LS, with such low uppers, in the region of -10 to -12, why would the showers that sweep the NE coast fall mainly as sleet? As you mentioned in your summary, the charts look very similar to the 23rd December, it was this event that gave us the snow that is still on the ground here! I can only presume that the wind direction will be having a major influence on the temps at the coast, however, does it not have a cold origin?