Britain to be hit by RARE weather phenomenon TODAY as Helm Wind strikes

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Britain to be hit by RARE weather phenomenon TODAY as Helm Wind strikes‘Express.co.uk

Britain to be hit by RARE weather phenomenon TODAY as Helm Wind strikes

The strong north-easterly wind produces a phenomena dubbed a lee wave by blowing at a constant speed and direction through a layer of stable air.

Met Office forecasters warned the Helm, known to be very gusty, is set to hit the south-west slopes of Cross Fell in Cumbria.

Forecasters said: “When a wind blows at a constant speed and direction through a layer of stable air perpendicular to the ridge or peak of hills and mountains, the result is something called a lee wave.

The air is squeezed as it passes over the high ground and descends briefly downwind (the lee side) of the hill

“Because the air is stable, it tries to re-establish itself by rising again and this causes a waveform. Where the wave crests you can end up with clouds.”

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  • Publisher: Express.co.uk
  • Date: 2018-04-12T14:00:00+01:00
  • Author: Rebecca Perring
  • Citation: Web link

While you’re here, how about this:

Bizarre weather phenomenon ‘Helm Wind’ set to hit UK today

British weather is getting even weirder, as a rare phenomenon called “Helm Wind” is set to hit the country

Spring showers will soon make way for sunshine and soaring temperatures as winds carrying murky clouds and fog are driven out, forecasters say.

Parts of the UK could enjoy highs of 22C (71.6F) as the temperature gradually climbs towards the weekend and into next week.

It comes as eastern parts of the UK suffered under drizzle and gloomy conditions mid-week, struggling to get above 7C (44.6F), the Met Office said.

The muggy conditions have ridden in on winds from the east, but this will soon be replaced by softer gusts from the south which will allow warmth to break through.

Gigantic rolling cloud ‘tsunami’ sweeps across the ground in rare weather phenomenon caught on incredible footage

This is the awe-inspiring moment a ‘tsunami cloud’ sweeps across the landscape rolling over the earth like a gigantic wave.

The clip, shot in’Leavitt, Alberta, Canada, shows the eerie weather formation gathering in a scene chillingly reminiscent of ice cloud brought by the white walkers in Game of Thrones.’

Engulfing the whole horizon, the rare cloud creeps across the frame until it blankets the entire view in a whiteout.’

Lasting several minutes, the unusual cloud formation brought with it several inches of snow in the hours following, marking a very cold beginning to Canada’s spring.

‘The clouds rolled in as quickly as they left – they completely covered the sky and it started to snow.

Watching: Helm Wind, Cross Fell, Helm Wind

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Britain to be hit by RARE weather phenomenon TODAY as Helm Wind strikes
on 12th of Apr 2018 The strong north-easterly wind produces a phenomena dubbed a lee wave by blowing at a constant speed and direction through a layer of stable air. Met Office forecasters warned the Helm, known to be very gusty, is set to hit the south-west slopes of Cross

Bizarre weather phenomenon ‘Helm Wind’ set to hit UK today
on 12th of Apr 2018 But today, British weather is getting even weirder, as a rare phenomenon called “Helm Wind” is set to hit the country. The strong north-easterly wind is the only named weather of its kind in the UK, and produces unusually shaped cloud formations.

Something additional to look at:

Gigantic rolling cloud ‘tsunami’ sweeps across the ground in rare weather phenomenon caught on incredible footage
on 12th of Apr 2018 The remarkable footage shows the cloud rolling across the ground like a wave It formation is thought to be a ‘stratus cloud’ which stick close to the earth Gobsmacked onlookers filmed the amazing scene in Leavitt, Canada last month

Nine of the world’s rarest cloud formations and the science behind them
on 12th of Apr 2018 v=at&w=485&h=273&api=7db9fe61-7414-47b5-9871-e17d87b8b6a0 400w, https://dsx.weather.com/util/image/w/uk-wikipedia-helm-wind-cloud-oldfaw.jpg?v=ap&w=980&h=551&api=7db9fe61-7414-47b5-9871-e17d87b8b6a0 800w” > The affects of the rare phenomenon produces

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