Will Hand wrote:
"Darren Prescott" wrote in message
...
I've seen omega blocks before, but the MetO output tonight is rather odd...

http://217.160.75.104/pics/Rukm1441.gif

That looks like an upper omega block over the UK, I assume that'd keep the
cold over us for a while. However, just to the west looks for all the world
like a *surface* level omega block - two blocks, side by side...

I've not seen that before.



Darren, I think the western limb is only temporary, a surge of low potential
vorticity (warm air) which will help to maintain the omega block in the UK
longitude. Incidentally ECMWF 12Z from www.ecmwf.int is consistent with its 00Z
predecessor maintaining the block more or less over the UK and then
retrogressing slightly at the new T+168 stage. If that trend is continued then
we could be facing a cyclonic northeasterly in the extended outlook which would
be fun! GFS consistent with UKMO. All going to plan so far.

Will.
--

" Ah yet another day to enjoy "
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Your crystal balls give out more information than mine ;-)

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Keith (Southend)
http://www.southendweather.net