Eh ... thundersnow ?
seems like a contradiction in terms. But it can - and does - happen!
Below ... are three short, interactive video clips in which BBC meteorologists explain WHY this, and a couple of other unusual phenomena - namely, "weather bombs" & "temperature inversions" sometimes occur, and how such conditions may account for the "freak" climatic features a number of 's coastal areas are currently having.
www.bbc.co.uk/weather/features/31446323