  We investigate beam pointing dynamics in filamentation in gases driven by
high repetition rate femtosecond laser pulses. Upon suddenly exposing a gas to
a kilohertz train of filamenting pulses, the filament is steered from its
original direction to a new stable direction whose equilibrium is determined by
a balance among buoyant, viscous, and diffusive processes in the gas. Results
are shown for Xe and air, but are broadly applicable to all configurations
employing high repetition rate femtosecond laser propagation in gases.
