Could be a good bit of variation to the coming week; wintry to Wednesday but perhaps feeling more like mid to late April for a time this weekend as we once again see strong LP development in the western N. Atlantic scooping up a huge wedge of subtropical air and throwing it our way.
This has been a common theme these past few months, with frequent plunges of deep cold across large areas of the U.S. - so it's been like taking last winter and shifting the main storm development zone a thousand miles or so west.
It could serve us some exceptional warmth at times next month if the pattern persists. Obviously the intensity of the U.S. cold will soon start to fall markedly as the increased solar insolation makes itself felt, so we can't be looking to that mechanism for all that much longer. Hopefully it will evolve into an adjusted version of last spring through summer, in which the main area of suppressed Atlantic SSTs is further west than it was last year (at that time it was often between the Azores and the UK), encouraging LP development further west, allowing the fine, dry spells to be even longer lasting but not entirely unbroken (need a few thunderstorms here and there)
You see I have a (loose, unproven) theory that last winter's persistent intense cyclogenesis just west of the UK led to the development of colder than normal SSTs not far west of the UK which then encouraged LP development in that area through the spring and summer due to enhanced temperature gradients moving into the colder than normal region from the near-normal region to the south.
In light of which, if my feat of hopeful imagination above happens to verify, I'll be starting to take that theory quite seriously...
There I go wandering off topic again, I'm getting out of practise what with my recent near-hibernation following what has been a bit of a letdown these past few weeks relative to what once looked possible.
With some more interesting conditions to come next week, it should be easier to meet my usual standards again... here's hoping
Originally Posted by: Stormchaser
I quite liked the way you said all that, much parts made sense as well.
I have taken my observations that we and the USA North Atlantic and Pacific big picture it showed North South Two Cells link up Low's Mid November to Now close to W and over NW USA and in NE Pacific it dominated there, dragging mostly above Average Temperatures at NE Pacific to much of Alaska far West USA with a large series of warm episodes (Mild on some periods South USA and West to SW USA.
Some Low's moved across SW USA and NW USA numerous times especially in the middle winter period this winter, Bringing Cold Snowy conditions in Central N and Mid to East mid and NE USA.
The Siberian and Arctic High affected much of the West Central USA and there were medium or small Artcic Low Pressures often move SE from the NW off Greenland from the Canada and it's Artic Archipelago moving SE to go Over the West Central N USA High that also occurred regularly so the Arctic Low's affected NW and at times Central and more regularly NE USA, with the Low's in South and SW USA and Northwest and NE Gulf of Mexico tracking NE across South Central and Eastern mid NE USA at times which also helped the Cold Spells regularly establish and dominate long periods for them US people.
PFJ Southern Branch was very busy for us and the USA for in Especially more so Jamuary and February, though December was not differing much.
Heavy Snow for them was created by both the Weaker Northern Jetstream Arm with curvy west to east trajectory and the Wetter More both Warm mild at Southern Jetstream Branch for South midsection USA to East USA in Dec- Jan, but this I think was less active for half month in November 2014.
The North Atlantic Pattern as well as for North and NW Europe inc. South and West Central SW side of Europewas generally directly feeling the impact of the Jetstream as well as the Azores High influences to our UK and Wider Europe weather, talk big picture.
The Southern Arm of our Jetstream chased on and at times linked with the Northern Jet Branch this stopped parts of South SE Central UK to see not to lengthy cold or wintry showers of snow to occur.
January 2015 has been the colder month with December mixed with more frost than in February, quite a number of widespread night frosts occurred in January with at least upto 10 or 12 in December for Wanstead Area of London.
There was a frost last night at 0 deg. C, but I'm February not as much frosts as in December 2014.
The Low Pressure Systems in North Atlantic also dived regularly through NW Europe across West and South to Central and Also SE Europe at times, with Systems to North and NE Europe bring SW flow or NNW cold winds though some areas of High Pressure affected West NW and Central to East NE Europe which was likely helping to stop the Cold NNW SE tracks off North Atlantic to not really do it, therefore South Europe was often mild at times this winter.
final addition: There were quite a several occasions when Cold NW and a few Northerly flows via NW Europe brought significant snow sometimes for West South Central Europe quite widespread at times
and brief NE Flows in Central W and mid South Europe.
Edited by user
28 February 2015 01:10:00
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Reason: Not specified
Climate is warming up, Scotland and N Ireland and North England still often gets some Winter frost, ice and snow, November to March, but the SE and South UK including S Central England and Wales, together with the West and North through the year, they sometimes get more rain than London and S SE England, where some longer dry fine spells without much heavy rain is seen every year.
The North Atlantic Sea often gets some much Colder Wintry conditions from November to March Months, and Mild SW and South winds tend to be more frequent over the East and SE of North Atlantic Sea, as the Azores High tends to stay in charge.
With this warmth and heat, the Central and South UK has become mostly free of snow and frost.