How could winds possibly uproot huge trees?

The initiation of the falling of the trees is due the impact of strong winds on the tree and flow separation and turbulence formation due high speed flow around a tree(generally cylindrical nature). read more

Trees have thick trunks and dense foliage that stand up against the force of high winds unlike grass and smaller plants and shrubs that are flexible and bend with the wind. This creates a huge force against the tree thereby uprooting it. read more

According to NOAA's new Enhanced F Scale, softwood trees uproot in winds ranging from 73 to 112 mph, which translates to an F-0 to F-1 storm. Higher winds in the F-3 and above categories tend to snap trunks or strip the bark off the entire tree. read more