Zonda wind

The Zonda is a dry wind (often carrying dust) which comes from the polar maritime air, warmed by descent from the crest, which is approximately 6,000 m (20,000 ft) above sea level.

The Zonda wind is produced by the northeastward movement of polar fronts, and although it is hot and dry at the low-lands, it is the main mechanism for snow precipitation at the high altitude chains, where it looks as viento blanco, reaching speeds sometimes over 200 km/h.

Thus, instead of being a snow-eater, this wind is particularly important for this arid region, as it is connected to the buildup of the winter snow cover and accumulation over the scarce local glaciers.

According to studies (conducted over the period 1967–1976), the Zonda wind most commonly starts during the afternoon (between 12 and 6 PM), and tends to last between 1 and 12 hours, though it may present itself intermittently for as long as 2 or 3 days.

The term zonda also describes a hot, humid north wind in the Pampas, in advance of a depression moving eastwards, and preceding the pampero.