Extreme Cold Alert: What is a Polar vortex, and why is it dangerous? Will it affect India?
Americans are preparing for dangerously cold temperatures on Thursday, with forecasts predicting life-threatening conditions and the coldest inauguration day in 40 years. The Arctic “polar vortex” is expected to bring nighttime lows as low as minus 23 degrees Fahrenheit (minus 31 degrees Celsius) to some of the northernmost parts of the United States over the