tree failure due to uprooting caused by wind.
Merriam-Webster Online Dictionary
windthrow (noun) the uprooting and overthrowing of trees by the wind
windthrow (Wikipedia)
Windthrow in the Bavarian Forest National Park
An old dried out Windthrow. Ystad.
A large-scale event in the Sangre de Cristo Mountains.
Juniperus virginiana var. silicicola windthrown by Hurricane Irma.
In forestry, windthrow or blowdown refers to trees uprooted or broken by wind.
Breakage of the tree bole (trunk) instead of uprooting is sometimes called windsnap.