| The strong winds that hit the Pacific Coast are from extratropical storms, not hurricanes, which are tropical cyclones. |
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| Winter storms are extratropical storms and all are a mixture of warm and cold air. |
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| Today, a bomb cyclone is an extratropical area of low pressure in which the central barometric pressure drops at least 24 millibars in 24 hours. |
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| Two main types of storms affect Atlantic Canada: the tropical cyclone and the extratropical cyclone. |
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| Danny continued to move northeastward across the United States and into the Atlantic where it became extratropical. |
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| The weather is also different from a purely extratropical storm systems that are common in Canada. |
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| Data collection was limited to extratropical regions to avoid the poor preservation and minimal sampling associated with tropical environments during this time. |
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| Elsewhere in the southern states, flooding is mostly a winter-spring phenomenon, associated with unusually frequent or active extratropical depressions and fronts. |
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| The low moved southward and developed into an extratropical storm 625 kilometres south of Halifax. |
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| By the time the tropical system had formed on November 2nd, the extratropical system was on the wane and conditions were improving on the coasts. |
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| First, an extratropical cyclone is a specific type of cyclone with a particular structure and geometry. |
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| When Ana moved over Newfoundland on the 19th it had lost most of its extratropical characteristics. |
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| Floyd continued as an extratropical storm all the way to the European continent. |
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| Winter storms are large-scale weather systems, hundreds of kilometres across, that are called extratropical cyclones because they form and develop outside of the Tropics. |
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| A nor'easter is formed in a strong extratropical cyclone, usually experiencing bombogenesis. |
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| In addition to the flight crew and research scientists there was also a camera crew gathering footage aboard the aircraft for a documentary under production on extratropical transition storms. |
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| Additionally, tropical cyclone motion can be influenced by transient weather systems, such as extratropical cyclones. |
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| This study involved wind and wave hindcasting for hurricanes and extratropical storms, as well as wave refraction and extremal analysis for selected sites. |
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| An extratropical cyclone is a storm that derives energy from horizontal temperature differences, which are typical in higher latitudes. |
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| Rapid extratropical cyclone development, called explosive cyclogenesis, is often associated with major winter storms and occurs when surface pressure falls by more than about 24 millibars per day. |
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| From an operational standpoint, a tropical cyclone is usually not considered to become subtropical during its extratropical transition. |
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| A separate study in the Northern Hemisphere suggests that approximately 234 significant extratropical cyclones form each winter. |
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| The low became absorbed in a circulation of a large extratropical low pressure system off Newfoundland by July 20, as it continued rapidly northeastward. |
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| While extratropical cyclones form and intensify in association with fronts, there are small-scale cyclones that appear in the middle of a single air mass. |
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| The seeds for many current ideas concerning extratropical cyclones were sown between 1912 and 1930 by a group of Scandinavian meteorologists working in Bergen, Nor. |
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| Cyclones that progress no farther than the developing stage are referred to as wave cyclones, while extratropical lows that reach the mature and occluded stages are called baroclinically unstable waves. |
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| When tropical cyclones undergo extratropical transition, the symmetric rain bands around the cyclone shift to a larger area of rain that is almost entirely to the left of the storm track. |
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| But the extratropical storm that hit was as powerful as any Category 1 hurricane, and it delivered the most damaging waves felt along the coast in at least 50 years. |
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| The transformation of a tropical cyclone into an extratropical cyclone. |
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| In the Italian island of Sardinia, extratropical storm named Ruven brought more than 385 millimeters of rain in less than 24 hours, killing at least 18 people. |
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| Strong extratropical cyclones have been shown to deepen significantly along a shallow frontal zone, forced by the Gulf Stream itself during the cold season. |
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| Many tropical cyclones are eventually forced toward the northeast by extratropical cyclones in this manner, which move from west to east to the north of the subtropical ridge. |
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| Most of them were either extratropical or tropical storms when they impacted the region, although several Category 1 hurricanes have reached the Azores. |
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| Most strong storms lose their strength very rapidly after landfall and become disorganized areas of low pressure within a day or two, or evolve into extratropical cyclones. |
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| These kinds of cyclones, known as extratropical cyclones and subtropical cyclones, can be stages a tropical cyclone passes through during its formation or dissipation. |
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| A subtropical cyclone is a weather system that has some characteristics of a tropical cyclone and some characteristics of an extratropical cyclone. |
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| Frontal precipitation is caused by frontal systems surrounding extratropical cyclones or lows, which form when warm and often tropical air meets cooler air. |
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| Extratropical cyclones tend to form east of climatological trough positions aloft near the east coast of continents, or west side of oceans. |
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