That's a similar scenario to the one which often crops up at this time of year in which you will be reporting snow in the south of Edinburgh, only for me to be reporting just rain here in NW Edinburgh.

You have just shown here that it's not just here in Edinburgh that this sort of thing happens.

Yes they did extremely well again. 

There's a covering of snow here now. 

https://www.theweatheroutlook.com/twocommunity/Posts/t24157-Snow-reports 

There might be a little sting in the tail of this system yet as it exits ESE and what looks like a secondary wave forming behind it.

The system on Saturday is showing as bringing a period of very heavy snow for the more northern Pennines and Lake District. 

Hopefully the system will clear through by Sunday

I get lot of information and updates from Midlands thread in NW and likely a better snow chance here from Cheshire gap overnight Thursday to Friday am which gave average 8cm snow depth from previous gap and wash showers streamers.  Cheshire gap showers are far much better than crap light blue radar that was the most of the time here.  This time more settled with frozen ground.

1) Convergence. If we have low level convergence then showers will penetrate well inland. Orographic features and wind direction matters here. Note that the wind follows the isobars out at sea and bends towards LP inland. You can use this rule of thumb to work out roughly where convergence where happen. If the wind bashes into itself it is forced to rise.

2) Shear. You want directional shear to be low. Look at upper level e.g. 500hpa or 700hpa charts and compare to MSLP. If the contours are roughly aligned then showers will penetrate further inland.

3) Wind speed. Roughly speaking more wind = more penetration. Make sure you take sea breezes into account. At this time of year the land is colder than the sea so air blows out towards the sea, especially at night. What this tends to do is reduce penetration a night but also increase intensity towards the coast. 

4) Land friction. Similar to above, but note that wind being forced over mountains slows it down and causes intensity of showers to grow at the expense of penetration. Curiously for some inland areas you actually want a smaller instability/CAPE such that the moisture survives longer inland before it starts to snow out. If instability is very high (look to see if its already heavily snowing out to see) then intensity will be very high at the coast but penetration will be low. The ideal scenario for inland areas is *conditional instability*, i.e a thin layer of stability somewhere that is not immediately overcome but is gradually destroyed allowing greater penetration.

Already had some snow on the higher parts of the Moor Neil, I am thinking there could be a fair few cms end of play Thursday.

We were just below the snow line earlier today.

I think "sleet" would have to be inferred from GFS data because it doesn't exist as a variable. GFS / GEFS are (are as I am aware) somewhat unusual in having "categorical" variables for precipitation type. Therefore, they provide precipitation rate and precipitation types separately.

UK Met and Meteo France models instead combine precipitation types and rate, e.g surface Rain Precipitation Rate [kg/m^2/s], surface Snow Precipitation Rate [kg/m^2/s], surface Graupel (Snow Pellets) Precipitation Rate [kg/m^2/s].

Watching TV weather in USA I think this is usually labelled as "Mix"

Quite possibly, but it would still need to be inferred as there isn't a "Mix" variable either.

Yeh so you could do sleet, as I say my recommendation would be to create a bin where if the proportion of total precip in both rain and snow is greater than 0.3 but less than 0.7 then you show it as a different hue.

There's also a disturbance heading SE across Wales right now, which some models show making it almost all the way to the south coast as snow.

We're out on Sunday (Chatsworth) and although I'm relieved we'd not planned this for Saturday, the forecast temp (Met Office) for Sunday there has, over the past few days, risen almost each update, from 4c to 11c. There's also still the danger of a trailing front dragging its feet behind the main system.

https://www.metoffice.gov.uk/weather/warnings-and-advice/uk-warnings#?id=0608d234-6114-462c-b006-5e04bcdf3886&date=2024-11-21 

Have a well timed day off on Friday to get out on the higher parts of the Moor before it is washed away on Saturday. 

There's an orange warning for parts of Southern Ireland for snow tonight with a more widespread yellow warning. I am sceptical as to whether I will see any snow at my location but there is certainly a risk of significant falls further inland or with a little bit of elevation.