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World Storm Dennis, 2nd-strongest bomb cyclone on record in North Atlantic, causes severe flooding in U.K.

00:20  17 february  2020
00:20  17 february  2020 Source:   washingtonpost.com

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Storm Dennis , the second- strongest nontropical storm on record in the North Atlantic Ocean, caused widespread flooding across parts of the Video showed a landslide moving down a mountain in Tylerstown, South Wales, on Sunday morning. Several severe flood warnings were issued

Twin bomb cyclones to merge into one of strongest -ever storms in North Atlantic , hammering Iceland and In addition, heavy rains could lead to flooding in the wake of deadly Storm Ciara this past week. The strongest North Atlantic storm on record was the Braer Storm in 1993, which

Storm Dennis, the second-strongest nontropical storm on record in the North Atlantic Ocean, caused widespread flooding across parts of the United Kingdom on Sunday, along with winds exceeding hurricane force.

a car parked in front of a house covered in snow: Floodwater surrounds abandoned cars in Tenbury Wells, in western England, after the River Teme burst its banks on Sunday. (Oli Scarff/AFP/Getty Images) Floodwater surrounds abandoned cars in Tenbury Wells, in western England, after the River Teme burst its banks on Sunday. (Oli Scarff/AFP/Getty Images)

The storm, which is producing waves up to 80 feet tall west of the U.K., dumped more than five inches of rain in South Wales, almost an inch more than the area typically receives for the entire month of February. The resulting flooding has prompted numerous evacuations and even cut off some communities.

Series of bomb cyclones poised to form in the North Atlantic, will rake Europe with high winds, ‘phenomenal seas’

  Series of bomb cyclones poised to form in the North Atlantic, will rake Europe with high winds, ‘phenomenal seas’ A string of extraordinarily powerful storms is churning the waters of the North Atlantic and threatening Europe.One such storm, which the U.K. Met Office named Storm Ciara, struck this past weekend, flooding homes, shutting schools and severing power as it battered Europe and Britain with wind speeds of nearly 100 mph.

Storm Dennis , one of the Atlantic ’s most powerful bomb cyclones , churns up 100-foot waves and slams U . K . Add to list. On my list. This is one of the top 5 strongest nontropical cyclones on record for the North Atlantic Ocean. People struggle with umbrellas as they walk in Bournemouth, Britain

Severe Weather Europe. The WW3 model animation of significant wave heights spreading across the North Atlantic between Feb 14th and 17th, associated with the extremely deep extra-tropical cyclone # Dennis . Storm Dennis hits UK & Ireland! Massive waves, floods and windy dogs

The U.K. Met Office, which named the storm, issued its first “red” warning for heavy rainfall since 2015, its highest warning category. The country’s Environment Agency issued a record number of flood warnings, 594, on a single day, according to John Curtin, executive director of flood and coastal risk management at the Environment Agency.

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While the rainfall totals were noteworthy, they were not unprecedented. However, coming just one week after another severe bomb cyclone, known in the U.K. as Storm Ciara, the ground was already saturated when this one arrived. This caused many rivers, creeks and streams to overflow their banks and even triggered landslides.

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Storm Dennis explodes into a furious bomb cyclone over the Northern Atlantic Ocean. Further strengthening may put Dennis in the running for being one of the most intense North Atlantic storms on record . Bomb Cyclone Storm Dennis will bring extreme winds in UK and Ireland.

Storm Dennis "The Menace," is rolling toward Ireland and the UK and will bring more flooding for the Thousands of homes are in danger of being flooded in Ireland and the UK this weekend. The other storm is bringing strong winds to Greenland. Storm Dennis has become a bomb cyclone

Video showed a landslide moving down a mountain in Tylerstown, South Wales, on Sunday morning. Several severe flood warnings were issued, meaning the conditions posed a danger to life. Gwent County police said residents of Skenfrith, Monmouthshire, were being advised to evacuate because of the flooding.

The Environment Agency has predicted the River Ouse in York could rival record levels seen in 2000.

Slideshow by photo services

Twin bomb cyclones to merge into one of strongest-ever storms in North Atlantic, hammering Iceland and threatening Britain as Storm Dennis

  Twin bomb cyclones to merge into one of strongest-ever storms in North Atlantic, hammering Iceland and threatening Britain as Storm Dennis One bomb cyclone is slamming Iceland with hurricane force winds on Friday, while another is hot on its heels. These storms will combine into one giant swirl, rivaling all other North Atlantic storms on record.Already on Friday morning, the first bomb cyclone, which has a minimum central air pressure of 929 millibars, roughly equivalent to a Category 4 hurricane, is slamming Iceland with blizzard conditions, mixed precipitation and heavy rain. Winds have been clocked at about 70 mph in the capital city of Reykjavik, and 90 mph at the international airport in Keflavik.

Forecasts call for more high winds and showers Monday as the storm center slowly spins to the northeast of the region. Water levels in many rivers are not expected to crest until Monday or Tuesday, which will prolong the flood risks.

The storm is being blamed for at least two deaths in the U.K., after two bodies were pulled from rough seas in separate searches along England’s southeastern coast. In addition, a man in his 60s fell into the River Tawe in South Wales on Sunday morning, though that death has not been tied to the storm, according to the BBC.

In addition to heavy rain, the storm also produced wind comparable to a Category 1 hurricane, which is noteworthy considering its center was just south of Iceland and the strongest winds were roiling the seas hundreds of miles northwest of Ireland. Nevertheless, a wind gust to 91 mph was recorded at Aberdaron in North Wales on Saturday, with several gusts to 70 mph or greater noted elsewhere.

Storm milestones

a waterfall in the snow: Storm Dennis, seen near peak intensity as it spun south of Iceland on Saturday. (NASA) Storm Dennis, seen near peak intensity as it spun south of Iceland on Saturday. (NASA)

Dennis resulted from the rare merger of two unusually intense bomb cyclones, which on Saturday recorded a minimum central air pressure of 920 millibars (mb). According to a list maintained by Christopher Burt, a weather historian at Weather Underground, Dennis ranks as the second-strongest storm on record for this region. (The top spot is still occupied by the Braer Storm of 1993.)

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The storm maintained an intensity of 930 mb into Sunday, which is a strength that few nontropical storms ever reach, let alone maintain for extended periods. The air pressure in the center of Dennis plunged by 56 millibars in 24 hours, between 4 p.m. Eastern time Friday and the same time Saturday, according to the U.S. National Weather Service’s Ocean Prediction Center. This was more than twice the intensification rate required to be considered a bomb cyclone.

In general, the lower the pressure, the stronger the storm. The 920 mb reading was roughly equivalent to what would be observed in a Category 4 or 5 hurricane.

[Roaring jet stream powers British Airways flight from New York to London in under 5 hours, an unofficial record]

Before it merged with an intense low-pressure area swinging northeast of Newfoundland on Friday night and Saturday morning, the first bomb cyclone in this series dealt Iceland a severe blow, with blizzard conditions and winds up to 108 mph Thursday night and Friday. The Ocean Prediction Center reported Friday that a satellite passing over that storm detected a significant wave height of 64 feet west of Ireland. This means individual waves in that area were potentially as high as 128 feet.

At its peak, Dennis produced individual waves at least 112 feet tall, along with sustained winds of hurricane force. It occupied an extraordinary stretch of real estate, extending from south of Iceland southeast into Britain and southwest across the Atlantic and into the Gulf of Mexico.

a man riding a wave on top of a snow covered mountain: Powerful waves break on the shoreline of Porthleven, in southwestern England, on Sunday. (Alastair Grant/AP) Powerful waves break on the shoreline of Porthleven, in southwestern England, on Sunday. (Alastair Grant/AP)

A nearly 5,000-mile-long cold front connected Dennis to a plume of tropical moisture, known as an atmospheric river. On Sunday, that connection was more abbreviated but still evident based on satellite imagery.

Storm Dennis spawns major flooding in UK as 'danger to life' warnings issued

  Storm Dennis spawns major flooding in UK as 'danger to life' warnings issued An explosive winter storm that roared across the North Atlantic over the weekend is still having impacts across central England and Wales, as authorities on Tuesday declared severe flood warnings across the region.The Met Office, Britain's meteorological service, declared 10 severe flood warnings, meaning there is a "danger to life" for rivers Severn Trent, Wye and Lugg. More than 180 less severe flood warnings were also in place. Additional rain is in the forecast for Wednesday and Thursday, possibly extending flooding conditions.

Dennis is not an isolated event, but rather part of a string of bomb cyclones that have prowled the waters of the North Atlantic in recent weeks.

Energized by an unusually powerful jet stream — a highway of air at about 30,000 feet that is driven by the thermal contrasts between air masses — these weather systems have been developing rapidly and reaching extraordinary intensities in a region already known for strong winter storms. Winds in the core of the jet stream reached 240 mph late Friday, which led transatlantic flights to see ground speeds exceeding 800 mph, though the record for fastest transatlantic passenger flight, first broken Sunday, held.

Friday marked the date of the climatological peak for bomb cyclones in the North Atlantic, given the typical intensity of the jet stream and intense air mass differences that tend to move over moisture-rich waters. What’s been especially noteworthy about the winter’s weather, however, is the frequency and intensity of the storms spawned here.

A bomb cyclone machine

Very few of these storms typically see their minimum air pressure drop to 930 millibars or lower; yet this has now happened three times in the past 10 days, with Dennis ranking as the most intense of the three storms. (The low-pressure area that helped propel Ciara into Europe last weekend accomplished this feat as well.)

The strong near-zonal — or straight west-to-east — jet stream is characteristic of periods when a weather pattern above the North Atlantic, known as the Arctic oscillation (AO), is in a what is known as a positive state, with low pressure predominating near Greenland and a ridge of high pressure to its south.

The AO is one of the main reasons winter has been absent in much of the eastern United States and parts of Europe, and it’s helping to turn the North Atlantic into a virtual bomb cyclone express lane.

There are some signs that Dennis may have been sufficiently large and intense to cause this persistent weather pattern to change. Computer models on Sunday signaled cooler than average conditions might arrive in the eastern United States for early March, potentially giving rise to some snow events after all.

The Associated Press contributed to this report.

Storm Dennis brings mass flooding to U.K., while Brits ask, ‘Where’s Boris?’ .
At least three have died from the flooding unleashed by the storm.And with flood warnings still pinging on the telly like traffic alerts during a London rush hour, the storm is now raining on Prime Minister Boris Johnson, too, who is facing a torrent of criticism for his government’s response.

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