A series of tremendous tornadoes

More than 600 tornadoes have swept across the United States in April, killing over 350 people and destroying over 10 000 buildings. The deadliest incident took place on April 27 and 28.
In 24 hours, 312 tornadoes had lashed seven states and killed 340 people. According to the company Eqecat, specialized in risk modeling, this series of tornadoes is likely to have caused two to five billion dollars of damages.