From a deep blue this weekend, the sky turned yellowish white on Monday. In question, a new episode of Saharan dust from Algeria. The episode should not be as marked as it was two weeks ago.
The sky is much less ocher than two weeks ago, but this hazy veil, which draws on yellow, does not deceive. The air laden with sand dust from the Sahara is back over French-speaking Switzerland. The episode is visually less impressive than 15 days ago when the phenomenon was particularly strong. But this time again the weather conditions are met, details Olivier Duding, meteorologist at meteosuisse: “A depression has widened over Algeria. This raised sand a day or two ago and now it is being transported towards the Alps. . ”
10 to 35 times a year
This phenomenon is not uncommon in our skies. 10 to 35 sand incursions from North Africa are observed on average each year by Meteoswiss.
The most favorable periods: autumn and especially spring when the south wind blows more frequently. At the start of the week, the episode is moderately marked, but according to this forecast model, the sand concentrations should be maximum in the coming hours.
This time the sand should remain suspended for lack of precipitation. Best times to observe the ocher colors brought from the Sahara, the sunset and the dawn tomorrow which could rival that of this morning.