As you get closer to the storm in person, the wind will continue to increase in speed and force. Dust that had accumulated around that area of the city will turn into dust storms, but there will be no rain, or any other form of precipitation falling from the sky. There will seem to be flashes of electricity building in the clouds, like it is charging before striking with extreme amounts of force each time. It is different from normal weather patterns in that way, but there does not seem to be any kind of source outside of the storm itself.