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3/10 and beyond... all the waves threats


mappy
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11 minutes ago, NorthArlington101 said:

Everything seems to suggest an inch or two at minimum, especially SW. I'm eyeing it as a far less intense chase destination if I'd really just like to see an inch or snow before all is said and done.

Yea I’d def be ecstatic for an inch never mind two haha although it’s gonna be like mud city outside after it. 

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11 minutes ago, Weather Will said:

No one should care what the GFS says beyond 3 days.  Wait for the GEFS.

Corrected to reflect Weenie Rule #17: No one should care what the GFS says beyond 3 days unless it shows snow.  If it doesn't show snow, wait for the GEFS.

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Mood in the NYC metro thread certainly took a nose dive with todays runs talk about a pullback. UKmet went from 20+ at 00z along the coast near NYC LI to 2-3”. Inland still gets rocked. The gradient is intense. My parents place 30 miles inland gets over a foot while southern westchester gets a few inches. Classic marginal setup with a 87/287 fall line. I’d hate to be on the wrong side of that gradient.

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Our best threat is still after these miller B waves. But it looks like the better chance is the second of those (what would be wave 4). An illustration.  
 

This is the setup for wave 3 on the 12z GEFS. Euro 0z looked similar. 
5F67C85A-01B0-48EC-A2BA-4C07188BBF84.thumb.jpeg.6b24eb18253c2ad8670f286fd6be474b.jpeg
What’s new compared to a few days ago is X.  That NS feature coming across over the top changed things. It’s still not impossible but we need that feature to get out in front more. If they come across in tandem x suppresses Y. If X gets behind it likely pulls it to our NW. the win has to be either a perfectly timed phase OR x gets far enough in front to suppress the boundary but give Y room to develop.  It’s not impossible. Todays Gfs almost pulled it off. But X has made the equation more complicated. We don’t often do complicated well. 
 

But look at wave 4

70AE8BDE-0FDA-4958-9623-796C754979A7.thumb.jpeg.d32a0d9fc5229714bef6189b99079852.jpeg
Same good longwave setup. The pattern looks stable btw and unfortunately if we weren’t about to run out of clock we likely would get a snow from this eventually. 
 

But no sign of a NS feature to complicate this wave. The next SS wave is coming out of the SW. The longwave pattern in the pac will kick it out as another ridge tries to build into the west.   Blocking will force it east not north. 
 

Leads to this on gefs and eps 

29B88901-4828-448B-94A6-0233DB300D7C.thumb.jpeg.ca5f350a92ed63800da3d870f9ff087b.jpeg

2A4F6478-F952-4FBF-8C71-82196C7CEF62.thumb.jpeg.7361de86c2143356bb1d5256200b092b.jpeg

50/50 from whatever wave 3 does. Blocking. SS wave coming across under our latitude. No sign of a NS wave in the way. 
 

Now at this point a few days ago there wasn’t any indication of NS interference yet either. So that could pop up if the NS wave timing changes. That’s what happened to wave 3.  A NS wave trended way faster and is now over the top v back in the pac. Wave 3 could still work if that trend continues and that NS wave X ends up out in front enough. Wave 4 can also work. After that I think our clock has expired regardless of how great the pattern is. 
 

Unfortunately our best pattern is coming late. But we rarely win with the initial major amplification in the east in a blocking regime. Wave 1 and 2 are really both that amplification. They used to be one wave a week ago when guidance was spitting out some crazy stupid solutions. They ended up splitting into two waves so neither is a super storm. But we score more often after the major amplification as the pattern relaxes if a SS wave can take advantage while the boundary is still suppressed.  Just a shame that period isn’t coming until around the 17-24th. This is very similar to March 18 but we’re running about a few days behind from the SSW to the everything after. We all joked “wonder what happens if we got 2018 a little earlier”. The snow gods said “let’s see what happens if you get 2018 a little later hahaha”. 

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12 minutes ago, NorthArlington101 said:

12z EURO looks fine (biggest of the season?) for our further SW folks. Up north, it took NYC down to 4-6", which we'd obviously kill for but did cut their totals in half. Woe is them. Catskils still look like the spot to be.

1678694400-zOYsrUjFDzg.png

 

the heavy precip just dies at our door step. There is still time to get a stronger SS like the 00z had....but weak sauce low going under us isnt goign to cut it with marginal temps

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