“We may have to get used to winters where spells of weather go on for weeks – or even months”
The main system that helps determine the weather over Northern Europe and North America may be changing, research suggests.
The study shows that the so-called jet stream has increasingly taken a longer, meandering path.
This has resulted in weather remaining the same for more prolonged periods.
The work was presented at the annual meeting of the American Association for the Advancement of Science (AAAS) in Chicago.
The observation could be as a result of the recent warming of the Arctic. Temperatures there have been rising two to three times faster than the rest of the globe.
According to Prof Jennifer Francis of Rutgers University in New Jersey: “This does seem to suggest that weather patterns are changing and people are noticing that the weather in their area is not what it used to be.”
The meandering jet stream has accounted for the recent stormy weather over the UK and the bitter winter weather in the US Mid-West remaining longer than it otherwise would have.
“We can expect more of the same and we can expect it to happen more frequently,” says Prof Francis
The jet stream, as its name suggests, is a high-speed air current in the atmosphere that brings with it the weather.
It is fuelled partly by the temperature differential between the Arctic and the mid-latitudes.
If the differential is large then the jet stream speeds up, and like a river flowing down a steep hill, it ploughs through any obstacles – such as areas of high pressure that might be in its way.
If the temperature differential reduces because of a warming Arctic then the jet stream weakens and, again, like a river on a flat bed, it will meander every time it comes across an obstacle.
This results in weather patterns tending to becoming stuck over areas for weeks on end. It also drives cold weather further south and warm weather further north. Examples of the latter are Alaska and parts of Scandinavia, which have had exceptionally warm conditions this winter.
The Latest on: Weather shift
via Google News
The Latest on: Weather shift
- Better cotton crops predicted during current yearon April 25, 2021 at 3:29 pm
MULTAN: Director General Agriculture Punjab Dr Anjum Ali Butter said that due to dry weather this year, better ...
- Weather roller coaster: Quick storm, maybe hail, more heat, weekend rain in Sacramento?on April 20, 2021 at 12:14 pm
Forecasters believe this weather shift could produce chances of rain and mountain snow. Showers & isolated thunderstorms are forecast to develop over #Norcal today. Small hail, brief heavy ...
- 10 hearty dishes for one unseasonable day in St. Louison April 20, 2021 at 6:24 am
There is no shortage of hearty French fare at Gerard Craft’s delightful Central West End eatery, but there’s something about the braised beef that just screams snow day. Served with glazed carrots, ...
- More Spring Surf For East Coast and Caribbeanon April 13, 2021 at 1:50 pm
And now, the East Coast has more waves lining up through the coming weekend, along with another weather shift — chilly to mild temps and rainy, overcast conditions. Not that surfers are ...
- ‘Perfect ingredients’ for week of storms to hit Warwick, potential for 80mmon March 7, 2021 at 4:18 pm
A “slow moving” south-westerly trough and an “upper eastern trough” were the cause of the weather shift and Ms Wong said there was a potential for storm damage. “It is the perfect ...
- Snow possible this weekend in Grass Valleyon January 20, 2021 at 5:30 pm
Mueller said it is “pretty common to see fairly quick changes” when it comes to a weather shift like the one expected this week, especially in the pattern observed so far — today is expected to be ...
- Wednesday morning video forecaston November 18, 2020 at 4:18 am
Today is the coolest day in the 7-day forecast. A weather shift is on the way. Today and Tonight: This afternoon will be a few degrees cooler than yesterday. The Baton Rouge area will reach the ...
- MDA safety guide for winteron December 5, 2017 at 5:18 am
I wish a warm and safe winter to the general public.” Following the weather shift, MDA shares various safety guidelines for a safer winter, in order to learn how to protect ourselves and our ...
- Take 5: An interview with A-Basin ski patroller Kyle Hagadornon December 1, 2015 at 10:33 am
My job is as an avalanche tech at the ski area, and that entails covering a weather shift that gets us in at 5 a.m. We build the snow and weather forecast for the ski area for the day, then build ...
via Bing News