The sky has turned dark and the sun a deep red-orange because of Storm Ophelia.
All over England, the sky looked as if it was in the middle of a sandstorm. The sky was a deep brown and orange, and the sun turned red – or disappeared behind the swirls of sand in the sky.
If it resembled something you’d expect to see in the Sahara Desert, that’s because it was. The sand and dust had been carried over from southern Europe and Africa by recent bizarre weather, and as it swirled around it turned the sky dark.
As the sun moves through the dust, the light is reflected and refracted, meaning that even the light that was falling on the ground appeared to turn the colour of dirt.
The material is swirling high up in the atmosphere, meaning that it is safe to go outside and to breathe, and that the orange effect will pass fairly quickly.
The unusual occurrence was seen in the South-west during the middle of Monday morning before spreading across the country in the afternoon.
Met Office forecaster Grahame Madge said the former hurricane is pulling air and dust up from southern Europe and Africa.
— The Telegraph (@Telegraph) 16 octobre 2017
Red sky at day: why is it happening?
Mr Madge told The Independent that the change in the sky was due to dust particles from the continent, being pulled up through a “vigorous and powerful system” connected to Storm Ophelia.
It’s drawing air from the south that contains dust from the Sahara and is picking up smoke particles from the wildfires in Portugal and Spain. These particles are helping to scatter the sunlight. So, just as we get at sunset, the particles in the atmosphere are scattering and diffusing the bluer wavelengths of sunlight, which is leaving more of the red light to come through.
As Storm Ophelia moves across Scotland on Tuesday and over the North Sea to Scandinavia, it will allow conditions in the south of Britain to improve dramatically. Moreover, the wind coming in from the Atlantic would not contain the same amount of dust.
The UK encounters this phenomenon with Saharan dust about once or twice a year. The addition of smoke particles from the wildfires may have added to the effect this time however, and people could wake up with a layer of dust on their cars in the morning.