Storm study reveals a sting in the tail

May 01, 2013
This is a weather pattern showing where a sting jet can form in relation to the front. Credit: The University of Manchester

Meteorologists have gained a better understanding of how storms like the one that battered Britain in 1987 develop, making them easier to predict. University of Manchester scientists, working with colleagues in Reading, Leeds and the US, have described how these types of cyclones can strengthen to become violent windstorms.

The Great Storm of 1987, which famously caught out weatherman Michael Fish, left a trail of destruction when winds up to 120mph swept across southern England and northern France, killing 22 people. More recently, gusts of 100mph in January 2012 damaged buildings in Scotland and cut power to tens of thousands of homes.

Such storms are characterised by severe gale-force winds known as sting that descend from several kilometres above the surface.

"Sting jets are these regions of that tend to occur to the south and south-east of the low centre at the end of the tail of the front," explained Professor David Schultz, who led the research in Manchester's School of Earth, Atmospheric and Environmental Sciences.

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Professor David Shultz, The University of Manchester, explains how cyclones, like the one that battered southern Britain in 1987, can strengthen to become violent windstorms. Credit: The University of Manchester

"These winds are generated from are a descending motion from air that is several kilometres above the surface to the north and north-east of the depression. While the weather front is intensifying, in a region known as frontogenesis ahead of the front, the winds are steadily rising then, in a region known as frontolysis at the tail end of the front, the winds start descending. If the descent is strong enough and other conditions are appropriate, the strong winds can reach the surface in this place called the sting jet."

The researchers, whose findings were published in the journal Weather and Forecasting, took to the skies to fly through a developing storm and measure the strength and direction of the winds.

"The irony is that the winds are strongest in the where the front is weakening most intensely.

"Our findings are significant because they tell us exactly where we can expect these winds and give added knowledge about the physical processes that are going on to create this region of strong winds."

Explore further: NASA satellites measure increase of Sun's energy absorbed in the Arctic

More information: 'Using Frontogenesis to Identify Sting Jets in Extratropical Cyclones,' is published in Weather and Forecasting.

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runrig
not rated yet May 01, 2013
I struggle here to discover anything I did not know when I was an on the bench Forecaster. If there is strong anticyclonic development to the rear of the Low then a squeeze takes place in the "backwash" winds. Aided by evaporative cooling within the frontal zone causing enhanced descent.

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