expect them to revert back to their norm of changing to rain in these situations

The NAM is ugly for parts of the northern Mid-Atlantic. Although NYC and PHL stay all snow, the margin for error in the soundings gets too close for comfort. LGA actually goes over to rain for a brief time as per bufkit. Atlantic City is in horrible shape e.g. at hour 78, the column from 800 mb to the surface is all above freezing. At 81 hours, the column from 825 mb to the surface is above freezing. At 84 hours, it cools sufficiently for snow. ISP is a driving rainstorm through 84 hours.

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The NAM is ugly for parts of the northern Mid-Atlantic. Although NYC and PHL stay all snow, the margin for error in the soundings gets too close for comfort. LGA actually goes over to rain for a brief time as per bufkit. Atlantic City is in horrible shape e.g. at hour 78, the column from 800 mb to the surface is all above freezing. At 81 hours, the column from 825 mb to the surface is above freezing. At 84 hours, it cools sufficiently for snow. ISP is a driving rainstorm through 84 hours.

A good forecaster once told me rarely in a storm that has ANY component that is more north of east than say 070...basically indicating you're dealing with a coastal and not a west-east clipper does ACY and NYC both see good snow or all snow...either one cashes in or the other completely misses, sees all rain, or most of the time changes to rain in the case of ACY...this is a classic storm where JFK may see mostly snow but central coastal NJ sees rain mixing in.

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The NAM is ugly for parts of the northern Mid-Atlantic. Although NYC and PHL stay all snow, the margin for error in the soundings gets too close for comfort. LGA actually goes over to rain for a brief time as per bufkit. Atlantic City is in horrible shape e.g. at hour 78, the column from 800 mb to the surface is all above freezing. At 81 hours, the column from 825 mb to the surface is above freezing. At 84 hours, it cools sufficiently for snow. ISP is a driving rainstorm through 84 hours.

Don,

So, in other words, an average winter storm historically speaking. Rain on the coast, dicey in the cities, and snow further back more likely. Not saying that that will happen. After all, we are talking the NAM 84 map.

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