UK weather warning: THIS is why Britain has been smashed by TWO storms in 9 days | Weather | News

0
13


Storm Ciara and Storm Dennis caused deaths, structural damage, travel disruptions and severe flooding across the country over the course of two successive weekends. Express.co.uk spoke to a weather forecaster at Net Weather to find if these types of storms are becoming fiercer and more regular.

Met Office’s report states: “Several indicators in the latest UK State of the Climate report show that the UK’s climate is becoming wetter.

“One study found that climate change has increased the risk of floods in England and Wales, such as those in Autumn 2000 (the wettest Autumn on record), by at least 20 percent and perhaps 90 percent.

“More recently winter 2013/14 and winter 2015/16 have been the two wettest on record, with widespread impacts during both seasons.

“A Met Office study has shown that an extended period of extreme winter rainfall in the UK, similar to that seen in winter 2013/14, is now about seven times more likely due to human-induced climate change.

“December 2015 was the wettest December, and indeed any calendar month, in the UK series since 1910.”

While storm frequency this year isn’t necessarily higher than usual, two back-to-back named weather systems are quite rare and can be attributed to the jet stream.

The jet stream is a band of strong winds of up to 200mph high up in the atmosphere that moves low-pressure systems – which bring cloud, rain, and windy weather – across the globe.

The strength of the jet stream is determined by the difference between the temperature above the cold air in North America and the warmer climes of the tropics.

Ms Farrow said: “These two were quite extreme before Ciara and made the jet stream more intense.

“The higher the temperature contrast between the cold and hot air, the more extreme the jet stream.

“The jet stream was what we call zonal because it was travelling in a straight line.”

Because of the way it travelled, its strength was far higher than usual as when travelling in a straight line it is not obstructed and can gather momentum.

The jet stream can also meander its way across the globe, which slows it down.

Ms Farrow explained that when it meanders, pockets of low pressure can become stuck in between the bends.

This can lead to prolonged periods of rain in the low-pressure areas.

This month, a combination of a straight jet stream, cold polar temperatures and warmer tropical climes helped form Storms Ciara and Dennis.



Source link

LEAVE A REPLY

Please enter your comment!
Please enter your name here