Sirocco

Sirocco (/sɪˈrɒkoʊ/), scirocco, jugo or, rarely, siroc (see other Names below) is a Mediterranean wind that comes from the Sahara and can reach hurricane speeds in North Africa and Southern Europe, especially during the summer season.

Sirocco wind diagram by Piotr Flatau
This article is about the Mediterranean wind. For other uses, see Sirocco (disambiguation) and Jugo (disambiguation).
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Names

Sirocco is derived from the Arabic word sharqiya (شرقيه) which means easterly. This wind has different names in different languages, including:

  • Italian: scirocco
  • Sicilian: sciroccu
  • Spanish: siroco
  • Catalan: Xaloc
  • Maltese: xlokk
  • Occitan: siròc, eisseròc
  • Greek: Σορόκος (Sorokos)
  • Albanian: shirok
  • Croatian: jugo
  • Ligurian: sciòccu or mainassu
  • in Libyan Arabic: ghibli (قبلي) which means "coming from Qibla"
  • in Egypt: khamsin (خمسين) which means "fifty" ("fifty-day wind")
  • in Tunisia: chluq (شْلُوقْ) (probably from shuruq شروق with the same meaning as sharqiya) or شْهِيلِي ch'hili
  • in Morocco: chergui (شركي) (from sharq east)

Development

It arises from a warm, dry, tropical airmass that is pulled northward by low-pressure cells moving eastward across the Mediterranean Sea, with the wind originating in the Arabian or Sahara deserts.[1] The hotter, drier continental air mixes with the cooler, wetter air of the maritime cyclone, and the counter-clockwise circulation of the low propels the mixed air across the southern coasts of Europe.

Effects

The sirocco causes dusty dry conditions along the northern coast of Africa, storms in the Mediterranean Sea, and cool wet weather in Europe. The sirocco's duration may be as short as half a day or may last several days. While passing over the Mediterranean Sea, the sirocco picks up moisture; this results in rainfall in the southern part of Italy, known locally as "blood rain" due to the red sand mixed with the falling rain.

Sirocco is commonly perceived as causing unease and an irritable mood in people.[2] In addition, many people attribute health problems to the wind, either because of the heat and dust brought from African coastal regions, or because of the cool dampness further north in Europe. The dust within the sirocco winds can cause abrasion in mechanical devices and penetrate buildings.

Sirocco winds with speeds of up to 100 km/h (62 mph; 54 kn) are most common during autumn and spring. They reach a peak in March and in November when it is very hot.

When combined with a rising tide, the sirocco can cause the acqua alta phenomenon in the Venetian Lagoon.

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References
  1. Golden Gate Weather Services. Names of Winds. Retrieved on 2006-12-28.
  2. "Južina značenje, definicija i primjeri". Jezikoslovac (in Croatian). Retrieved 13 July 2020.
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