eduggs
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Everything posted by eduggs
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On the HRRR, at 0z Sat (tomorrow), Orange County is at 2-4" while NYC metro is < 1". It's not the best angle of approach locally and there's still some concern there that the best banding could slide north and east into CT. On the plus side, the HRRR still manages respectable QPF locally and the low level convergence (inv trof) overnight Sat occasionally manifests as undermodeled localized banding.
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Nice run from the 0z HRRR for NYC north and east. It even keeps light snow going into Saturday morning. Sleet mixes in briefly to the NY border. But... major snow to ALB, plowable to ORH, and accumulating to BOS is a bit of a red flag for us. The 700mb low is getting pretty far northeast before getting shunted south... For now we're all still very much in the game but still feeling nervous.
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Playing catch-up with the afternoon's models and noticing that the 18z GFS is the best short range (24hr - 36hr) run for the ENTIRE NYC metro that we've seen in a while. An outcome like that would really spread the love. It's probably a bit optimistic, but still fun to see!
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Probably gonna be some big parachute flakes as the sleet line approaches with flakes sticking together in the near freezing 700mb layer.. especially if winds aren't too strong.
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It's cool to see solidly subfreezing temperatures in place for an event for a change. It looks downright cold in the lower Hudson valley tomorrow. It should transform the landscape no matter what wintry precip. falls.
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The heaviest precipitation will probably fall after sunset... but it would be nice to get an hour or two of accumulating snow during daylight... we'll see.
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In my experience, if the NAM shows sleet inside 48 hours, even if it's an outlier compared to other guidance, it absolutely can happen and often does. There is a good chance this run is north of the final outcome. But I really don't think the trend should be dismissed. The silver lining is a 2-5" snowstorm is possible for the metro even in the NAM scenario.
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Warning snows to Saratoga springs with advisory snows to Lake George. That's rarely good for us. We don't blindly follow the NAM, but we shouldn't ignore a multi-guidance trend. Good thing is the NAM is still cold enough for frozen precipitation for many areas even if the focus of heavy precipitation is north and there's more sleet now. It also would end as snow showers.
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The problem is all other guidance has been shifting north, focusing the snow northeast of the NY-NJ border. And we're squarely in the short range now. That makes it more difficult to dismiss.
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No good on the 18z NAM. Not what we want to see at all.
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Closer look it's actually virga. Snow looks to being in the afternoon on the model.
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Snow breaks out late morning on the HRRR for northern areas. Interesting that this has evolved into a Friday daytime event as opposed to a Fri night - Sat morning event.
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The pessimist in me says southwest of the NY-NJ border, this could turn into a quick (~2-4hrs) burst of steady snow followed by a period of light sleet and ending as flurries/snow showers.
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Not great micro trends for NJ. It would be nice to see the occasional southwest shift to counter the northeast nudges. But the changes have been happening early in the midwest, which makes it hard to reverse downstream. Maybe an inverted trof at the end of the event will overperform! What's bad for PA and NJ is good for NY and CT.
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The 18z EPS had a few members in that vicinity. And the GEFS had a few that were a little south but close. That surface track is possible though still somewhat unlikely. The mid-level low tracks are possibly more important.
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Flurries possible overnight? Radar, HRRR, FV3 etc say maybe. But only Santa will know.
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The 0z HRRR is very dry through 0z Sat. Yes it's the end of its range, but light precipitation is a concern of mine. 18z 3km NAM was too. There are mixed signals on the lift/forcing.
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As expected, the 12z RRFS adjusted the precip. shield northeast towards model consensus, but it is (like the FV3) still very cold and suppressed compared to other guidance.
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Quick glance at ICON and RGEM - didn't look like any major changes run to run. That should be comforting at this stage I think. The RGEM being north suggests the models taking it far south are not likely on the right track. The warm 700mb temps on the RGEM are a potential concern for sleet.
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I'm pretty sure the RRFS is much more accurate at 48 hr compared to 84 hr... similar to the HRRR at 48 hr.
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Counter to a few mesos being suppressed, the ECM-AI has ticked northeast with the precip. shield over the past 3 cycles. It's also interesting to note that it's on the opposite end of the envelope from the GFS-AI, which remains on the southern periphery.
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6z RRFS for reference only
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So we have a couple of meso-models driving this south with snow all the way down into Delaware. Are they onto something? Since the GFS, ECM, CMC, and their ensembles are in pretty good agreement as of 0z/6z, I'm going to speculate that the mesos are at the ends of their range and their convection allowing and hi-res qualities are yielding an unlikely result... We'll see.
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The 6z RRFS nailed Baltimore with a minor event for Philly and nothing northeast of Trenton. It's presumably unreliable towards the end of its range. I've noticed it sometimes clusters with the NAM and WRF family.
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The 0z CMC actually has ice ending as a little snow for Monday the 29th. This model was already the coldest for this event and it shifted even colder. Unfortunately it has close to zero support amongst the other ensembles. Then again, the thermal boundary has repeatedly trended colder in the mid-range recently...
