  We suggest a mechanism for the emergence of a superradiance burst in a
subwavelength array of nonlinear classical emitters. We assume that the
emitters interact via their common field of radiative response and that they
may have an arbitrary distribution of initially phases. We show that only if
this distribution is not uniform, a non-zero field of radiative response arises
leading to a superradiance burst. Although this field cannot synchronize the
emitters, it forces fast oscillations of a classical nonlinear emitter to have
long-period envelopes. Constructive interference in the envelopes creates a
large dipole moment of the array which results in a superradiance pulse. The
intensity of the superradiance is proportional to the squared number of the
emitters, which envelopes participate in the fluctuation.
