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September weather discussion


Ginx snewx

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euro's rather boring...slows up the front enough to ruin sunday and monday...then merges the energy offshore with some sort of tropical feature so Nova Scotia gets whacked...then the southern energy escapes eastward out to sea. 

 

it's not far off from something more entertaining but not much to be excited about on that evolution.

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Hopefully front flies thru like has been progged on Sat nite so Sunday afternoon is dry and sunny..Euro up to it's shenanigans again

The GFS prefers Sunday too. I think the only model speeding things up was the NAM and I'd take that with a grain of salt 84 hours out...

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Fyi,  NCEP didn't include the GGEM and UKMET ...citing them as westerly outliers overall.

 

What I am seeing in all guidance is evidence of typical transition season vagaries with the latter middle and extended ranges -- more so than normal variability.   

 

The 00z Euro and the 12z version are significantly variant in sensible weather impacts.  In fact, pretty much could not be more different at 100 hours comparing relevant time intervals.   One has a coastal impactor, the other had a beautiful early autumn polar high settling over in preparation for a significant warm-up.  

 

Meanwhile, the GFS did kind of the opposite, with the 00z being more progressive with the eastern trough, replacing eventually with mean ridging, and the 12z showing more troughing and surface response for a bit longer.  

 

Straight up blend probably takes a flat wave and garbage close but too far S other than to excite some onshore flow for 18 hours.     

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The Polar vortex retros into Siberia which means cold is limited here. Maybe it's only first half of the month, but that's what I see.

yep and load Siberia with snow. Radarman Eric has a good sense of how the above normal SSTs in the GOA lead to a strong Pac jet because of the temperature difference between the Arctic and Pac, this leads to a West trough East Ridge with a trough off to our East for the start of October. FWIW the LR progression of this pattern leads to an ultra sweet winter pattern with a pos PNA NEG NAO predominant winter. Load Siberia in October please.
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Those SSTs in the NPAC could easily change so I'm not a huge believer in them driving the pattern right now. Besides the general pattern for the last few years has been for the PV to be in other parts of the globe. But yeah, looks good for the start of Siberian snow pack which perhaps means more down the road for us.

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Those SSTs in the NPAC could easily change so I'm not a huge believer in them driving the pattern right now. Besides the general pattern for the last few years has been for the PV to be in other parts of the globe. But yeah, looks good for the start of Siberian snow pack which perhaps means more down the road for us.

He makes good points about lag effects.
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He makes good points about lag effects.

When you have water temps so cold to begin with, the amount of energy available isn't necessarily there to really drive the pattern. IMHO, those SSTs are the result of the pattern set forth and lack of recurring TCs. It has slowly cooled some, but still relatively warm. To me, this is probably the result of a larger scale issue. Expect those temps near AK to cool further.

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When you have water temps so cold to begin with, the amount of energy available isn't necessarily there to really drive the pattern. IMHO, those SSTs are the result of the pattern set forth and lack of recurring TCs. It has slowly cooled some, but still relatively warm. To me, this is probably the result of a larger scale issue. Expect those temps near AK to cool further.

exactly why you see that screaming jet setting up now through the first half of October, again rolling this forward leads to good times. Those temps have to cool with the Jet south of AK, common sense.
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exactly why you see that screaming jet setting up now through the first half of October, again rolling this forward leads to good times. Those temps have to cool with the Jet south of AK, common sense.

The pattern going forward looks fine. I don't see mega torch and we should try to build snow in Siberia. Sounds good to me as a start.

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