A hatch assembly attachable to a roof of a vehicle includes a removable dome attached to a frame including opposed first and second linkage mechanisms and a latch assembly. The frame includes an annular sidewall section defining an aperture and an outwardly extending flange portion peripheral to the annular wall portion and includes a continuous upper peripheral surface. The dome has an outer planar surface covering the aperture and an inner surface including a hinge portion attached to the first linkage assembly. A latch assembly attaches to the inner surface of the dome on a side of the dome that is opposed to the hinge portion. The latch assembly rotatably couples to a lock wedge, which includes a helical locking surface.