America is bracing for a brutal Arctic blast as a massive polar vortex smashes the country bringing deep freeze and catastrophic winter storms. Meteorologists are warning this will be the most punishing Arctic invasion yet, cementing this period as one of relentless, record-breaking cold. Frigid forces in the Arctic are converging, pushing what should be confined to the North Pole deep into the US, several meteorologists tell The Associated Press. This will be the 10th time this winter the polar vortex - which keeps the coldest air at the top of the world - stretches like a rubber band to...