eduggs
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Everything posted by eduggs
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18z NAM looking surprisingly threatening for some of you guys. Pretty noticeable change from last run. Much sharper southern stream shortwave. I hope it's real.
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The 18z NAM looks a lot more threatening for Monday than the previous runs. Significant changes. Southern shortwave is much sharper this run. That looks like it would produce a decent snowstorm in the mid-South through parts of the mid-Atlantic. We'd still probably need a little help to get snow to our region, but if this run is onto something real, it's something to watch for sure.
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I've seen plenty verify as snow, especially in the higher terrain of VT and NH. Low level temps in the coastal plain are often problematic. Ana's are kind of what we call the rare scenario in between the full cyclone and frontal crossing. I agree most do go one way or the other.
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That's good advice. Analfrontal is deviant, especially for sucked weenies. What the 18z GFS is showing isn't really anafrontal. If you only look at the surface graphics, if looks like that. But if you look at H5 and H3 you see there is a legitimate southern stream wave. Problem is there isn't enough support for this robust look right now.
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I recall a few times this year when the GFS wrapped up a southern stream wave and produced backside snow in the medium range when most other guidance did not. In every case, the northern stream ended up being too fast and the southern stream vortmax never made it to the downstream side of the longwave trof. The result was a positive tilted trof, squashed southern stream wave, and a frontal passage. Nobody trusts the GFS showing snow with this and probably for good reason. But there's just enough support from the EC, UK, previous CMC runs, ensembles, and even the ICON to completely dismiss it.
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We know individual model runs are not accurate in the long range. Ensembles are better but still not very good beyond 7 days. We look mostly for hope, but I don't think we should expect consistency.
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The CMC is not close for the Monday coastal. And it trended in the wrong direction.
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Yes. The 500mb vorticity charts would support a light to moderate snow event right along the coast. A few individual ensemble members sharpen the trof in the SE like the 6z GFS did, but the other global models mostly keep the trof positively tilted and slide a harmless front through the area. We need to see more model support to believe it.
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The 06z GFS actually looked like the classic rain to 3-6" snowstorm for the coastal plain that I remember from the 80s and 90s. H5 looks solid for a moderate event near the coast. The problem is nobody believes it won't be gone in 20 minutes.
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If there is an actual vortmax at the base of the trof and not just strung out frontal vorticity. And if that vortmax rounds the bend somewhere in the SE and initiates a negative tilt and baroclinic leaf formation, then that is not anafrontal. The 06z GFS was pretty close, but probably fraudulent. Plenty of individual ensemble members show something similar, but we need the other globals to sharpen up if we are to seriously entertain the rain to snow possibility.
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Already gone and caved at 18z.
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With a very wintry looking radar signature, Binghamton (1600 ft) is at 32 with light snow 1mi and Ithaca (1100 ft) is 35F. Crazy warm relative to season and synoptic setup. It's like an April event.
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Things not looking so good in the medium range. But at our lat-lon they almost never do. The longwave trof axis looks to remain pretty far west predominantly. But we just have to get a little lucky with the timing of features. It doesn't look hopeless, just not imminent.
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0z NAM is noticeably north for Tue. night. Probably almost time to give up on much frozen south of the Catskills.
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Yeah looks like some lightning with those. Thunder ZR?
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The 18z NAM shifted slightly south with the frozen precip for Tue. night. Looks like up to a few tenths frozen down to northern Sussex and Orange/Putnam. Some sleet south of there to the northern NYC burbs.
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The 12 EC keeps most of the snow for Tue night up along the PA/NY border through the Catskills. The I-84 corridor looks to be right on the southern edge. Definitely bears watching but it's hard to see it sliding much south of there.
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Full on blue sky and sunshine a little while ago in NW Morris County. A few clouds now. Temp has spiked to 40. It has turned out to be a really nice outdoor day afterall. Good job by the NAM showing essentially nothing measurable locally with this first batch. It appears to have resolved the low level dry air well. Same with the RGEM. The radar matched the sim radars pretty well, but the globals were a little too generous with QPF.
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Few flakes mixed with a few breaks of sun. Nice day for a winter hike.
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The lower levels are finally moistening up, but it looks like we've lost most of the lift. Showery IP would be preferable to ZR or rain later today, but I'm thinking most outside the far north go over to liquid.
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12z GFS sounding for Tue. night looks nearly isothermal below 850mb down to almost the I-80 corridor in NJ stretching across the LHV. I could see any banding that sets up and survives the eastward trek through PA possibly flipping the column to snow pretty far south, at least briefly. It definitely looks interesting Sussex, Orange, Putnam counties and north. The NAM looks like more of a mix ptype from the soundings. Don't have soundings for UK, CMC, EC but they are close to a wintry event for this area.
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mPING reports show snow getting closer. But the radar is also drying up.
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Lots of virga so far. Not sure many places see much snow with this. Some guidance holds off until later when it goes right to ZR and light rain. Tue. night continues to look interesting - as Walt has been highlighting - for extreme NWNJ through the HV. The 06z shifted slightly south into Sussex and Westchester with the snow line. NAM, CMC, EC are a little further north from I-84 to the PA-NY border. There's potential for a light plowable snowfall in a fine line wherever this frontal boundary sets up. It would be fun if this shifted further south. Something to watch...
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It should cool down a bit Sunday night and there's a bit of a northerly cold drain at least until early Mon. on current guidance. Even if it's a little warm on Monday, the low level dry air could allow wet bulbing down to near freezing if precip. materializes. Still obviously too far away for confidence.
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The Monday deal could easily punch warmth too far north or get shredded. Riding the narrow cold leading edge of a warm front is a tricky proposition. The important thing is there are a few medium and larger range wintry threats to keep entertained for now.
