My guess is that the move south, under the cover of darkness and the sandstorm, was an attempt to reach an engagement with our ground forces in the hopes that once they met us on the ground, we'd be more reluctant to use air support for fear of "friendly fire" incidents. Possibly they were further hoping that the sandstorm would continue another day, further "levelling the playing field."
A desperate move, even if the weather had cooperated; doomed utterly when the weather improved. The fact that they took this gamble speaks volumes.
Troops, well armed and well trained, everywhere.
Jets and helicopters overhead 24/7.
Locals finally able and willing to fight.
Sadistic tyrant be damned - we're outta here!