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Cyclone Nadia
Intense Tropical Cyclone Nadia was a powerful tropical cyclone that struck both Madagascar and Mozambique in March 1994. It formed on 16 March and moved westward for the first ten days of its duration. Warm waters and low wind shear allowed for the storm to gradually strengthen. After developing a well-defined eye (cyclone), eye, Nadia intensified to reach winds of 175 km/h (110 mph (10 minute sustained)) early on 22 March, according to Météo-France (MF). In contrast, the Joint Typhoon Warning Center (JTWC) estimated winds of about 220 km/h (140 mph 1 minute sustained). On 23 March, the cyclone struck northern Madagascar, causing flooding and localized damage where it moved ashore. There were 12 deaths in the country. Nadia emerged into the Mozambique Channel as a weakened storm, although it reintensified slightly before making landfall in northeastern Mozambique on 24 March. The storm turned southward through the country, emerging over water o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Madagascar
Madagascar (; mg, Madagasikara, ), officially the Republic of Madagascar ( mg, Repoblikan'i Madagasikara, links=no, ; french: République de Madagascar), is an island country in the Indian Ocean, approximately off the coast of East Africa across the Mozambique Channel. At Madagascar is the world's List of island countries, second-largest island country, after Indonesia. The nation is home to around 30 million inhabitants and consists of the island of Geography of Madagascar, Madagascar (the List of islands by area, fourth-largest island in the world), along with numerous smaller peripheral islands. Following the prehistoric breakup of the supercontinent Gondwana, Madagascar split from the Indian subcontinent around 90 million years ago, allowing native plants and animals to evolve in relative isolation. Consequently, Madagascar is a biodiversity hotspot; over 90% of wildlife of Madagascar, its wildlife is endemic. Human settlement of Madagascar occurred during or befo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rainband
A rainband is a cloud and precipitation structure associated with an area of rainfall which is significantly elongated. Rainbands can be stratiform or convective, and are generated by differences in temperature. When noted on weather radar imagery, this precipitation elongation is referred to as banded structure. Rainbands within tropical cyclones are curved in orientation. Rainbands of tropical cyclones contain showers and thunderstorms that, together with the eyewall and the eye, constitute a hurricane or tropical storm. The extent of rainbands around a tropical cyclone can help determine the cyclone's intensity. Rainbands spawned near and ahead of cold fronts can be squall lines which are able to produce tornadoes. Rainbands associated with cold fronts can be warped by mountain barriers perpendicular to the front's orientation due to the formation of a low-level barrier jet. Bands of thunderstorms can form with sea breeze and land breeze boundaries, if enough moisture ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zambezi
The Zambezi River (also spelled Zambeze and Zambesi) is the fourth-longest river in Africa, the longest east-flowing river in Africa and the largest flowing into the Indian Ocean from Africa. Its drainage basin covers , slightly less than half of the Nile's. The river rises in Zambia and flows through eastern Angola, along the north-eastern border of Namibia and the northern border of Botswana, then along the border between Zambia and Zimbabwe to Mozambique, where it crosses the country to empty into the Indian Ocean. The Zambezi's most noted feature is Victoria Falls. Its other falls include the Chavuma Falls at the border between Zambia and Angola, and Ngonye Falls near Sioma in western Zambia. The two main sources of hydroelectric power on the river are the Kariba Dam, which provides power to Zambia and Zimbabwe, and the Cahora Bassa Dam in Mozambique, which provides power to Mozambique and South Africa. Additionally, two smaller power stations are along the Zambezi Riv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Convection (meteorology)
Atmospheric convection is the result of a parcel-environment instability, or temperature difference layer in the atmosphere. Different lapse rates within dry and moist air masses lead to instability. Mixing of air during the day which expands the height of the planetary boundary layer leads to increased winds, cumulus cloud development, and decreased surface dew points. Moist convection leads to thunderstorm development, which is often responsible for severe weather throughout the world. Special threats from thunderstorms include hail, downbursts, and tornadoes. Overview There are a few general archetypes of atmospheric instability that are used to explain convection (or lack thereof). A necessary (but not sufficient) condition for convection is that the environmental lapse rate (the rate of decrease of temperature with height) is steeper than the lapse rate experienced by a rising parcel of air. When this condition is met, upward-displaced air parcels can become buoyant an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atmospheric Circulation
Atmospheric circulation is the large-scale movement of air and together with ocean circulation is the means by which thermal energy is redistributed on the surface of the Earth. The Earth's atmospheric circulation varies from year to year, but the large-scale structure of its circulation remains fairly constant. The smaller scale weather systems – mid-latitude depressions, or tropical convective cells – occur chaotically, and long-range weather predictions of those cannot be made beyond ten days in practice, or a month in theory (see chaos theory and the butterfly effect). The Earth's weather is a consequence of its illumination by the Sun and the laws of thermodynamics. The atmospheric circulation can be viewed as a heat engine driven by the Sun's energy and whose energy sink, ultimately, is the blackness of space. The work produced by that engine causes the motion of the masses of air, and in that process it redistributes the energy absorbed by the Earth's surface near ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Island Of Mozambique
The Island of Mozambique ( pt, Ilha de Moçambique) lies off northern Mozambique, between the Mozambique Channel and Mossuril Bay, and is part of Nampula Province. Prior to 1898, it was the capital of colonial Portuguese East Africa. With its rich history and sandy beaches, the Island of Mozambique is a UNESCO World Heritage site and one of Mozambique's fastest-growing tourist destinations. It has a permanent population of approximately 14,000 people and is served by nearby Lumbo Airport on the Nampula mainland. The name of the country, Mozambique, is derived from the name of this island. History Pottery found on Mozambique Island indicates that the town was founded no later than the fourteenth century. According to tradition, the original Swahili population came from Kilwa. The town's rulers had links with the rulers of both Angoche and Quelimane by the fifteenth century. In 1514, Duarte Barbosa noted that the town had a Muslim population and that they spoke the same Swahili d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nacala
Nacala, also known as Cidade de Nacala or Nacala-Porto is a city on the northern coast of Mozambique. Located in the southwestern indentation of inner Fernao Veloso Bay, it is the deepest natural port on the east coast of Africa. Nacala serves as the terminal for the Nacala railway, a rail line to the landlocked Malawi. South of Nacala is Mozambique Island, at one time the capital of Mozambique and now a World Heritage site. History Nacala was founded as a little town and developed as a deep waters port and an industrial, agricultural and exporting centre during the last period of the Portuguese rule of the territory which ended in the mid-1970s. Among its major industries were cement, sisal and cashew. Other important employers were the seaport, its small modern hospital, and services (banking, insurance and administration). Industry Nacala is site of one of three cement works in Mozambique. Transport Nacala is the terminal of the Nacala railway that connects to the Centra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mayotte
Mayotte (; french: Mayotte, ; Shimaore: ''Maore'', ; Kibushi: ''Maori'', ), officially the Department of Mayotte (french: Département de Mayotte), is an overseas department and region and single territorial collectivity of France. It is located in the northern part of the Mozambique Channel in the Indian Ocean off the coast of Southeastern Africa, between Northwestern Madagascar and Northeastern Mozambique. Mayotte consists of a main island, Grande-Terre (or Maore), a smaller island, Petite-Terre (or Pamanzi), as well as several islets around these two. Mayotte is the most prosperous territory in the Mozambique Channel, making it a major destination for immigration. Mayotte's land area is and, with its 299,348 people according to January 2022 official estimates, is very densely populated at 800 inhabitants per km2 (2,073 per sq mi). The biggest city and prefecture is Mamoudzou on Grande-Terre. The Dzaoudzi–Pamandzi International Airport is located on the neighbouring is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vohemar
Vohemar ( mg, Vohimarina or ''Iharan̈a'' ) is a coastal city and commune ( mg, firaisana) in northern Madagascar. It belongs to the district of Iharana, which is a part of Sava Region. The population of the commune was estimated to be approximately 15,000 in 2001 commune census. In addition to primary schooling the town offers secondary education at both junior and senior levels. The town provides access to hospital services to its citizens. From the late medieval period, Northern Madagascar had a number of small and large trading towns ruled by Swahili merchants. Vohemar, one such town, was likely founded around the 13th Century as a Swahili trading port.Newitt, Malyn. "The Comoro Islands in Indian Ocean Trade before the 19th Century." Cahiers d'Études Africaines, Vol. 23, Cahier 89/90 (1983), Page 143 Farming and raising livestock provides employment for 20% and 5% of the working population. The most important crop is cassava, while other important products are peanut, m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coordinated Universal Time
Coordinated Universal Time or UTC is the primary time standard by which the world regulates clocks and time. It is within about one second of mean solar time (such as UT1) at 0° longitude (at the IERS Reference Meridian as the currently used prime meridian) and is not adjusted for daylight saving time. It is effectively a successor to Greenwich Mean Time (GMT). The coordination of time and frequency transmissions around the world began on 1 January 1960. UTC was first officially adopted as CCIR Recommendation 374, ''Standard-Frequency and Time-Signal Emissions'', in 1963, but the official abbreviation of UTC and the official English name of Coordinated Universal Time (along with the French equivalent) were not adopted until 1967. The system has been adjusted several times, including a brief period during which the time-coordination radio signals broadcast both UTC and "Stepped Atomic Time (SAT)" before a new UTC was adopted in 1970 and implemented in 1972. This change also a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Outflow (meteorology)
Outflow, in meteorology, is air that flows outwards from a storm system. It is associated with ridging, or anticyclonic flow. In the low levels of the troposphere, outflow radiates from thunderstorms in the form of a wedge of rain-cooled air, which is visible as a thin rope-like cloud on weather satellite imagery or a fine line on weather radar imagery. For observers on the ground, a thunderstorm outflow boundary often approaches in otherwise clear skies as a low, thick cloud that brings with it a gust front. Low-level outflow boundaries can disrupt the center of small tropical cyclones. However, outflow aloft is essential for the strengthening of a tropical cyclone. If this outflow is restricted or undercut, the tropical cyclone weakens. If two tropical cyclones are in close proximity, the upper-level outflow from the upwind system can limit the development of the other system. Thunderstorms For thunderstorms, outflow tends to indicate the development of a system. Large quan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Maximum Sustained Wind
The maximum sustained wind associated with a tropical cyclone is a common indicator of the intensity of the storm. Within a mature tropical cyclone, it is found within the eyewall at a distance defined as the radius of maximum wind, or RMW. Unlike gusts, the value of these winds are determined via their sampling and averaging the sampled results over a period of time. Wind measuring has been standardized globally to reflect the winds at above the Earth's surface, and the maximum sustained wind represents the highest average wind over either a one-minute (US) or ten-minute time span (see the definition, below), anywhere within the tropical cyclone. Surface winds are highly variable due to friction between the atmosphere and the Earth's surface, as well as near hills and mountains over land. Over the ocean, satellite imagery determines the value of the maximum sustained winds within a tropical cyclone. Land, ship, aircraft reconnaissance observations, and radar imagery can ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
