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October Discussion


TalcottWx

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Up down up down...rinse repeat.   This rendition features, nothing...  If you were hoping on the active pattern (in terms of deeper storminess however well or not it related to winter characteristics) the last 24 hours of modeling tempo and indeed, to a goodly extent their respective tele suggestions ... all point to minoring out transitory air mass changes in a flattish type of flow that may actually feature more above normal temperatures than the other way around (I think Scoot or someone mentioned?). Tho ... an individual pop of Canadian tugged air on the heels of a fast moving open wave might get you cold for a 12 to 18 hour period; by and large, yesterday's "weak" Archembault signal all but entirely disappeared overnight in the teleconnectors (interesting). 

 

This may all be red-herring, as is so typical of autumn transition season.  If there is ever a time of year to witness whole-scale discontinuity in the mass-fields on a quatra-Hemispheric scale (or even larger...) than fall is the time to do it.  Very difficult time of the year to forecast middle and extended ranges ... more so than the usual sarcasm and fang-dangling barbs, too.  However, I am not so certain a more curved planetary wave structure won't return given time; the longer term propensity to do so needs a longer absentia for me to buy into the notion that it's over; also, the MJO is predicted to strengthen in Phase 1.. We'll see.

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The day 7 system has BIG potential written all over it. The 00z ECMWF trended towards a storm in a big way and the 06z GEFS ensembles were a lot more enthusiastic than 00z. Now the 12z GFS OP was very close to pulling the trigger but was just a tad too late to develop things. As is, it would bring a round of light snow or flurries to inland locations very late Halloween night into early on November 1.

 

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gfs_namer_186_500_vort_ht.gif

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I guess the period of amplitude/potential has been more highlighted by the Euro and GFS operational versions ...with some at times less support by their respect means.  But usually ... when the two big kahunas agree on an aspect, their means will in time crumble and cede to them.   We'll have to see if this is one of those times.

 

Period of amp = higher confidence

Exactly what = no way to tell.  

 

There is a modest dip in the NAO at both the cdc and cpc, but this can be as much just a transient result of the trough digging in ... more so than a lead enforcing mass field.  The domain doesn't 'look' very negative leading in, is all.. Again, yesterday there was a reasonably clear Archembault type system flagged during the concerned period of time, but the overnight ensembles?  EEwe, not where to be seen.  Major flip floppage there suggest preceding with a good dose of incredulity re any solution is prudent.

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You guys make it sound like this GFS run is all by itself. The 00z ECMWF gave northeast NY 2-4".

 

Not that anyone asked but it kind of makes sense that the Euro was warm, west and so deep... The model tends to have a bit of a depth bias with eastern N/A troughs beyond D5... 

 

The determinism is inherently low ...perhaps helped some by blend of the GFS typical slight progressive bias against the Euro's slowness -- 

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ah, is there something against Isentropiclift ?   

 

anyway, before much happens there are some other notables;  namely, what a gem tomorrow will be for the murk beleaguered SNE folk.  Lots of blue, and quite mild relative to recent times.   Mid 60s with tepid/warm sun amid clear, clean calm air is going to be down right utopia by comparison to say ...yesterday at dawn.  Although ... could pancake cu for awhile, but it has that appeal of busting back out into sun at 3 after the atmosphere's turned over and mixed out some RH. 

 

Also, there could be a fairly goodly warm up around D4/5 prior to any trough amplitude/concerns thereafter.   Obviously with the utter pre-occupation for winter that's ever rising it's fervor, few probably haven't noticed .. but could knock 70F in there.

 

Just saw the Euro through 120 hours ; with that pig vortex sinking in latitude SSE of the Aleutian Island archipelago that west pop east dive sea-saw should be in effect thereafter...  

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Is that the reason you can't trust the d7 GGEM? ;)

Not at all, I wouldn't trust the day 1 GGEM, especially lately.

 

We all know the GGEM is just about as good as the 84 hour NAM, if not worse.

 

Sometimes the GGEM can be matched against the Euro when trying to determine if a less progressive solution is more correct.

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ah, is there something against Isentropiclift ?   

 

anyway, before much happens there are some other notables;  namely, what a gem tomorrow will be for the murk beleaguered SNE folk.  Lots of blue, and quite mild relative to recent times.   Mid 60s with tepid/warm sun amid clear, clean calm air is going to be down right utopia by comparison to say ...yesterday at dawn.  Although ... could pancake cu for awhile, but it has that appeal of busting back out into sun at 3 after the atmosphere's turned over and mixed out some RH. 

 

Also, there could be a fairly goodly warm up around D4/5 prior to any trough amplitude/concerns thereafter.   Obviously with the utter pre-occupation for winter that's ever rising it's fervor, few probably haven't noticed .. but could knock 70F in there.

 

Just saw the Euro through 120 hours ; with that pig vortex sinking in latitude SSE of the Aleutian Island archipelago that west pop east dive sea-saw should be in effect thereafter...  

The 12z Euro is digging the trough all the way to the coast by Halloween with a nice ridge axis through Montana. Swing and a miss OTS this run. Not that far off from the GGEM FWIW.

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