British officials urged millions of residents to “stay at home” as winds reached 122 mph. Thousands tuned into a YouTube channel that let them watch the tippy jets trying to manage gale-force winds at Heathrow.

Storm Eunice landed in the southwest of Ireland in the predawn hours, leaving tens of thousands without power, before barreling across to Britain.

At least nine people died in Europe as a result of falling trees or debris, with two men and a woman in England, a man in Ireland, a Canadian man in Belgium, and four people in the Netherlands dying. The storm knocked out power for tens of thousands of people in Ireland and the United Kingdom.

Authorities warned people that it was going to be severe. The U.K. Met Office weather service issued not one but two rare “red” weather warnings — the highest possible level — for Wales and parts of southern England, including London. It was the first time the British capital had received such a warning since the system was introduced in 2011.

The surprise star of the event, apart from Storm Eunice, turned out to be Jerry Dyer, an aviation enthusiast who broadcasts Big Jet TV on YouTube. His channel quickly went viral, with more than 200,000 people tuning in to watch planes land at Heathrow. Dyer narrated live from the airport, with the camera focused on shaky planes coming in one after another.

Not all of the planes made their landings. Some had multiple misses and had to go around and try again. While the highest gusts were found along the coast in both Ireland and the United Kingdom, Heathrow recorded a 70 mph gust.

Dyer’s footage was, at times, nail-biting, prompting some to question why Heathrow was still open. Others were mesmerized. As the planes came in, Dyer could be heard making comments like, “Oh, no, he’s off center!” and “Qatar’s third attempt folks, here we go!” and “Okay, this guy is coming in sideways.” He showed a little hometown pride when planes from British Airways came in for landing.

It wasn’t all giggles and thrills. According to the U.K. Met Office, the Needles on the Isle of Wight clocked a 122 mph gust, “provisionally the highest gust ever recorded in England.” The Needles are chalk landforms over the English Channel and home to a lighthouse in southernmost England.

Storm Eunice produced strong winds and large waves in Cornwall on Friday. (Tom Nicholson/Reuters)

In one dramatic scene, the roof of the O2 arena in London was ripped open by the winds. The O2, a major multipurpose venue popular for music concerts, hasn’t commented on its partially missing roof, but in a message on its website, it said that a concert by the Fugees scheduled for Friday evening had been canceled.

This may not have come as a surprise to anyone watching videos postedby one social media user with a view of the arena showing panel after panel tearing away.

The roof of the O2 arena was damaged by wind from Storm Eunice. (Stefan Rousseau/Associated Press)

Assessing how much damage Eunice has brought will take time. But by early Friday, the storm had caused widespread travel problems. All trains in Wales were suspended. Train operators across the rest of the country warned of disruptions, and several services were operating with a speed limit of 50 mph.

The beach is seen as waves crash over Newhaven harbor wall in England on Friday. (Glyn Kirk/Getty Images)

Others on social media shared images and footage of flying objects and falling debris. One user appeared rather surprised when he captured the moment that a giant tree toppled over in the middle of a seaside town. Network Rail, which runs most of the rail system in the United Kingdom, posted several alarming pictures and videos to explain why some trains were canceled, including a video of a building roof being blown onto railway tracks.

The government’s crisis committee, COBRA, met Friday afternoon amid reports that Eunice could be one of the most intense windstorms in decades. London Mayor Sadiq Khan urged people to “stay at home.”

A number of attractions, including the London Eye, a Ferris wheel on the Thames River, and Legoland, a theme park based in Windsor, closed Friday as a precaution. Some zoos and parks also closed.

The destructive gusts were brought on by a phenomenon known as a sting jet which, according to the U.K. Met Office, “is a core of strong winds which sometimes forms in rapidly deepening areas of low pressure and extends toward the ground.”

A mother walks her child past a fallen tree in London on Friday. (Andy Rain/European Pressphoto Agency)

Strong temperature contrasts help strengthen these jets, and the storm’s power can be traced to the collision of abnormally warm air over Western Europe and frigid air over the North Atlantic.

Climate change may have also played a role in Eunice’s strength. A recent study published in the journal Climate Dynamics concluded that in a warming world, “the frequency of extreme windstorms in Europe is projected to increase” and “a large contribution comes from sting jet storms.”

However, some scientists are not convinced about a strong link between climate change and storms such as Eunice. “Once in a decade storms like Eunice are certain to batter the British Isles in the future, but there is no compelling evidence that they will become more frequent or potent in terms of wind speeds,” said Richard Allan, professor of climate science at the University of Reading.

He added, however, that a moister atmosphere in a warmer climate “could make storms more potent” in a tweet, adding, “More intense rainfall due to the extra moisture and worse coastal flooding due to higher sea levels is more certain effect of #climate change on storms.”

In addition to the high winds, Eunice also brought heavy rain and snow to parts of Ireland and the United Kingdom. Severe flood warnings were issued for waterways in Gloucestershire, England, about 90 miles northwest of London.

Butchers shovel the snow from the path outside their shop in Scotland. (Andy Buchanon/Getty Images)

Eunice intensified at breakneck speed before it slammed into the British Isles, meeting the meteorological criteria of a “bomb cyclone,” Met Eireann tweeted.