Hope someone can help me with this... Teleconnections!!
I have been trying to understand the posts by Steve Murr and Glacier Point etc... and I am finding it all extremely interesting but it is like trying to learn another language! (Even the help Guide-sorry Steve)
I think I have got to grips with positive NAO. Azores high Greenland low etc.... However am I right in asssuming that it is the positive NAO that causes the jet stream (can someone please define "jet stream") to be strong from (the USA or southern Atlantic?) which causes zonality across the UK in the Winter.
If the NAO is negative then the difference between the Azores anticyclone and Greenland low is much less causing weaker jet stream and less zonality and hence less mild wet weather as we don't have the relatively warm,moisture-laden lows from the Atlantic and it opens the door for air to appear over the UK from other areas depending upon where the high pressure is at that time. E.g if high pressure is to the North of Uk then polar air masses may move down and then across the UK?
Neutral NAO??? :huh:
OK now this is where I get completely stumped. The Pacific Jet is this the part of the jet stream that crosses the Pacific Ocean and hits western USA? Is the Pacific Jet the winds that cause the PNA (Pacific North American Pattern) as in Steve Murrs "guide to Teleconnections"? If PNA is neutral, can this have an additive effect on the jet stream, causing a weak atlantic (is this a.k.a. subtropical jet stream??) jet stream to have a kick up the backside?- so perhaps a return to zonality (cyclogenesis?)?? Is this effect augmented further by a Positive PNA? (Negative PNA jet moves to the south of the UK?) Or is this complete nonsense (politely put!) :lol:
(Is there a jet stream from the USA or is this the subtropical jet ?- does this move up the Eastern coast of the USA but originates from the Azores High?) Is the pacific jet , jet stream , subtropical jet etc all the same wind/ moving air mass progressing over different parts of the world but in one continuous loop that can be split (bifurcated?) or moved from its normal path to a more southerly or northerly direction according to its strength and areas high pressure?) aagh!!
What is the AO? (Atlantic Oscillation?) and then of course there is the QBO, the PFJ...........sorry to use abbreviations but I do not know the proper terms.......
.....the ENSO (-Southern Oscillation? -High pressure in the Pacific, low pressure in the Indian Ocean??-something to do with the El Nino-(ocean warming in the coastal regions of Peru and Equador/Pacific??) Maybe we'll leave that one for a while!
Plus do the trade winds have different names?? Are trade winds surface winds whereas jet stream is higher?
I don't ask for much do I :blush:
Sorry to be a nuisance but any assistance (no matter how small) in trying to understand quite complex (IMO :huh: ) topics would be gratefully received.
Cheers all
Daisy Dullard!