The best way to find out is to look at the weather forecast charts (in the charts and data menu) at http://www.netweather.tv/index.cgi?action=nwdc;sess= and select ‘HGT 500-1000’ from the ‘select chart type’ menu If the 528dam line is South of where you are, and there is a forecast of precipitation, then that precipitation is likely to be snow.
What is the 528dam line?
528dam = 5280m
It is the vertical distance between the 1000mb height (somewhere near the ground) and the 500mb height (somewhere in the middle of the troposphere). As warm air is less dense than cold air, the smaller this distance, the colder the air is.
It is also worth having a look at a cross section through the atmosphere for example at http://www.wetter3.de/ – select ‘Vertikalschnitte’ which gives a longtitude/ height cross section for 50N (move the pointer on the right side of the left hand map to change the latitude of the cross section). The air between the clouds and the ground has to be cold for snow to reach the ground.
When do we get snow in the UK?
And an article from the BBC about what constitutes a white Christmas.
Snow inspired science teaching ideas from Science in School.
When will it snow – an article from Met Matters
Snow inspired geography teaching ideas from the GA.
How to make a snowflake, from the Institute of Physics
From Brilliant Maps; the probability of a white Christmas across Europe.