Excerpt from the History channel:
So much static electricity built up between the ground and airborne dust that blue flames leaped from barbed wire fences and well-wishers shaking hands could generate a spark so powerful it could knock them to the ground. Since static electricity could short out engines and car radios, motorists driving through dust storms dragged chains from behind their automobiles to ground their cars.
I agree, I actually thought no particular reason was given.
I do like the new guy though, he did great in the finale of season 2.