In reply to BnB:
MWIS say "Planning Outlook for all mountain areas from Tuesday, 19th November, 2013
Very cold on Tuesday and Wednesday with frequent snow and hail showers. Also more persistent snow (rain lower levels) early Wednesday. Drifting snow at times in northwesterly gales. General trend later in the week towards quieter, drier conditions with high pressure moving in from the west. Slowly becoming milder though with night frosts where clear. Continued threat of further bursts of cold air coming down from the north".
Of course, the word "threat" in the last line should be read as "promise".