Forecasters look higher to make better cold weather predictions

Jan 18, 2013
Forecasters look higher to make better cold weather predictions

(Phys.org)—As Britain shivers through another spell of snow and ice, new research could help weather forecasters predict when such cold snaps are likely to occur.

Professor Ted Shepherd, an expert on the at the University of Reading, is co-author of a research paper published this week that helps to confirm the value of studying what's going on high up in the atmosphere to help predict the we are likely to see at the surface.

Weather forecasts mainly focus on the - the lower layers of the atmosphere from the earth's surface up to around 10km - as that is where most of our weather comes from.

However, scientists are increasingly learning that changes to the upper layers of the atmosphere, such as the stratosphere, can have a significant effect on our weather. In a paper published in Nature Geoscience, Professor Shepherd, working with colleagues in Toronto, Canada, where he worked prior to coming to Reading, found evidence that detecting sudden increases in temperatures, high up over the Arctic, was a good indicator that people in Britain and northern Europe could paradoxically expect a big freeze.

The researchers found that these 'stratospheric sudden warming' events were more helpful than had previously been thought in helping forecasters provide better winter forecasts, and could help to predict a in Britain and several weeks ahead.

Professor Shepherd said: "It is well known that stratospheric sudden warming events can affect weather for a period of up to two months.

"The issued recently by a number of weather centres predict that Britain will be about 1 degree centigrade colder than average through to the end of February. That might not sound like a lot but averaged over a month it makes quite a difference.

"Our research has shown how a sudden warming high in the stratosphere can add extra skill to wintertime seasonal forecasting - which, evidence shows, had previously been very difficult to get right. Our work shows that we can have more confidence in seasonal winter predictions when these high atmosphere warming events occur."

Explore further: Volcanic plumbing at mid-ocean ridges goes far deeper than thought

More information: Sigmond, M. et al., 'Enhanced seasonal forecast skill following stratospheric sudden warmings', Nature Geoscience (2013) doi:10.1038/ngeo1698

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Jeddy_Mctedder
1 / 5 (4) Jan 18, 2013
As an amateur meteorologist who always has focussed on the gaps in the macro understanding of the sphere and its cooling mechanism its fairly clear that radiation and depressurization of atmospheric gasses at high lattitude is where the vast bulk of heat of earth is 'lost' to space. [the last being electrostatic eruptions upward like sprites] .We rarely talk about how difficult it is to study this part of the atmosphere by its very nature.

It is to thin to provide bouyancy let alone lift and it is far to thick for perpetal freefall (orbitting)
One can only pass through it with a rocket and even then you change your immidiate surroundings by depositing your exaust into the local space which you are trying to study.

Its time we start facing our inability to adequately studdy this space.
Sherrin
1 / 5 (1) Jan 24, 2013
The editor (or perhaps the author) has not explained how a sudden stratospheric warming event is linked to a cold spell in Boris Johnson's backyard. Or is it? Is this article saying that when such a sudden event occurs, then it is reasonable to predict warmer surface weather?