The weekend sees an atmospheric battle taking place overhead between tropical and polar air masses. The video below shows the stage being set for this battle: watch the westerly winds pushing against the cold polar North-Easterlies sweeping down from Scandinavia and meeting over… well, Reigate!! Anyhow, this weekend temperatures will fall throughout Saturday from 3°C to freezing by late afternoon. Rain could turn sleety from mid-afternoon onwards as the coldest air pushes in and light snow is possible, dying out early Sunday morning. Sunday looks dry and cold, feeling like -7°C in a chilly northerly wind. Monday is set to be even colder, staying near freezing all day and feeling like -8°C in the wind, but dry (though latest is for snowy front moving south according to UKMO). The rest of the week is unclear but likely to stay cold until at least Wednesday with more significant snow likely Tuesday. Longer term predictions suggest January will stay cool, with a few milder interludes.