  (Shortened) Sequences of spectra of the nova-like cataclysmic variable (CV)
BZ Cam were acquired on 9 nights in 2005-2006 in order to study the time
development of episodes of wind activity known to occur frequently in this
star. We confirm past results that the P-Cygni absorption components of the
lines mostly evolve from a higher expansion velocity to lower velocity as an
episode progresses. We also commonly find blueshifted emission components in
the Halpha line profile, whose velocities and durations strongly suggest that
they are also due to the wind. We suggest that the progression from larger to
smaller expansion velocities is due the higher velocity portions of a wind
concentration moving beyond the edge of the continuum light of the disk first,
leaving a net redward shift of the remaining absorption profile. We also derive
a new orbital ephemeris for BZ Cam, using the radial velocity of the core of
the HeI 5876AA line, finding P = 0.15353(4). Using this period the wind
episodes in BZ Cam are found to be concentrated near inferior conjuction of the
emission line source. This result confirms that the winds in nova-like CVs are
often phase dependent, in spite of the puzzling implication that such winds
lack axisymmetry. We argue that the radiation-driven wind in BZ Cam receives an
initial boost by acting on gas that has been lifted above the disk by the
interaction of the accretion stream with the disk, thereby imposing flickering
time scales onto the wind events, as well as leading to an orbital modulation
of the wind due to the non-axisymmetric nature of the stream/disk interaction.
