A 700-mile ‘cold pool’ left in the wake of a ruthless winter cyclone threatens to unleash a crippling ‘ice storm’ across parts of the US. Holidaymakers returning home after Christmas are warned travel in the worst-hit regions will be difficult to ‘near impossible’. A huge storm battering America is continuing its frenzied journey since the start of the week from the west coast to eastern states. The National Weather Service (NOAA) has numerous severe weather alerts in force for the run-up to New Year. In the firing line for the worst of the mid-week onslaught will be Kansas, Nebraska, North an…