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January Medium/Long Range Discussion


WinterWxLuvr
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When I say shockingly, ofc I am being facetious. The usual moving parts and still 6 days out. This is far from resolved.
The advertised pattern will continue to present chances. Given how things kicked off last week, I think we may have the 'luck' part working this time. 
For sure but what happens between 72 and 84 hours...only 3 days away seems to have significant bearing for the weekend so we should have a better hande in next day or so
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13 minutes ago, Ji said:
24 minutes ago, CAPE said:
When I say shockingly, ofc I am being facetious. The usual moving parts and still 6 days out. This is far from resolved.
The advertised pattern will continue to present chances. Given how things kicked off last week, I think we may have the 'luck' part working this time. 

For sure but what happens between 72 and 84 hours...only 3 days away seems to have significant bearing for the weekend so we should have a better hande in next day or so

The 2 primary things to watch imo are the speed of the ocean low moving up towards the Maritimes, and timing/location that piece of energy dropping in over the ridge from Canada. Look at the position of that shortwave on the 6z GFS compared to a couple runs ago. It was acting like a kicker and on the latest run there is more spacing between it and the Maritimes low, allowing heights to build to our NE. It tries to partially phase, pulls the coastal further westward and it gains more latitude. Who knows if the GFS has the right idea here but it underscores the uncertainty.

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1 hour ago, yoda said:

Morning AFD from LWX (4am update)

.LONG TERM /FRIDAY THROUGH MONDAY/...
High pressure will move into the region Friday, with cooler air
and a gustier wind as low pressure strengthens off the coast.
Highs will drop 5-10 degrees below Thursday`s readings.

From then, all attention is on the potential weekend snowstorm.
A great deal of uncertainty with this system remains, given the
long-wave trough over the region which could support intense
cyclogenesis (as depicted by the 0Z GFS). However, the
trajectory of the shortwave energy will make a huge amount of
difference as it dives south across the Plains later this week
and then rounds the base of the trough. If it ends up too
shallow, it could move off the coast before strengthening
significantly, as suggested by various model runs over the last
few days. If it ends up diving too deep, it could potentially
end up digging well to our south and remain there, as depicted
by the 0Z ECMWF and GGEM. 0Z GFS is near a golden sweet spot,
but this situation will likely evolve significantly over the
next few days as guidance gets a better handle on the
disturbances involved. In particular, the main shortwave energy
remains over the north Pacific south of the Aelutians, a fairly
data sparse area, which means guidance could change
significantly in any direction as better observational
information on the shortwave is included.

The one thing we are relatively confident in is that it will be
cold. With the trough in place and a fresh high pressure
building in behind the front later this week, temps likely
struggle to reach freezing over the weekend, particularly
Saturday.

This is a very useful disco. People should read this.

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22 minutes ago, winterymix said:

Monday, GFS 500 Z is wild and white.  Good patter, re-occurring toricity near us.  Peiodic chilly white falls of 2 to 4.   Stable reoccurring pattern.

So what you're saying is Monday's GFS is snowy and the pattern looks to be stable with occasional 2-4" snows in the advertised pattern....BRILLIANT!! Thanks Chance the Gardener

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It would be nice to see other models pivot toward the GFS current solution today and to see ensembles show some support.  Like a lot of our setups, until we get into the short range, it could go either way.  At least with cold air around we are in the ballpark.
Thanks for that
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Gfs has a southern stream type storm and track in the east but tracks first through Manitoba, Des Moines, St Louie. Not much of a jump/redevelop at all either. Not saying anything is impossible but when I can't recall a reasonable similar scenario at any time in the past, my doubt meter spikes. 

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47 minutes ago, winterymix said:

Monday, GFS 500 Z is wild and white.  Good patter, re-occurring toricity near us.  Peiodic chilly white falls of 2 to 4.   Stable reoccurring pattern.

Let me try and translate:

06z GFS is wild and white for Monday. Good pattern. Good vort passage, periodic chilly in the future. 2-4 is his first guess. then pattern stabilizes at some point later

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