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

06:50  15 february  2020
06:50  15 february  2020 Source:   washingtonpost.com

Storm Dennis will be a menace for the UK

  Storm Dennis will be a menace for the UK One week after Storm Ciara lashed the United Kingdom with heavy rain and extreme wind gusts, another storm is knocking at the door. © Provided by CNNStorm Dennis is now taking shape in the Western Atlantic and will become more menacing over the next day. A separate but powerful low-pressure system is already in the Atlantic, which will bring damaging winds and blowing snow to Iceland Friday.Coastal areas of Iceland could see hurricane-force winds Friday, with gusts over 124 mph (200 kph) warned the Icelandic met office. These two systems will dance around each other Friday before Dennis moves east.

Twin bomb cyclones to merge into one of strongest - ever storms in North Atlantic , hammering Iceland and threatening U.K. as Storm Dennis . A computer model projection of surface air pressure and wind speeds on Feb. 16 associated with Storm Dennis in the North Atlantic Ocean.

One of the strongest storms on record for the North Atlantic will hit Iceland on Friday and sideswipe the U.K. this weekend. Storm could rival the most powerful nontropical lows recorded in this region. Satellite view of an intensifying North Atlantic bomb cyclone , named Storm Dennis by the U.K. Met

A potentially unprecedented scenario is unfolding in the North Atlantic on Friday, as a bomb cyclone batters Iceland with hurricane-force winds and blizzard conditions, just as another bomb cyclone, known as Storm Dennis, rapidly intensifies behind it. Ultimately, the two storms will enter into a complex dance around each other before combining into one atmospheric behemoth, with a minimum central air pressure that could rank among the top three most intense storms ever observed in the stormy North Atlantic Basin.

A computer model projection of surface air pressure and wind speeds on Feb. 16 associated with Storm Dennis in the North Atlantic Ocean. (Earth.nullschool.net)© Earth.nullschool.net/Earth.nullschool.net A computer model projection of surface air pressure and wind speeds on Feb. 16 associated with Storm Dennis in the North Atlantic Ocean. (Earth.nullschool.net)

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. The forecast called for gusts of higher than 120 mph in a few locations, particularly on the western coast of the island, though conditions were improving early Friday afternoon local time.

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.

Bomb cyclones poised to form in the North Atlantic will rake Europe with high winds These storms then barrel east-northeastward toward Greenland and Iceland , with Now, the office is warning that Storm Dennis is on the way late in the week, advising residents to brace for “very strong winds

Storm Dennis will bring strong winds and heavy rain to northwestern Europe this weekend. The table below lists some notable examples of very intense North Atlantic storms in terms of lowest Storm Dennis could be among these most intense storms if its central pressure drops into the 920s

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The Icelandic Meteorological Office issued rare red warnings for parts of the country into early Friday, with orange warnings continuing into Friday night due to the strong winds and heavy precipitation, and travel was not recommended anywhere.

The National Weather Service’s Ocean Prediction Center reported that a satellite passing over the 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! Significant wave height is defined as the average of the highest one-third of waves in a particular period, and tends to run about half the height of single waves.

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 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 The North Atlantic cyclone Dennis is about to sweep the island with life- threatening wind gusts of

Storm Dennis will also develop a powerful windstorm over the Atlantic , gradually spreading severe winds into western Europe on Sunday! First , here is the overall picture across the North Atlantic – a *very* large extra-tropical cyclone # Dennis forms tomorrow (on Saturday, Feb 15th).

Buttressing the satellite observation, a buoy northwest of Ireland recorded a significant wave height of 41.3 feet Friday morning, which means individual waves were about twice as high, or nearly 80 feet, in that location.

This storm, and the one to follow it that are combining to form Storm Dennis, will turn the entire North Atlantic into a wave machine, with battering waves reaching Western Europe.

This storm battering Iceland underwent the process of bombogenesis, or rapid intensification, with its air pressure plummeting more than 24 millibars in 24 hours. Over the course of 48 hours, its pressure dropped by 67 millibars as it moved from near Nova Scotia early Thursday morning to near Iceland early Friday morning.

Energized by an unusually powerful jet stream — a highway of air at about 30,000 feet that is powered by the thermal contrasts between air masses — these weather systems are both developing rapidly and reaching extraordinary intensities in a region already known for strong winter storms. Winds in the core of the jet stream are forecast to be as strong as 240 mph late Friday, which could lead to another record for the fastest transatlantic flight, first broken Sunday.

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

  Storm Dennis, 2nd-strongest bomb cyclone on record in North Atlantic, causes severe flooding in U.K. Storm Dennis dumped more than a month's worth of rain in parts of Wales, flooding towns and prompting evacuations.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.

Since the reliable record keeping of tropical cyclone data within the North Atlantic Ocean began in 1851, there have been 1 ,574 systems of at least tropical storm intensity and 912 of at least hurricane

A storm may become a “ bomb ” depending on how fast the atmospheric pressure falls; drops in atmospheric pressure are a characteristic of “It speaks to the speed at which the storm intensifies.” “In terms of the sheer power of the system, I think it is one of the strongest ones we have ever seen

The low-pressure area intensifying southwest of Iceland, which innocuously passed off the East Coast of the United States on Thursday night, is projected to deepen even further than the current bomb cyclone battering Iceland.

Ultimately, though, these two storms will merge after doing a unique meteorological dance, resulting from what’s known as the Fujiwhara effect, when one storm orbits another. This will result in one giant swirl centered south of Iceland on Saturday, with related energy and its associated wind and heavy precipitation swiping across northwest Europe.

Amber weather warnings are in effect this weekend in Britain, where winds up to 70 mph are anticipated in Northern Ireland, Scotland and parts of northern England and north Wales. In addition, heavy rains could lead to flooding in the wake of deadly Storm Ciara this past week. The Met Office has named this system Storm Dennis, and computer models as well as meteorologists at the Ocean Prediction Center forecast its air pressure to plummet to between 916 millibars and 924 millibars. This range would qualify it among the top five strongest North Atlantic storms ever observed.

Army deployed as storm Dennis hits UK

  Army deployed as storm Dennis hits UK The British army was drafted in on Saturday as Storm Dennis descended on the country, with high winds and heavy rain threatening travel chaos and widespread flooding. British Airways and easyJet confirmed they had grounded flights, while two bodies were pulled from rough seas off the south England coast on Saturday as the storm barrelled in. One of the men is assumed to have been the subject of a search triggered when an LPG tanker reported that one of its crew was unaccounted for.© Oli SCARFF Members of the 4th Battalion Yorkshire Regiment erect flood barricades in Ilkley, West Yorkshire on Saturday He had been last seen several hours previously.

The storm , known as a " bomb cyclone ", is expected to continue to affect eastern North America into the weekend. After the snowfall ends, temperatures are expected to plunge as frigid air Two people in North Carolina whose pickup truck ran off a snowy road and overturned in a creek in Moore County.

Tropical storms are seasonal weather events. But they never fail to shock us with the destruction they wreak. There's a reason some parts of the world get hit by hurricanes more than others — it's built into Hurricane Sandy was one of the strongest hurricanes ever recorded over the Atlantic Ocean.

The circulation of the first bomb cyclone that will combine to form the larger Storm Dennis, with Iceland seen just to the left of the center of the swirl. (CIRA/RAMMB)© CIRA/RAMMB/CIRA/RAMMB The circulation of the first bomb cyclone that will combine to form the larger Storm Dennis, with Iceland seen just to the left of the center of the swirl. (CIRA/RAMMB)

“Storm Dennis will bring another very unsettled spell of weather this weekend with a risk of flooding, particularly in parts of England and Wales and also southern Scotland, where snowmelt will add to the flood risk,” Met Office chief meteorologist Steve Willington said in a statement. “Following Storm Ciara last weekend and further spells of rain this week, the ground is already saturated in places. With Storm Dennis bringing further heavy and persistent rain over the weekend, there is a risk of significant impacts from flooding, including damage to property and a danger to life from fast flowing floodwater.”

High winds and showers are expected to continue across Britain into Monday. Fortunately, the core of the storm will remain north of Europe, sparing the continent its full fury.

The strongest North Atlantic storm on record was the Braer Storm in 1993, which had a minimum central pressure of 913 millibars. Illustrating the dangers such storms pose to ships, this storm was named after an oil tanker that broke apart during the storms in the Shetland Islands, resulting in a large and damaging oil spill.

Storm Dennis brings mass flooding to U.K., while Brits ask, ‘Where’s Boris?’

  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.

This particular bomb cyclone could become one of the most intense off the East Coast in decades That wave has dragged freezing Arctic air down south into the eastern US, where then it got into The storm is moving very quickly, so it won’t lead to record snow, Oravec says. Most of the snow will

A fierce storm downed power lines, forced the cancellation of thousands of flights and inundated coastal A bomb cyclone is essentially a winter storm . At Revere Beach, north of Boston, the tumultuous Atlantic Ocean was churning up on the shore on Friday morning and threatening to flood

The third extraordinarily intense North Atlantic bomb cyclone in 10 days

This is the peak time of year 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 in the North Atlantic.

Very few of these storms typically see their minimum air pressure drop to 930 millibars or lower; yet assuming Storm Dennis does so, this will have happened three times in the past 10 days. (The low-pressure area that helped propel Storm 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 in the northeastern Atlantic. On Monday, the AO set a daily record for its most positive reading since such record-keeping began.

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.

In addition to the deaths and damage from Ciara, the winter’s North Atlantic storms have also affected North America. Last month, for example, Newfoundland and Labrador were buried by one of their worst blizzards on record, when a storm underwent rapid intensification and piled snow up to the second and third stories of buildings in downtown St. John’s.

Coldest air of the season is moving into the Midwest and the Northeast .
As of Thursday morning, 30 states from Montana to Massachusetts are under snow, flood and wind chill alerts. Thursday, the combined Arctic cold front and southern storm will continue to move to the East Coast, bringing strong to severe storms to the Carolinas with heavy rain from Washington D.C. to Boston. To the north, in New England and Western New York, some areas could see up to 6 inches of snow.© ABC News The combined Arctic cold front and southern storm will continue to move the East Coast bringing strong to severe storms to the Carolinas.

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