QUESTION: 
Would there be a chance that as dust moves through the atmosphere that
lighting could occur?

ANSWER from the Internet on August 13, 1997:
http://powerweb.lerc.nasa.gov/pv/lightning.html

There is good theoretical reason to expect that electrical discharges will
exist on Mars.  For example, lightning discharges are characteristic of
desert sandstorms on Earth, and of suspended ash in volcanic plumes.  This
potential build-up occurs due to charging associated with particles rubbing
against each other ("triboelectric charging") followed by charge separation
due to differential forces on particles of different sizes.  Similar
conditions, and an even dryer atmosphere, prevail on Mars, and should also
produce charging.

Electrical discharges on Mars, however, may be very different in character
due to the low pressure of the Martian atmosphere.  In particular, the
pressure is well suited for Paschen discharges, and the gas mixture is
expected to have a breakdown potential minimum as low as 100 V (compared to
roughly 400 V for pure carbon dioxide).  Thus, electrical discharges may
occur in the form of a glow discharge (similar to the discharge inside a
fluorescent bulb), as well filamentous, or arc, discharge, similar to
terrestrial lightning.