  Blue-shifted Broad Absorption Lines (BALs) detected in quasar's spectra are
indicative of AGN outflows. We show, using 2D hydrodynamical simulations, that
disruption of interstellar clouds by a fast AGN wind can lead to formation of
cold, dense high speed blobs that give rise to broad absorption features in the
transmission spectrum of the AGN continuum source. For a wind velocity of $0.1
c$ and sufficiently high cloud density ($n_{c}$ < $10^4$ cm$^{-3}$, depending
on size), absorption troughs with velocities up to about $3000$ km s$^{-1}$ can
be produced. For slower winds and/or lower cloud density the anticipated
velocity of the absorbing clouds should be smaller.
