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WEATHER

Saharan dust smothers Switzerland and southeast France

An exceptionally rare haze of Saharan dust cloaked Switzerland and southeastern France on Saturday, sparking health warnings as a yellow hue tinged the sky.

Published: 30 March 2024 16:32 CET
This RGB Dust Composition satellite image from 29th March, 2024 shows the Saharan dust in pink. Its trajectory towards Europe is clearly visible despite the many clouds.
This RGB Dust Composition satellite image from 29th March, 2024 shows the Saharan dust in pink. Its trajectory towards Europe is clearly visible despite the many clouds. Photo: MeteoSuisse and Eumetsat 

The phenomenon, which began in Switzerland on Friday, brings with it “a very clear worsening of sunlight and visibility. Added to that is an increase in concentrations of fine particles”, the MeteoSuisse weather service posted on X.

With the dust concentrated at lower than 3,000 metres (around 9,800 feet), air quality was especially affected, with Switzerland’s airCHeck monitoring application flagging high levels of pollution in a corridor stretching from the southwest to the northeast.

Calculations estimate that the amount of dust reached around 180,000 tonnes, double the levels recorded during recent similar events, SRF Meteo forecaster Roman Brogli told public radio.

In neighbouring France, local authorities in the southeast and south announced that the air pollution threshold was breached on Saturday, with the Herault department asking residents to avoid intense physical effort, particularly those with heart or respiratory problems.

The Sahara desert releases 60 to 200 million tonnes of mineral dust per year. While the largest particles come rapidly back down to earth, the
smallest can travel thousands of kilometres.

The sand gives an orange tint to snow and can impact melting processes, notably for glaciers, which are shrinking as average temperatures rise, by reducing the ice’s ability to reflect sunlight.

The situation is due to improve in France and Switzerland on Sunday.

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WEATHER

Will Switzerland be visited by ‘Ice Saints’ this year?

Ascension is not the only annual happening in the country in May, as Switzerland also ‘celebrates’ another 'chilling' event this month.

Published: 8 May 2024 14:20 CEST
Will Switzerland be visited by 'Ice Saints' this year?

From May 11th to the 15th, a meteorological event takes place each year in Switzerland.

It “observes”, though admittedly not on scientific basis, a centuries-old weather phenomenon called “Ice Saints”.

What exactly is it?

As its name suggests, it is related to saints, as well as ice and frost.

The saints in question are St Mamertus, St Pancras, St Servatius and St Boniface.

According to a weather lore, once these Ice Saints have passed through Switzerland in the middle of May, frost will no longer pose a threat to farmers and their land.

As the official government meteorological service MeteoSwiss explains it, “spring frosts have been a regular occurrence for centuries, giving rise to the traditional belief that a blast of cold air often arrives in the middle of May. Over time, this piece of weather lore became known as the Ice Saints.”

Fact versus myth

You may be wondering whether the Ice Saints lore actually has basis in reality.

Records, which date back to 1965 and originate from the Geneva-Cointrin, Payerne, and Zurich-Kloten weather stations, “clearly show that, over the long-term average, frost directly above the soil is only a regular occurrence up until the middle of April”, MeteoSwiss says. “After that, the frequency with which ground frost occurs progressively declines to almost zero by the end of May.”

“We can conclude, therefore, that there is no evidence in Switzerland to confirm the Ice Saints as a period in May when ground frost is more common.”

However, MeteoSwiss does concede that “ground frost is nevertheless a regular occurrence throughout May as a whole…having occurred at least once or twice in May every year, and in around 40 percent of the years there were more than two days in May with ground frost.”

What about this year?

MeteoSwiss weather forecast for the next seven days indicates that, this year too, no frost will be present on the ground in mid-May.

In fact, temperatures through much of Switzerland will be in double digits, reaching between 18C and 25C, depending on the region.

You can see what to expect in your area, here. 

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