The eastern United States and Canada shivered under record-breaking low temperatures as Arctic blasts followed a deadly winter storm. In Canada, temperatures approaching minus 50 degrees Celsius were forecast in northern Ontario and Quebec. <br/><br/>Authorities warned Arctic air and dangerously cold wind chills could bring temperatures that feel as low as minus 45 Fahrenheit across much of the eastern two-thirds of the United States. US media report said the deep freeze follows a storm, dubbed a "bomb cyclone" by forecasters, which has been blamed for at least 19 deaths in the United States. <br/><br/>More than 3,420 flights within, into or out of the United States were still delayed yesterday with New York's John F Kennedy airport and South Carolina's Charleston among the most affected. The US National Weather Service warned that below normal temperatures are likely to continue into early next week, forecasting freezing rain from Kansas to Tennessee, and said that ice could complicate road transport. <br/><br/>In eastern Canada, which has suffered through extreme cold for two weeks, there were further flight delays and cancellations at Toronto airport, and some communities along the Quebec coast faced flooding.