Outflow boundary a downburst. "Gustnadoes", short-lived vertical circulations near ground level, can be spawned by outflow boundaries. Gust fronts create low-level wind shear which can be hazardous to planes when they takeoff or land. Flying insects are swept along by the prevailing winds. As such, fine line patterns within weather radar imagery, associated with converging winds, are dominated by insect returns. At the surface, clouds of dust can be raised by outflow boundaries. If squall lines form over arid regions, a duststorm known as a haboob can result from the high winds picking up dust in their wake from the desert floor.
Desert whitethroat differences it follows Gloger's rule of pale colour in arid regions. The throat is white, and the rest of the underparts pale greyish-white. Three subspecies are currently recognised, though some authors only accept the first two as distinct. The presumed lesser whitethroat subspecies "halimodendri" and "telengitica" might actually belong to the desert whitethroat, or alternatively might represent hybrid intergrades between, respectively, "S. m. jaxartica" and "S. m. margelanica" and the lesser whitethroat. Desert whitethroat inhabits arid lowland regions from eastern Iran and Turkmenistan eastwards to Xinjiang in central China, breeding in open dry thorn scrub. The breeding range does not