A plume of Saharan dust moving north across Europe could bring the rare weather phenomenon known as “blood rain” to parts of the United Kingdom in the coming days, forecasters say.

Meteorologists report that strong winds over North Africa have lifted large quantities of desert dust high into the atmosphere, allowing the particles to travel thousands of kilometres toward western Europe.

As the dust plume drifts over Britain, it is expected to mix with incoming rain systems, potentially producing rainfall tinted with reddish or brownish sediment.

The effect occurs when fine mineral particles from the Sahara are carried long distances in the upper atmosphere before being washed out by precipitation.

When raindrops collect the dust as they fall, they can leave a faint reddish coating on surfaces such as cars, buildings and pavements, creating the appearance commonly referred to as “blood rain.”

Weather specialists say the phenomenon is not unusual during periods of southerly airflow that transport warm air masses and desert dust from North Africa into Europe.

Similar events have previously been observed in the United Kingdom and across the continent during spring and summer weather patterns.

Forecast models indicate that the dust plume could reach parts of southern Britain as weather systems move in from the Atlantic.

If rainfall coincides with the arrival of the dust, visible deposits may be left behind after showers pass through affected areas.

Experts stress that the phenomenon poses no health risk to most people, although the fine dust can occasionally contribute to hazy skies and slightly reduced air quality during its passage.

Authorities sometimes advise individuals with respiratory conditions to monitor local air quality forecasts when dust concentrations increase.

In addition to the coloured rainfall, the dust plume may also produce vivid sunsets and sunrises as the particles scatter sunlight in the atmosphere.

These visual effects often accompany Saharan dust events as the particles filter and refract light at different wavelengths.

Forecasters say the extent of any “blood rain” will depend on the exact path of the dust cloud and whether rainfall occurs at the same time the plume passes over the United Kingdom.