UK Five Day Weather Forecast February 14

The

jet stream is made up from ribbons of very strong winds moving weather systems around the globe. 

These winds are normally located in the atmosphere up to 10 miles above the Earth and can reach speeds of 200 mph.

FIVE-DAY FORECAST: Plenty of showers and felling cooler

Waves or ripples along the jet stream can force Atlantic depressions to deepen violently as they are driven towards the UK, so they play a very important part in forecasting.

The position of the jet stream varies due to environmental conditions caused by temperature differences between tropical and polar air masses pushing the system around the atmosphere. 

If the jet stream path falls to the south of the UK, it pulls down cold air across the country from the Arctic.

But when it sways north, it attracts warm air from Europe or the tropics, which encourage temperatures to rise in the UK.

READ MORE: What's the difference between rain and showers?

It can also move from west to east and can affect cyclonic storm systems at lower levels in the atmosphere.

Normally the jet stream steers a path to the north of the UK, but when it sinks southwards, the weather becomes unsettled and resulting conditions can be quite potent.

Back in February and March the jet stream plunged southwards, dragging bitterly cold air from Siberia towards the UK - dubbed the ‘Beasts from the East’. 

In 2007 and 2012, Britain experienced severe flooding as a result of the polar jet staying south for the summer.

SLIDESHOW: Seven incredibly rare, bizarre and common types of lightning (PHOTOS)

Source : https://weather.com/en-GB/unitedkingdom/weather/news/2018-08-14-uk-weather-jet-stream-shift-low-pressure-dominates

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