get your booster shots. top u.s. officials say all four vaccines are losing their steam against omicron variant and there will be breakthrough covid cases. and a policing expert and sergeant testified in kim potter trial. one thing he said he never had a police officer, accidentally drawing a gun. ♪ >> announcer: live from london, this is "cnn newsroom" with isa soares. welcome, everyone. it is thursday, december 16th, and we begin this hour with breaking news in the united states. now powerful storm system terror in parts of the midwest and great plains 80 million people under wind alert. right now more than 400,000 customers across eight states as you can see on your map, are without power. there were more than 55 reports of hurricane-force winds across the central u.s. on wednesday,