What is not clear from the article is if the aircraft were inside or outside and if outside how they were tied down. The article says "The storm hit the area the hardest just after 5pm, which lifted concrete blocks weighing more than 100 kilograms from the ground." I hope that these wernt the tie downs for the aircraft or that the news got it wrong(likely). 100kg is not a lot of weight, FAA AC 20-35C suggests 3000 lbs as the capacity of a fixed tie down at an airport which is about 1400kg.