Jump to content
  • Member Statistics

    17,586
    Total Members
    7,904
    Most Online
    LopezElliana
    Newest Member
    LopezElliana
    Joined

May 2022 Thread


weatherwiz
 Share

Recommended Posts

30 minutes ago, CoastalWx said:

It’s unsettled and much cooler now. All we need are NE winds. 

For sure. Definitely not a summer weekend. GFS trended a bit warmer, but Euro trended cooler and added the clouds and precip. Euro def caving more. GFS is still miserable on Monday too. 

Link to comment
Share on other sites

Can have a beautiful mid spring weekend on a Canadian airmass in late May. At this point, after looking at the tele’s, hoping the block flexes to send the door down to the mid Atlantic. We avoid the rain, and have dry mid 70’s. Not summer, but great for BBQ’s, hiking and camping. Best chances for a nice weekend with this setup are further north and east into NNE. 
 

Pretty damn remarkable timing. I mean, it’s probabilistically rare to muck up a 4-day window this time of the year. But here we are. Again.

  • Like 1
Link to comment
Share on other sites

Wrt to the Euro 00z run...

Not intended as prognostic or deterministic effort. This is just a scalar implication of that 192 hour synopsis.

Spanning the Corn Belt/Lakes region around 168 hours, a circumstance approaches a "Pacific NW" heat event.  Probably would not match that exceptional rarity that took place up there, late last June, but both then, and this Euro now, are examples of "synergistic heat waves. "  Their exact magnitude comparison aside, the phenomena is paramount.

24+ C, 850 mb temperatures looms over the entire region, with pock nodes to 25! (indicating 850 was adiabatically breached) over a region the size of Texas. 

Leading, modest seasonal rain deficits.  That will edge the thermodynamics toward the drier theta-e side of the "heat dome climate" typology.   Then, under solar max radiative forcing.  That is an over-lay of less-than-obvious initial conditions, silently interacting factors that support one another: the results exceed the more obvious (non-silent) input metrics. Earlier expansion under very intense sun, feeds heat back in... etc.  The system over-achieves.  

Hint, we don't want to over achieve +25C at 850 mb over Chicago under June Sun ;) 

Bottom line, connotes historic temperatures. It would be worth looking those up out that way, should this 192 ( would last thru D9 too), become more confident/urgent.  Possibly all-time of June.   That scenario on there looks on paper like antecedent circumstances are converging there.  

Questions is, ...where does that go?  Not sure it's going to ever get here...but that's close!

The Euro has been signaling this -PNAP surge for the last 3 days, ...the EPS has been on board with at least moderately expansive geopotential anomalies.  The -PNA over all is clearly the footprint hemisphere leading, so ... in wait of happenstance timed/embedded wave mechanics than super-impose a ridge genesis, is also a bit of a positive feed-back. The operational Euro run shows less restraint in synergizing all these factors.  The ens means of the GEFs and GEPs have been more similar to the EPS for May 30 thru June 4th or so during the last three days, which reflect solutions that don't support those erstwhile GFS close-happy offset.

  • Thanks 1
Link to comment
Share on other sites

6 minutes ago, Typhoon Tip said:

Wrt to the Euro 00z run...

Not intended as prognostic or deterministic effort. This is just a scalar implication of that 192 hour synopsis.

Spanning the Corn Belt/Lakes region around 192 hours, a circumstance approaches a "Pacific NW" heat event.  Probably would not match that exceptional rarity that took place up there, late last June, but both then, and this Euro now, are examples of "synergistic heat waves. "  Their exact magnitude comparison aside, the phenomena is paramount.

24+ C, 850 mb temperatures looms over the entire region, with pock nodes to 25! (indicating 850 was adiabatically breached) over a region the size of Texas. 

Leading, modest seasonal rain deficits.  That will edge the thermodynamics toward the drier theta-e side of the "heat dome climate" typology.   Then, under solar max radiative forcing.  That is an over-lay of less-than-obvious initial conditions, silently interacting factors that support one another: the results exceed the more obvious (non-silent) input metrics.  The system over-achieves.  

Hint, we don't want to over achieve +25C at 850 mb over Chicago under June Sun ;) 

Bottom line, connotes historic temperatures. It would be worth looking those up out that way, should this 192 ( would would last thru D9 too), become more confident/urgent.  Possibly all-time of June.   That scenario on there looks on paper like antecedent circumstances are converging there.  

Questions is, ...where does that go?  Not sure it's going to ever get here...but that's close!

The Euro has been signaling this -PNAP surge for the last 3 days, ...the EPS has been on board with at least moderately expansive geopotential anomalies.  The -PNA over all is clearly the footprint hemisphere leading, so ... in wait of happenstance timed/embedded wave mechanics than super-impose a ridge genesis, is also a bit of a positive feed-back. The operational Euro run shows less restraint in synergizing all these factors.  The ens means of the GEFs and GEPs have been more similar to the EPS for May 30 thru June 4th or so during the last three days, which reflect solutions that don't support those erstwhile GFS close-happy offset.

I pray that never gets here.

Its funny how often the PNA and PDO are out of sync....I mean, obviously the former is much more stochastic in nature, but we pulled off essentially a neutral mean PNA in the aggregate for the DM period last winter during one of the coldest PDO's on record.

Link to comment
Share on other sites

27 minutes ago, 40/70 Benchmark said:

I pray that never gets here.

Its funny how often the PNA and PDO are out of sync....I mean, obviously the former is much more stochastic in nature, but we pulled off essentially a neutral mean PNA in the aggregate for the DM period last winter during one of the coldest PDO's on record.

Just adding an opinion here to that... Anecdotally based on my own observations, since the 1990s, that seems to be more and more observable - a kind of 'correlation breakdown' increasing in frequency.

All winter long it was remarkable watching the La Nina decouple, ...recouple, only to decouple... 

The MJO was faux attributed to forcing circulation modes, only to have the weekly publications have to abandon the previous week's assessment/causality.

Couple of examples of longer and intermediate terms teleconnectors there.  But even the intraseasonal/weekly modes have been less dependable.

 

 

 

Link to comment
Share on other sites

24 minutes ago, Typhoon Tip said:

Just adding an opinion here to that... Anecdotally based on my own observations, since the 1990s, that seems to be more and more observable - a kind of 'correlation breakdown' increasing in frequency.

All winter long it was remarkable watching the La Nina decouple, ...recouple, only to decouple... 

The MJO was faux attributed to forcing circulation modes, only to have the weekly publications have to abandon the previous week's assessment/causality.

Couple of examples of longer and intermediate terms teleconnectors there.  But even the intraseasonal/weekly modes have been less dependable.

 

 

 

That is exactly what I am driving at....yea, PNA is stochastic and prone to shorter term wave breaking, however, we are seeing the incongruency even at a seasonal level. This is something I have noticed in doing seasonal outlooks....you can't just assume positive correlation in the Pacific. You need to dig in and unearth more esoteric relationships, such as the tendency for east-based la nina to exert a powerful RNA presence in December. I think this is why la nina events of that ilk tend to improve later in the season, more like an el nino, as opposed to canonical la nina events, which tend to be front loaded. It was right there in neon lights within my data last season, but I completely missed the forest through the trees, and forecast that RNA pulse in January, instead. Dumb, considering my primary ENSO analog was 2010-2011, which was a harbinger of that very behavior.

Link to comment
Share on other sites

So I think what's gong to happen ... the oper. GFS will correct toward the Euro for the Mem day weekend.

The 00 renditions are in reasonable agreement, wrt to the handling of that trough eject through the MV at least through D4 ... but they part company rather extremely as that mess approaches the eastern seaboard. 

The GFS over-deepens the Rockies aspect on or around D6 ..7, and that causes the immediate downstream wave lengths to buckle between 90 and 70W. That scaffold grabs the vestigial trough remnant, closes it off, and sends it S astride the MA over the remainder of weekend - which I think is bs overall ...

My hunch is that the GFS tendency to lower heights in troughs and nadirs, too much, is causing all that. Fwiw - the 06z corrected the D4/5 west, and that immediately corrected the structure along the EC ( transitively) ...

As we age through these days this week, we'll likely see more solutions like the 06z ... 'fill' it in, wash it out, more so like the Euro.  

 

Link to comment
Share on other sites

25 minutes ago, SouthCoastMA said:

6z Euro trended less bad, i think

I didn't think the 00z Euro was that bad.  The 06z may be 'better' or whatever, but the 00z layout was weak gradient and UN-GFS like.

It actually looked like it had some convective nature to the QPF sourcing, ...maybe some entertaining thunder? But the 850s are mild to warm, and that whole thing opens up a little bit on the 30th ...

Anything is better than the GFS ... man. 

  • Like 2
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...