Tuesday, 23 October 2012

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(The Telegraph)- The weirdest weather on record continues this week – a 20C Indian summer is set to be followed by snow with 'blood rain' thrown in for good measure, the Met office says.

The weather system could bring 'blood rain' - rain carrying red dust from the Sahara which is capable of staining cars Photo: AP/Ian Jones

Temperatures are set to soar this week to an unseasonably warm 20C – but the Indian summer is not set to last as snow as predicted for the end of the week.

A wave of hot air from North Africa is set to sweep through the United Kingdom from tomorrow bringing sunny spells and temperatures in the high teens across the UK.

It could also bring 'blood rain' – rain carrying red dust from the Sahara which is capable of staining cars.

And freezing arctic winds are set to send temperatures plummeting at the end of the week, with snow forecast in the north of England and Scotland by next weekend.

The Met Weather Office said London and the south east will enjoy the hottest weather with temperatures soaring to a very warm 20 degrees centigrade on Monday and Tuesday, provided cloud lifts.

The rest of England and Wales will also enjoy the warm spell with temperatures hovering in the mid teens, although forecaster say it will stay cloudy.

The Met Office also said that red dust kicked up in storms in the Sahara desert and blown over could affect parts of the south east of England during the week.

The dust, which has been blown to the UK as part of the band of warm air, is expected to leave red stains on cars.

She said: "Where there has been rain in the southeast there has been red dust brought down with it. When the rain dries off it leaves a red residue.

"This could last until the early part of the week."

The Indian summer is set to be short lived, however, as arctic winds blow across Scotland on Friday and England on Saturday.

Temperatures are predicted to sink to around 8C degrees in the Midlands and 6C in Scotland.

Met Office forecaster Emma Sharples said: "People should enjoy the warm weather while it lasts – because it won't last long.

"During the week it is going to be warmer than you expect for this time of year. The warm air has been drawn from a long way south down in north Africa and is spreading north.

"But there is going to be a sharp contrast in weather as a cold snap sweeps across the country from Friday which is likely to bring snow to Scotland and the north of England.

"This will probably turn to sleet and rain in the south and we will have very brisk winds which will make it feel very cold."

This year has already brought some of the country's most bizarre weather ever, which has brought the country's worst drought since 1976 followed by the wettest summer for a century.

Source: The Telegraph

What is blood rain?

(BBC) - Weird weather is predicted in the UK this week and could include "blood rain". What is it?

If current weather forecasts turn out to be right, the weather will be a very mixed bag in the UK this week.

Unseasonably warm temperatures reaching 20C (68F) are predicted, followed by rain and possibly snow - and all over the next few days.

There is also a possibility of something called "blood rain" in the South East, but what is it?

"Blood rain" a term used for rain carrying sand from deserts. When the rain dries off it leaves a thin layer of dust which can sometimes be a reddish colour, hence the name. It is capable of coating houses, cars and garden furniture.

"It is a rather grandiose term for fine desert sand particles that are whipped up by winds and mix with the moisture in clouds," says a Met Office spokesman.

  • It is usually thought to be rain carrying dust from deserts
  • Storms cause dust or sand to mix with clouds
  • It can leave a fine coating of dust when it falls
  • Different coloured sand means it can be different colours, including red

Storms in the Sahara desert, which is around 2,000 miles away, are usually responsible for stirring up dust blown towards the UK, say weather experts. Watch Met Office satellite animation of such dust movement here.

The current winds arriving in the country are part of the band of warm air which is predicted to bring unseasonably warm temperatures over the next few days, followed by rain in some areas.

The rain and the fine layer of dust left after it falls can be reddish, but also other colours.

"The different coloured sands in the Sahara mean the rain and the coating it leaves can vary in colour," says weather expert Philip Eden.

"It can be reddish, but it is quite rare. It is more likely to be a sandy colour or brown. It's not as spectacular as it sounds."

"Blood rain" happens a few times a year in the UK, say experts.

It is more common in southern Europe like Spain and the South of France, which are closer to the Sahara. But it can travel longer distances and fall in areas like Scandinavia.

A well-documented incident of "blood rain" happened in 2001 in the southern Indian state of Kerala.

Photomicrograph of particles from a sample of red rain from Kerala - Source: Wikipedia.

In the middle of a monsoon, red rain started to fall and did so intermittently for several weeks. The colour was strong enough to stain clothes. There were also reports of green, yellow, brown and black rains.

Investigations suggested the rain was red because winds had stirred up dust from the Arabian Peninsula. Although another theory explored even suggested some sort of life form had fallen from the skies. It was reported at the time that Godfrey Louis, a physicist at Mahatma Gandhi University in Kottayam, concluded samples left over from the rains did not contain dust and instead had "a clear biological appearance".

For "blood rain" to leave a residue it needs to be a brief shower.

Dust storm in Sydney

"This is because there is a higher concentration of sand in a short shower," says Eden. "Heavier, more prolonged rainfall simply ends up washing away the residue."

There are very early recordings of "blood rain" in historical texts. It is mentioned in Homer's Iliad, thought to have been written in the 8th Century BC. The 12th Century writer Geoffrey of Monmouth, who made popular the legends of King Arthur, also referred to it and the 12th Century historian, William of Newburgh.

In earlier times it was believed the rain was actually blood and it was considered a bad omen. Often it was used in texts and literature to predict bad events.

With the spread of modern scientific method in the 17th Century, it started to be explained in terms of rational causes. By the 19th Century, the idea of dust being to blame started to dominate.

Source: BBC

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