Page 2 - Winter Mode News Today

>> this time of year we often see these hurnlg temperature swings driven by a jet stream moving from the winter mode to the summer mode. the battle between the warm and the cold is whats helping to fuel these severe storms. >> reporter: forecasters wash the danger is not over yet. a strong front is expected to move across the next section of the country over the next couple days, bringing potential for dangerous weather to about 40 million people across 20 states. francis coe, nbc news. the go...