[b]This weekend's outlook, starting from Wednesday 26 November[/b]

We can forget about long term effects over this short time period. Our eyes are turned to the 3 main models at what is now T+72 on Saturday. Indeed we need to start looking from tomorrow when the first hint of the colder air returning will be seen.
The Met O Fax chart for T+36, (currently at 1630), shows it nicely. The cold front moving fairly quickly through most of the UK by dusk or soon after for the far southeast.
[attachment=71632:weekend_1.JPG]
Behind it the coldest air seems set to be for the western half of the UK for quite a little while. So for those snow addicts its looking like Ireland and Scotland along with possibly for a time Wales may see some. Really its only for the hills as we go towards the weekend, perhaps as low as 3000 metres (about 1,000ft) before we have a drier spell developing through Friday after wintry showers for western parts. Friday morning is likely to dawn bright and frosty for a good many it would seem.
See the Extra chart for minimum temperature below
[attachment=71633:weekend_2.JPG]

I'll use NE Extra charts to try and illustrate what, as of the 12z run today, is likely to happen from late on tomorrow into the weekend. Leaving out beyond that for now.

So for the weekend
Again looking at the Met O Fax forecast for 12z Sunday is likely to give a reasonable picture of probable events
[attachment=71634:weekend_3.JPG]
Obviously details will change but the overall idea of a cold north or north west flow, complicated by two features is there to see.
Feature one is the low shown in the Channel area, this may be north/south/east or west of this position by perhaps 50-70 miles, making a lot of difference so its something each update will address and for the same time (12z Sunday)
The second feature is the low in the Iceland region. This will also change in track and probably intensity as well so another feature to keep tabs on.

So there we have a quick situation check. A cold and probably rather wet weekend seems in prospect for many but with twists and turns to come as we count down.
The rainfall charts for Saturday and Sunday at 12z from Extra are shown below
Saturday on the left and Sunday on the right

[attachment=71635:weekend_4.JPG][attachment=71636:weekend_5.JPG]

And below their respective 850 mb temperature charts
[attachment=71637:weekend_6.JPG][attachment=71638:weekend_7.JPG]

Below is the self help will it snow for me link; remember about your height above sea level and the AVERAGE temperature drop being about 3C per 1,000ft (300 metres). One other point to bear in mind, for the winter as a whole, where moderate to heavy rain falls for 2 hours or more, it CAN if other things are in its favour turn the rain to snow. A reasonable guide to this is the wet bulb temperature. If its3C or below is a good guide.
The link
[url="http://www.netweather.tv/forum/index.php?showtopic=27989"]http://www.netweather.tv/forum/index.php?showtopic=27989[/url]

excuse any errors bit of a rush