Weather Change Coming?

I saw 2 really big dust devils today.  They always look cool in the fall with corn leaves twirling around.  Often dust devils area precursor to a change of weather, but other than rain in the forecast Sunday and Monday, I am not sure what change we might get.  Could this signify Isaac affecting Midwest weather?  Maybe for the good?

On another note I was sampling harvested corn this afternoon.   Soil was not as moist as stubble beans sampled earlier this week, so the rain must have done some good to the corn.  I am not sure if it is dry enough to affect potassium or not.  Luckily we have past years data to judge from too.