Recovery efforts are underway in parts of the southern United States after at least 22 people were killed by tornadoes over the weekend. Mississippi was the hardest hit, with 21 killed and over 2,000 homes damaged or destroyed. One person died in nearby Alabama. Georgia also experienced severe storms with reports of over 100 damaged homes and businesses. President Joe Biden declared an emergency for four Mississippi counties, making federal funds available for recovery efforts. The affected areas are some of the poorest in the state, with local authorities praising the resilience of their communities. However, the storms are not yet over, with more severe weather expected later in the week, particularly in the central states. Friday was the first time the US had seen an EF4 tornado since November. Supercell storms, such as the one responsible for the Mississippi tornado, are among the most destructive and can sustain themselves for longer periods than most tornadoes.