January 6, 2014 6:14 am Deep Freeze Grips Much of US Temperatures could plummet to record lows across much of the US, as a “polar vortex” brings extremely cold air and powerful winds to much of the US. Wind Chill Warnings are in effect from Montana to Alabama. US & World Videos 0:48 Target to lower prices on about 5,000 basic goods 0:47 WATCH: Comet fragment lights up the sky in Portugal 1:58 ICC seeking arrest warrants for Israeli and Hamas leaders 1:43 World reacts to death of Iran's president 1:07 Cargo ship that crashed into Baltimore bridge moving back to port