Jump to content
  • Member Statistics

    17,588
    Total Members
    7,904
    Most Online
    LopezElliana
    Newest Member
    LopezElliana
    Joined

December 2022 Obs/Disc


40/70 Benchmark
 Share

Recommended Posts

39 minutes ago, ORH_wxman said:

The extremely amplified EPO ridge is often something that causes systems to trend colder inside of 7 days....we have been talking a lot about the developing monster NAO block, but in the early stages of that, we actually have a very stout EPO ridge dumping cold into Canada....see below.....this is what is starting to cause the flow to become flatter over the east....pressing the cold further south ahead of the Dec 6-7 system

 

 

Nov30_12zGFS120.png

Good point...in such patterns the models tend to underestimate the degree of cold dropping south from Canada in the medium-range. Hopefully we can continue to lower heights here but that's going to be one helluva battle between the SE ridge and one monster gradient. Could be a huge focal point for major cyclogenesis too. 

Link to comment
Share on other sites

5 minutes ago, TauntonBlizzard2013 said:

That run also drives home dryslots worst fear. Once the block starts to get established, really compresses things south 

 

5 minutes ago, SnoSki14 said:

Given the extent of blocking I could see a southern lean to the storms.

NNE & even a bit further south may get angsty at times. 

NNE best shot will be next week with two systems that will continue to trend colder. 

Link to comment
Share on other sites

20 minutes ago, OceanStWx said:

In some respect it's pointless to sweat the details of model runs this time of year. A good pattern will put snow down somewhere, and that will ultimately change the baroclinicity that affects future events. 

It's probably one reason (even if minor) that causes models to sometimes underestimate cold in a favorable pattern....on the front side of that, we may lay down snow pack in upstream areas and the models then struggle with how to handle that...and then of course, if the model guidance is wrong on where the snow pack increases, it will be wrong on its lower level boundary layer gradient in that area so all the future frames are corrupted too.

  • Like 2
Link to comment
Share on other sites

1 minute ago, ORH_wxman said:

It's probably one reason (even if minor) that causes models to sometimes underestimate cold in a favorable pattern....on the front side of that, we may lay down snow pack in upstream areas and the models then struggle with how to handle that...and then of course, if the model guidance is wrong on where the snow pack increases, it will be wrong on its lower level boundary layer gradient in that area so all the future frames are corrupted too.

Models are "smart" enough these days to recognize snowpack, the problem is that they will lay it down where they think it should go and as you say the effects cascade downstream. So for instance if we think we get a correction vector colder, we probably don't want to assume the storm that follows is a good bed where the GFS says it is.

Link to comment
Share on other sites

GEFS are trying to get that Dec 11 period in a favorable look for a larger type storm....a few days ahead of previous runs and particularly the EPS.

GEFS pop that Rockies ridge which is very bullish signal for a coastal given the block already in place

 

Nov30_12zGEFS252.gif

  • Like 4
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...