Abstract
Abstract The present study gives evidence of the occurrence of foehn-like wind on the eastern slopes of the mountains at Southeastern Brazil. A particular case was detected based on observational evidence on 4 July 2015 near the city of Cruzeiro, state of Sao Paulo, on the Serra da Mantiqueira mountains. Results obtained from numerical simulations are consistent with the foehn wind occurrence deducted from the analysis of regional patterns and time series of selected meteorological parameters.
Highlights
According to the definition of foehn wind, it consists on a wind blowing downward along the lee slopes of a mountain
The present study introduces for the first time in literature, the presence of foehn-like winds at subtropical latitudes of South America over a relatively low mountainrange (Serra da Mantiqueira) located on eastern Brazil
The article focuses on a particular case observed on 4 July 2015 that was documented just through photographs
Summary
According to the definition of foehn wind, it consists on a wind blowing downward along the lee slopes of a mountain. When the content of humidity in the air is higher enough, orographic clouds are observed over the mountain These clouds have particular features that are typical of foehn wind (Richner and Hachler, 2013). Another example is given by the foehn cloud composed of altocumulus lenticularis that form above and downstream of the mountain at high levels (Vieira, 2005) Because this type of wind occurs worldwide, both its name and classification criteria are abundant (Mayr et al, 2018). The typical wind is named zonda (because of Zonda valley, where usually blows) (Norte, 1988; Norte, 2015) It consists of a warm and very dry wind that blows on the eastern slopes of the Andes (Norte, 2015). An orographic wind from the east exists and is locally known as puelche or raco (Rutlant and Garreaud, 2004; Montecinos et al, 2017)
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