MEMPHIS, Tenn. (AP) — Warnings have been issued across most of the U.S. as brutal cold weather continues to reach southward. Bitterly frigid air spilled into the Midwest from Canada on Friday and several states were under advisories as forecasters warned of wind chills down to minus 30 degrees through Sunday morning. The National Weather Service predicts temperatures could drop as low as 15 degrees below zero in portions of Arkansas, Mississippi, Missouri, Tennessee, Kentucky and Kansas. The frigid weekend weather follows two weeks of storms blamed for at least 61 deaths around the country. So many pipes burst in Memphis that 400,000 people were told to boil their water. (Photo: AP)