  Nondipole effects in the atomic dynamic interference are investigated by
numerically solving the time-dependent Schr\"odinger equation~(TDSE) of
hydrogen. It is found that the inclusion of nondipole corrections in the TDSE
can induce momentum shifts of photoelectrons in the opposite direction of the
laser propagation. The magnitude of the momentum shift is roughly proportional
to the laser peak intensity and to the momentum component of the photoelectron
along the laser propagation. By including the nondipole corrections of the
Volkov phase into a semi-analytical model previously developed under the dipole
approximation, all the main features of the momentum shifts can be nicely
reproduced. Through an analytic expression, the origin of such momentum shifts
is attributed to the nondipole phase difference between the two electron wave
packets ejected in the rising edge and the falling edge, which will interfere
with each other and result in the final fringe pattern. One important
consequence of such momentum shifts is that they can smooth out the peak
splitting induced by the dynamic interference in the photoelectron energy
spectrum. Nevertheless, it should be emphasized that the dynamic interference
persists in the photoelectron momentum distributions and is not suppressed at
all for the laser parameters considered in this work.
