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Storm Éowyn brought hurricane-level speeds - but here's the reason it wasn't classed as one

The wind speeds Ireland saw last night were as fast as some hurricanes.

STORM ÉOWYN BROUGHT maximum gust speeds of 183km per hour to Ireland overnight, beating Ireland’s previous record gust speed from 1945.

The gust speeds of 183km per hour were recorded at Mace Head in Carna, in the Connemara area of Co Galway, while a gust speed of 159.8km per hour was recorded at Moneypoint in Co Clare. Average wind speeds at Mace Head were around 130km per hour as of 5am.

These kinds of wind speeds are as fast as some hurricanes. 

On the Saffir-Simpson Hurricane Wind Scale, hurricanes with sustained wind speeds between 119 and 153km per hour are classified as Category 1 hurricanes.

However, Storm Éowyn is not technically a hurricane.

The reason why not has to do with how a storm first forms.

Storm Éowyn is a type of storm known as an “extratropical cyclone”.

Extratropical cyclones form in the ‘extra-tropics’ – that is, more than 30 degrees away from the equator, according to the UN Office for Disaster Risk Reduction.

A jet stream is often found relatively close by in the atmosphere, as is the case with Storm Éowyn. The strongest extratropical cyclones tend to occur in the winter months when the jet stream is at its strongest.

Hurricanes, however, are tropical storms that form over the North Atlantic Ocean and Northeast Pacific. 

The tropical latitudes cover 23.5 degrees north and south of the equator, between the Tropic of Cancer and Tropic of Capricorn, whereas extratropical storms form further away from the equator.

That means that even though Storm Éowyn has brought wind speeds similar to some hurricanes, it does not meet the technical definition of a hurricane because of where it was formed.

Dr Nicholas Leach of the Predictability of Weather and Climate research group at the University of Oxford has said that “Éowyn is an extratropical cyclone that has formed in the North Atlantic”.

“Storms like Éowyn typically form along the boundaries between high and low atmospheric temperatures, in this case along a cold front in the North Atlantic,” Dr Leech said in a statement.

“The cold air behind the front sinks, forcing the warm air to rise. The displacement of the warm air creates a low pressure center, drawing more air in,” he said.

“Feedbacks from air temperature and humidity gradients further fuel the intensification of the low pressure system and associated high winds and precipitation.

“Éowyn looks like an archetypal extratropical winter storm based on how it has formed out of a cold front in the North Atlantic.”

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    Mute Eoin Fleming
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    Feb 1st 2016, 6:47 AM

    It’s not that confusing. Just think that some of its a little long winded and old fashioned.

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    Mute Paul Mc Manus
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    Feb 1st 2016, 7:36 AM

    We’re talking about Americans here. They will find it confusing.

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    Mute Seán O'Ceallaghan
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    Feb 1st 2016, 9:13 AM

    Long winded but it makes sense, members of the party choose their nominee

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    Mute Nigel O'Neill
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    Feb 1st 2016, 9:45 AM

    Fianna Fail HQ take note!! Party members/supporters electing candidates at grass roots level…this may seem alien to you but worth noting

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    Mute ScewMadd
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    Feb 1st 2016, 12:09 PM

    Big talk Paul. Like we’re any better.

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    Mute NO 2 FF/FG/LAB
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    Feb 1st 2016, 6:18 AM

    #FeelTheBern

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    Mute Drew TheChinaman :)
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    Feb 1st 2016, 6:52 AM

    This time next year… Hashtag #HandedIt2TheTrump

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    Mute NO 2 FF/FG/LAB
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    Feb 1st 2016, 7:35 AM

    Actually national polling of likely voters has bernie beating trump by 13%. The only challange to bernie is Clinton. #walkinthepark

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    Mute Jurgen Remak
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    Feb 1st 2016, 7:54 AM

    Hillary or Sanders, it’s going to be no walk in the park against Trump. Too early for GOP vs Dem polls to be reliable. It will be one of the nastiest campaigns in memory, courtesy of Trump.

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    Mute Drew TheChinaman :)
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    Feb 1st 2016, 8:07 AM

    Polls are irrelevant… They assume a two party race where the GOP has yet to launch any counter campaign against Bernie.

    If the GOP pick another candidate, The Trump will likely run independently. If it’s Bernie vs. Trump Bloomberg will run independently.

    In a 4 way race.
    Bloomberg
    Trump
    Bernie
    Another GOP candidate.

    It’s anybody’s game. But I’d put the beloved leftie Bernie Sanders last.

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    Mute Jurgen Remak
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    Feb 1st 2016, 8:24 AM

    Agreed. Trump will hammer home the tag of ‘socialist’ against Sanders. Like it or not that remains a dirty word for many Americans – and not just the GOP faithful. Bloomberg’s effect will be interesting if he runs.

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    Mute Seán O'Ceallaghan
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    Feb 1st 2016, 9:15 AM

    The word that Trump will use though is Communist. There’s a good 40% of Americans that will never vote for a socialist

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    Mute Rob Cahill
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    Feb 1st 2016, 9:40 AM

    And evwn more of them don’t seem to know what a socialist or a communist is in the first place!!

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    Mute ScewMadd
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    Feb 1st 2016, 12:16 PM

    -90% tax on the richest (ie the richest move all money to the Cayman Islands)
    -Follow the national model of Sweden, a country that won’t be considered developed in twenty years
    -Pay the university bills of all citizens in a country with a massive population where college is extortionately expensive
    -Moronic ‘wage gap’ legislation
    -All of this at a time when the US is in trillions of debt and the stock market is permanently teetering

    I like a lot of what Sanders professes, I don’t think he’s a bad person, but I don’t think much of it is realistic or viable, particularly given the situation economically. Much as I’d like to take money from people that screwed the workers over, you have to be careful in how you do it. If they get spooked, they’ll hide all their money so well you’ll never see a penny.

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    Mute Michael Sands
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    Feb 1st 2016, 1:40 PM

    https://www.youtube.com/watch?v=vt-vG_TdOT4
    “In 1988, high school senior Ted Cruz reflected on his life’s ambitions while attending Second Baptist School in Houston, TX. Now, he is a Republican Senator running for the office of the President of the United States of America.”

    Like Pinky and the Brain? lol.

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    Mute Marg murphy
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    Feb 1st 2016, 7:40 AM

    Bernie Saunders is a mystery to me. A died in the wool socialist getting within an asses roared of the White House. George soros, the insidious globalist one worlder and hater of western civilisation has a hand in this I’ve no doubt. There’s strings being pulled here that have one aim. The destruction of western civilisation by flooding all successful, western functional countries with migrants from dysfunctional, third world countries with a handy dose of oppositional culture and religion thrown into the mix to ensure societal breakdown. Add to this the left’s propensity to muzzle dissent by screeching racism at every turn has cowed the citizenry , we are like deer in the headlights in the face of this invasion and the unwillingness of our elected leaders and media do call it like it is. Angela Merkyl, Bernie Saunders are tools of this agenda. This compliance in our own destruction makes no sense.

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    Mute Sinead O'Callaghan
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    Feb 1st 2016, 8:19 AM

    I hear it’s termed “white guilt” …a terrible affliction.

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    Mute trebloc01
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    Feb 1st 2016, 7:42 AM

    What about those registered as independents

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    Mute John Galvin
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    Feb 1st 2016, 11:47 AM

    I can tell you what happens in Oklahoma. Independents have no say in the primaries. You have to either be a registered democrat or Republican.

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    Mute Rosie Gluten
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    Feb 1st 2016, 9:20 AM

    “Donald Trump is a carnival man,an entertainer, a buffoon.

    His fans are white,scared and angry. He will never be elected,not so long as minorities,liberals and educated people vote,but he has certainly exposed the ugly underbelly of conservatives in America today.” -Stephen King

    They haven’t got the majority of women voting for them either -and as long as they keep on attacking Roe v Wade ( even though the majority 70% want it to stay ) and Planned Parenthood -then they will continue in the wilderness …

    Have a nice day folks..

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    Mute Aidan Finn
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    Feb 1st 2016, 9:35 AM

    It’s a simple and democratic process; you move an ass until it is in the correct position, and tickle it’s testicles with a turkey feather until it kicks out at the sheet of paper with the X made by your favored candidate, just as the forefathers foresaw it.

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    Mute Zx5vZulB
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    Feb 1st 2016, 1:38 PM

    Thanks for the insight into foreign electoral processes, I’m still getting my head around the order in which to vote for my chosen candidates in wicklow to really care though!

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    Mute Michael Sands
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    Feb 1st 2016, 1:35 PM

    “How do Republicans do it? ” In the dark and using Foxy Noise, sorry that should be Fox News lol.

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    Mute Michael Sands
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    Feb 1st 2016, 1:32 PM

    “Eeny, meeny, miny, moe”, is another way to explain it lol.

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