Brit holidaymakers who are spending the festive period in the Canary Islands are being warned of a severe weather phenomenon where visibility can be rapidly reduced. The national weather agency in Spain has advised about the extreme case of "calima" - which sees billions of particles of dust from Saharan Africa fill the air, transforming the sky with a yellow or red haze. And according to meteorologists, the calima will "strongly" impact the Canary Islands, particularly its eastern isles, from