Jump to content
  • Member Statistics

    17,617
    Total Members
    7,904
    Most Online
    RyRyB
    Newest Member
    RyRyB
    Joined

Active mid December with multiple event potential


Typhoon Tip
 Share

Recommended Posts

So... some "lensing" and usage filtration going on ...lol - ... late to the morning party.

I wonder if anyone's posted the least snow fall total map presently offered regarding this event ...doing so with the same zeal and attitude of joy  -  ...yeah right. Lol

I was not personally impressed by the 00z suite in the handling of the Atlantic total pattern ... It's almost more in the 'complexion' of it - its hard to pick a discrete feature to demo this but it just sort of reverted by "attitude" toward a faster look ??  The 50/50 appears in the 00z Euro still, but it seem to be like... 4 deg of latitude more progressive so..noise?  perhaps.. .but, I the idea here was that the 'noise' should sound like going the other direction. And I don't see a lot of -NAO migration in the 00z suite regardless of model camp, either.  It seems yesterday's panache in that regard was not carried over so much into the 00z run -   ...  Fwiw, the 00z GEFs tele did also back off the -AO heading later in the week, and the NAO is technically positive albeit nearly neutral, along it's prognostic curve...so, again - we pick and chose the products we use at own risk I suppose...

Be that as it may, ...the system for late Wednesday doesn't necessarily have to have a slowing/back-log exertion from the a retrograde Atl tendency... To reiterate last night .. if the PNA --> PNAP nuance a better post ridge bulge in the west, than it can amp and slow a little form the opposing direction...etc..   Regardless of these plausible modulators ...it's middling impact fast mover.  I see it coming in like a wall 10 pm CT to 1am ASH and leaving by 10 to 12Z CT and mid morning up this way...

It's like middle ground needle threading - there's some interpretation variance on what "needle threading" means ( apparently ..). It's subjective anyway... but to me, it has always meant narrow latitude of impact, ...not really much else.  But usually, in fast flows... because the 'narrowing' and 'why' the flow is fast tend to be rooted in the same biases.  Such that 20 miles on the N edge of storm output means you're on the in or the out.   Dim sun to substantive accumulations over a short distance.  So on a mid range chart, you're looking at a rifle shot at 400 m and trying to hit your city, through the threads of your sight-scope.   . pilin' on metaphors...  Storms that slow down get more 'circular' in geometrical circumvallate  and that's why they are "bigger"...

I see this as having some of that needling, but sort of bigger hybrid version ... It is a fast mover - and it is moving through some compression in the heights... I don't see much evidence of "slowing down" - not sure where people are seeing that in any operational model. 

Link to comment
Share on other sites

It is amusing watching Weather.com. Last night, they had 5-8", and 5-8" for Philadelphia on 12/16 (day and night respectively), then 8-12" and 5-8" before I went to bed, and now 3-5", and 5-8". 

I get that it is physically possible for Philadelphia to get well over a foot of snow in a La Nina December. We're running at record snow here in a La Nina since 1930-31, and close to record snow for the date (around double average for 10/1-12/12), and Boston had record snow in this part of the pattern in October.

My research says higher snowfall La Ninas are much more likely in the NE above 150 ACE (1933, 1995, 2005, 2010, 2017) in the Atlantic, and also that low-solar La Ninas are better than the high-solar La Ninas for snow in Boston in particular (usually around 50"). 

I'm still skeptical of something that high so early for Philadelphia. It was interesting seeing 1947 on that list for NYC though for top late-Dec snows, that's been a very similar year for national snowfall anomalies since Fall. This is roughly your list of 6"+ daily snows in Philadelphia in December. This is all Decembers from 1931-2019. So forget La Nina, a daily total over a foot in December is just very rare in Philadelphia. The 1932 storm is the one I'd look at hard, as it's the closest date, with some similar ENSO/Atlantic/Solar things going on. Even 6.0"+ in a calendar day is like ~12 days in 90 years for Philadelphia (a couple more would show up if you did storms that started at 6 pm and lasted to 6 am the next day).

22.5" - 12/19/2009

12.4" - 12/24/1966

11.6" - 12/26/2010

10.9" - 12/12/1960

9.2"   - 12/19/1945

9.0" -   12/30/2000

8.6" -   12/08/2013

7.4" -  12/19/1948

7.4" - 12/26/1947

7.3" -  12/17/1932 (ahem only other year with a cat 5 hurricane in Nov...)

7.0" - 12/05/2002

6.8" - 12/12/1982

  • Thanks 1
Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share

  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...