 By August, the lake bed is dry and rough from the weather and from high performance aircraft performing landings.Both lake beds are some of the lowest points in the Antelope Valley and they can collect large amounts of precipitation.Desert winds whip this seasonal water around on the lake beds and the process polishes them, yielding a new, extremely flat surface; the Rosamond lake bed was measured to have an altitude deviation of over a length; that's about altitude deviation over every of length.