High-speed winds are accompanied by a reduced pressure. So, the air pressure above the roofs of the houses is lower than the pressure below them. If the difference is large and the roofs of the houses are not strong enough, they may be blown away. To keep our roofs safe, we should keep the doors and windows of the houses open during storms with high-speed winds. When the same wind moves over the roofs and through the houses, the pressure difference inside the house and over the roof is reduced considerably, making our roofs safe.