I've drawn fronts on the GFS image for tonight which was much harder than usual. Quite a complex area of low pressure. An area of deep instability is projected to move up from the English channel tonight to affect central southern and south western parts of the UK (inc Wales). With slackening winds and a cooling night-time boundary layer the conditions should just be about cold enough for the precipitation to turn to snow even to low levels in the aforementioned areas with snow over higher ground in other parts. 

Although the conditions are very marginal, the precipitation could be very heavy giving the possibility of extremely localised but, nonetheless, not trivial temporary accumulations. 

Reports of sleetiness in southern England in the last hour or so. AROME going for a wintry mix for part of the south tonight and Wales.

Sleet has been reported in parts of Surrey over the last few hours. Our radar shows up that some maybe falling in the hills elsewhere too ...
Matt pic.twitter.com/VJln5nPLCy

— BBC Weather (@bbcweather) November 20, 2018

I was completely surprised stepping out of work at the drop in temperature- before 5pm the temperature was about 2°C, the wind, though light, felt cold (dry?) but the roads were wet. There's stuff falling out of the sky and I'm off out with my power torch to ...er...enhance its whiteness for personal satisfaction.

Reports of snow at Vernham Dean and Amesbury, with a rain-snow mix in Andover.

Sherborne St John (just N of Basingstoke) now reporting snow.

Doesn't feel cold enough for snow to be honest... To warm even for sleet.

Flakes of snow coming down in the rain here in Croydon.

A few photos of the Snake Pass on the NorthYorkshireWeatherUpdates page

https://www.facebook.com/NorthYorkshireWeatherUpdates/

https://www.metcheck.com/WEATHER/precipitype.asp#

What a poetic image that is 

Silly season has started; I don’t know why I’m getting excited to see a flake of snow; when it won’t even settle lol 😂

Really vindicates the idea that wind is often far more important than temperature when it comes to snow probabilities.

The precip is turning wintry where the wind is dropping. 

Looking at the radar, the Pennines will definitely be copping it over the next hour or so.

Northern England really has had a lot of precipitation from this easterly - we’d have had a lot of snow if the air was properly cold. 

The North Sea convection machine is working either way. 🙂 Good to see the setup in full swing so early in the season. 

Its partly because its so early in the year. Warm SSTs really help convection. Its why 2010 was so memorable, I'm a bit worried we will have to wait until February to see proper cold; by then the convection machine is nearly dead. I mean Imagine if the 'beast' last year happened in December.

Seems to have been an upgrade of an event conpared to what was on offer in the charts earloer in the week..... as weak as it is...

Saying that i wonder if we will see some surprise snowfalls to greet some of us tomorrow at dawn... 

Facebook will be interesting tomorrow...

Great start to winter....

Lamppost watch confirms sleet here, too; the odd large, splodgy flake in the rain.

The temperature fell from 2.6C to 2.3C in the first ten minutes of rain, but it's now fallen more rapidly to 1.7C.

So, no matter what happens this coming winter, this year's already slotted ahead of years such as 1997/8 and 1998/9 in terms of snow!