Normally the case I agree, though I recall the great dumping we got in November 2010 happened with a front which moved North-South over Scotland. Remember it well, got into work at 8.30 not a drop of snow and by mid-day the snow was quite deep. This pic was on the journey home from Ravenscraig to Motherwell (via Bellshill) and took about 6 hours! Only had 3-4 hours snow but was utter chaos.