High wind storms result in the loss of roofs from buildings

High wind storms result in the loss of roofs from buildings. What size lift force(s) is/are involved? How is/are the force(s) being generated? What size wind is needed? What variables would affect the result?

Solution

head loss=[FlV^2]/2(rho)g=[deltaP]/2g

where F=friction factor V=velocity L=length over which fluid is flowing

with increase in velocity, pressure decreases.

as velocity of air over the roof increases while velocity of air below the roof which is the inside condition of room stays the same. so there is a pressure difference created as lower pressure on outer side and higher pressure being inside. This is the reason High wind storms result in the loss of roofs from buildings.