By the time the water reaches main washes, walls of water several feet deep proceed rapidly downstream. Flash floods typically have a debris-laden front composed of rock, trees, and mud in water that surges down the channel. If channels are filled by the streams, the water spills over the stream banks to form floodplains. Flood was 8 ft deep and covers the road. Rain fell 6 to 8 miles away.
Dust storms can sandblast surfaces, stripping paint and frosting windshields.
They.are caused by powerful winds and can carry fine materials away from one place and deposit them in another. Windblown materials are mostly silt and fine sand. Prolonged rain in the desert can create many new sand deposits after floods receed. These sand deposits are unstable becuase no plants grow on them yet. After they sand dries it can be blown by strong winds to form dunes that can migrate across roads and into houses.