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Hybrid Low (other)
Hybrid low may refer to a number of different meteorological depressions: *Kona storm, seasonal cyclone in the Hawaiian Islands *Mediterranean tropical-like cyclone, rare meteorological phenomena observed in the Mediterranean Sea *Nor'easter, a synoptic-scale cyclone *Polar low, a small-scale, short-lived depression over certain ocean areas *Subtropical cyclone, a weather system that has some characteristics of a tropical and an extratropical cyclone *Superstorm, a large, destructive storm without another distinct meteorological classification Examples *1991 Perfect Storm, a nor'easter that absorbed Hurricane Grace * 1996 Lake Huron cyclone, a strong cyclonic storm system over Lake Huron *Hurricane Catarina, an extremely rare South Atlantic tropical cyclone * 2006 Central Pacific cyclone, an unusual low pressure system that formed in 2006 * Tropical Storm Haiyan (2007), It developed from a tropical low that formed northeast of Wake Island *Tropical Storm Omeka, Central Pacific st ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Depression (meteorology)
In meteorology, a low-pressure area, low area or low is a region where the atmospheric pressure is lower than that of surrounding locations. Low-pressure areas are commonly associated with inclement weather (such as cloudy, windy, with possible rain or storms), while high-pressure areas are associated with lighter winds and clear skies. Winds circle anti-clockwise around lows in the northern hemisphere, and clockwise in the southern hemisphere, due to opposing Coriolis forces. Low-pressure systems form under areas of wind divergence that occur in the upper levels of the atmosphere (aloft). The formation process of a low-pressure area is known as cyclogenesis. In meteorology, atmospheric divergence aloft occurs in two kinds of places: * The first is in the area on the east side of upper troughs, which form half of a Rossby wave within the Westerlies (a trough with large wavelength that extends through the troposphere). * A second is an area where wind divergence aloft occurs ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tropical Storm Haiyan (2007)
The 2007 Pacific typhoon season was a below average season which featured 24 named storms, fourteen typhoons, and five super typhoons. It was an event in the annual cycle of tropical cyclone formation, in which tropical cyclones form in the western Pacific Ocean. The season ran throughout 2007, though most tropical cyclones typically develop between May and November. The season's first named storm, Kong-rey, developed on March 30, while the season's last named storm, Mitag, dissipated on November 27. The season's first typhoon, Yutu, reached typhoon status on May 18, and became the first super typhoon of the year on the next day. The scope of this article is limited to the Pacific Ocean, to the north of the equator between 100°E and the 180th meridian. Within the northwestern Pacific Ocean, there are two separate agencies that assign names to tropical cyclones, which can often result in a cyclone having two names. The Japan Meteorological Agency (JMA) will name a tropical ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tropical Cyclone
A tropical cyclone is a rapidly rotating storm system characterized by a low-pressure center, a closed low-level atmospheric circulation, strong winds, and a spiral arrangement of thunderstorms that produce heavy rain and squalls. Depending on its location and strength, a tropical cyclone is referred to by different names, including hurricane (), typhoon (), tropical storm, cyclonic storm, tropical depression, or simply cyclone. A hurricane is a strong tropical cyclone that occurs in the Atlantic Ocean or northeastern Pacific Ocean, and a typhoon occurs in the northwestern Pacific Ocean. In the Indian Ocean, South Pacific, or (rarely) South Atlantic, comparable storms are referred to simply as "tropical cyclones", and such storms in the Indian Ocean can also be called "severe cyclonic storms". "Tropical" refers to the geographical origin of these systems, which form almost exclusively over tropical seas. "Cyclone" refers to their winds moving in a circle, whirling round ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
South Atlantic Tropical Cyclone
South Atlantic tropical cyclones are unusual weather events that occur in the Southern Hemisphere. Strong wind shear, which disrupts the formation of cyclones, as well as a lack of weather disturbances favorable for development in the South Atlantic Ocean, make any strong tropical system extremely rare, and Hurricane Catarina in 2004 is the only recorded South Atlantic hurricane in history. Storms can develop year-round in the South Atlantic, with activity peaking during the months from November through May. Since 2011, the Brazilian Navy Hydrographic Center has assigned names to tropical and subtropical systems in the western side of the basin, near the eastern coast of Brazil, when they have sustained wind speeds of at least , the generally accepted minimum sustained wind speed for a disturbance to be designated as a tropical storm in the North Atlantic basin. Below is a list of notable South Atlantic tropical and subtropical cyclones. Theories concerning infrequency of occu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kármán Vortex Street
In fluid dynamics, a Kármán vortex street (or a von Kármán vortex street) is a repeating pattern of swirling vortices, caused by a process known as vortex shedding, which is responsible for the unsteady separation of flow of a fluid around blunt bodies. It is named after the engineer and fluid dynamicist Theodore von Kármán, and is responsible for such phenomena as the "singing" of suspended telephone or power lines and the vibration of a car antenna at certain speeds. Mathematical modeling of von Kármán vortex street can be performed using different techniques including but not limited to solving the full Navier-Stokes equations with k-epsilon, SST, k-omega and Reynolds stress, and large eddy simulation (LES) turbulence models, by numerically solving some dynamic equations such as the Ginzburg-Landau equation, or by use of a bicomplex variable. Analysis A vortex street will form only at a certain range of flow velocities, specified by a range of Reynolds numbe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cyclogenesis
Cyclogenesis is the development or strengthening of cyclonic circulation in the atmosphere (a low-pressure area). Cyclogenesis is an umbrella term for at least three different processes, all of which result in the development of some sort of cyclone, and at any size from the microscale to the synoptic scale. * Tropical cyclones form due to latent heat driven by significant thunderstorm activity, developing a warm core. * Extratropical cyclones form as waves along weather fronts before occluding later in their life cycle as cold core cyclones. * Mesocyclones form as warm core cyclones over land, and can lead to tornado formation. Waterspouts can also form from mesocyclones, but more often develop from environments of high instability and low vertical wind shear. The process in which an extratropical cyclone undergoes a rapid drop in atmospheric pressure (24 millibars or more) in a 24-hour period is referred to as explosive cyclogenesis, and is usually present during the formation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hurricane Lane (2018)
Hurricane Lane was a powerful tropical cyclone that brought torrential rainfall and strong winds to Hawaii during late August 2018. The storm was the wettest on record in Hawaii, with peak rainfall accumulations of 58 inches (1,473 mm) along the eastern slopes of Mauna Loa. The twelfth named storm, sixth hurricane, fourth major hurricane, and the first of three Category 5 hurricanes of the record-breaking 2018 Pacific hurricane season, Lane originated from an area of low pressure that formed well southwest of Mexico on August 13. Tracking west through a region of favorable atmospheric and oceanic conditions, the system steadily intensified over the following days. It reached an initial peak as a Category 4 hurricane on August 18. Temporarily inhibited by more hostile conditions, the hurricane weakened slightly before regaining strength and reaching Category 5 status on August 22 to the south of Hawaii. Lane peaked with winds of and a barometri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Subtropical Storm 96C
The 2018 Pacific hurricane season was one of the most active Pacific hurricane seasons on record, producing the highest accumulated cyclone energy value on record in the basin. The season had the fourth-highest number of named storms23, tied with 1982. The season also featured eight landfalls, six of which occurred in Mexico. The season officially began on May 15 in the Eastern Pacific, and on June 1 in the Central Pacific; they both ended on November 30. These dates conventionally delimit the period of each year when most tropical cyclones form in the Pacific basin. However, tropical cyclone formation is possible at any time of the year, as illustrated when the first tropical depression formed on May 10, five days prior to the official start of the season. The second named storm of the season, Hurricane Bud, struck Baja California Sur in mid-June, causing minor damage. Tropical Storm Carlotta stalled offshore of the Mexican coastline, where it also caused min ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hurricane Alex (2016)
Hurricane Alex was the first Atlantic hurricane to occur in January since Hurricane Alice of 1954–1955. Alex originated as a non-tropical low near the Bahamas on January 7, 2016. Initially traveling northeast, the system passed by Bermuda on January8 before turning southeast and deepening. It briefly acquired hurricane-force winds by January 10, then weakened slightly before curving towards the east and later northeast. Acquiring more tropical weather characteristics over time, the system transitioned into a subtropical cyclone well south of the Azores on January 12, becoming the first North Atlantic tropical or subtropical cyclone in January since Tropical Storm Zeta of 2005–2006. Alex continued to develop tropical features while turning north-northeast, and transitioned into a fully tropical cyclone on January 14. The cyclone peaked in strength as a Category1 hurricane on the Saffir–Simpson scale (SSHWS), with maximum sustained winds of 85mph (140km/h) and a central ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hurricane Sandy
Hurricane Sandy (unofficially referred to as ''Superstorm Sandy'') was an extremely destructive and strong Atlantic hurricane, as well as the largest Atlantic hurricane on record as measured by diameter, with tropical-storm-force winds spanning . The storm inflicted nearly $70 billion (2012 USD) in damage and killed 233 people across eight countries from the Caribbean to Canada. The eighteenth Tropical cyclone naming, named storm, tenth Atlantic hurricane, hurricane, and second major hurricane of the 2012 Atlantic hurricane season, Sandy was a List of Category 3 Atlantic hurricanes, Category 3 storm at its peak intensity when it made landfall in Cuba, though most of the damage it caused was after it became a Category 1-equivalent extratropical cyclone off the coast of the Northeastern United States. Sandy developed from a tropical wave in the western Caribbean Sea on October 22, quickly strengthened, and was upgraded to Tropical Storm Sandy six hours later. Sandy moved s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tropical Storm Omeka
Tropical Storm Omeka was the latest forming Eastern Pacific named storm since reliable records began in the 1960s. The storm was part of the 2010 Pacific typhoon and hurricane season. On December 18, 2010, the Central Pacific Hurricane Center (CPHC) began monitoring a subtropical cyclone near the International Dateline for possible tropical cyclogenesis. Over the following two days, the system tracked southwestward, entering the Western Pacific basin. It then began to transition into a tropical cyclone. Shortly before crossing the dateline on December 20, the CPHC assessed the system to have become a tropical storm. The storm was assigned the name Omeka several hours later as it moved into the CPHC's area of responsibility, which is from 140°W to the International Dateline. Upon doing so, Omeka attained its peak intensity with winds of 60 mph (100 km/h). Later on December 20, wind shear in the region increased, causing the system to weaken. By Dece ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2006 Central Pacific Cyclone
The 2006 Central Pacific cyclone, also known as Invest 91C or Storm 91C, was an unusual weather system that formed in 2006. Forming on October 30 from a mid-latitude cyclone in the north Pacific mid-latitudes, it moved over waters warmer than normal. The system acquired some features more typical of subtropical and even tropical cyclones. However, as it neared the western coastline of North America, the system fell apart, dissipating soon after landfall, on November 4. Moisture from the storm's remnants caused substantial rainfall in British Columbia and the Pacific Northwest. The exact status and nature of this weather event is unknown, with meteorologists and weather agencies having differing opinions. Meteorological history On October 28, 2006, a cut-off extratropical cyclone over the central north Pacific moved over an area of ocean with sea surface temperatures as high as 2 °C above normal, at , and stalled there for two days. By October 31, the system had acquired convectio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
