US weather service issues highest tornado warnings in two years

More than two million people in Oklahoma and the Texas Panhandle are in harms way after the National Weather Service's Storm Prevention Centre announced a threat level-five warning - their highest - for violent tornadoes as well as warnings for significant hail and flooding lasting into Monday night.They've also designated the storm a 'Particularly Dangerous Situation' or PDS, their most dire classification. This is the first time in two years that the National Weather Service has issued such hi