America is on alert for winter Storm Gerri to smash the nation with the coldest blast in a year to trigger ‘big-time’ snowfall and even a ‘desert’ whiteout. Due to rip through of the weekend, Gerri will be the third in a three-pronged assault and will send temperatures plunging in the wake of killer Storms Ember and Finn. Freezing air surging southwards will crash into warmer air from Mexico driving a polar onslaught that will unleash a freak bout of ‘desert snow’. The US National Weather Service (NOAA) has a raft of warnings across the country as the danger from heavy snow, blizzards and floo…
