1.
Surface weather analysis
–
Surface weather analysis is a special type of weather map that provides a view of weather elements over a geographical area at a specified time based on information from ground-based weather stations. The first weather maps in the 19th century were drawn well after the fact to help devise a theory on storm systems, use of surface analyses began first in the United States, spreading worldwide during the 1870s. Use of the Norwegian cyclone model for frontal analysis began in the late 1910s across Europe, surface weather analyses have special symbols that show frontal systems, cloud cover, precipitation, or other important information. For example, an H may represent high pressure, implying clear skies, an L, on the other hand, may represent low pressure, which frequently accompanies precipitation. Various symbols are used not just for frontal zones and other surface boundaries on weather maps, areas of precipitation help determine the frontal type and location. The use of charts in a modern sense began in the middle portion of the 19th century in order to devise a theory on storm systems. The development of a network by 1845 made it possible to gather weather information from multiple distant locations quickly enough to preserve its value for real-time applications. The Smithsonian Institution developed its network of observers over much of the central, the U. S. Army Signal Corps inherited this network between 1870 and 1874 by an act of Congress, and expanded it to the west coast soon afterwards. The weather data was at first less useful as a result of the different times at which weather observations were made, the first attempts at time standardization took hold in Great Britain by 1855. The entire United States did not finally come under the influence of time zones until 1905, other countries followed the lead of the United States in taking simultaneous weather observations, starting in 1873. Other countries then began preparing surface analyses, the use of frontal zones on weather maps did not appear until the introduction of the Norwegian cyclone model in the late 1910s, despite Loomis earlier attempt at a similar notion in 1841. Since the leading edge of air mass changes bore resemblance to the fronts of World War I. The effort to automate map plotting began in the United States in 1969, hong Kong completed their process of automated surface plotting by 1987. In the United States, this development was achieved when Intergraph workstations were replaced by n-AWIPS workstations, recent advances in both the fields of meteorology and geographic information systems have made it possible to devise finely tailored weather maps. Weather information can quickly be matched to relevant geographical detail, for instance, icing conditions can be mapped onto the road network. This will likely continue to lead to changes in the way surface analyses are created and displayed over the several years. The pressureNET project is an attempt to gather surface pressure data using smartphones. When analyzing a weather map, a model is plotted at each point of observation
2.
Bar (unit)
–
The bar is a metric unit of pressure, but is not approved as part of the International System of Units. It is defined as equal to 100000 Pa, which is slightly less than the current average atmospheric pressure on Earth at sea level. The bar and the millibar were introduced by the Norwegian meteorologist Vilhelm Bjerknes, use of the bar is deprecated by some professional bodies in some fields. The International Astronomical Union also lists it under Non-SI units and symbols whose continued use is deprecated, as of 2004, the bar is legally recognized in countries of the European Union. Units derived from the bar include the megabar, kilobar, decibar, centibar, the notation bar, though deprecated by various bodies, represents gauge pressure, i. e. pressure in bars above ambient or atmospheric pressure. The bar is defined using the SI derived unit, pascal,1 bar ≡100000 Pa. Thus,1 bar is equal to,100 kPa 1×105 N/m21000000 Ba, notes,1 millibar =1 one-thousandth bar, or 1×10−3 bar 1 millibar =1 hectopascal. The word bar has its origin in the Greek word βάρος, the units official symbol is bar, the earlier symbol b is now deprecated and conflicts with the use of b denoting the unit barn, but it is still encountered, especially as mb to denote the millibar. Between 1793 and 1795, the bar was used for a unit of weight in an early version of the metric system. Atmospheric air pressure is given in millibars where standard sea level pressure is defined as 1013 mbar,101.3,1.013 bar. Despite the millibar not being an SI unit, meteorologists and weather reporters worldwide have long measured air pressure in millibars as the values are convenient, for example, the weather office of Environment Canada uses kilopascals and hectopascals on their weather maps. In contrast, Americans are familiar with the use of the millibar in US reports of hurricanes, in fresh water, there is an approximate numerical equivalence between the change in pressure in decibars and the change in depth from the water surface in metres. Specifically, an increase of 1 decibar occurs for every 1.019716 m increase in depth, in sea water with respect to the gravity variation, the latitude and the geopotential anomaly the pressure can be converted into meters depth according to an empirical formula. As a result, decibars are commonly used in oceanography, many engineers worldwide use the bar as a unit of pressure because, in much of their work, using pascals would involve using very large numbers. In the automotive field, turbocharger boost is often described in bars outside the USA), unicode has characters for mb and bar, but they exist only for compatibility with legacy Asian encodings and are not intended to be used in new documents. The kilobar, equivalent to 100 MPa, is used in geological systems. Bar and bara are sometimes used to indicate absolute pressures and bar and this usage is deprecated and fuller descriptions such as gauge pressure of 2 bar or 2 bar gauge are recommended.0 Unported License but not under the GFDL. Non-SI units accepted for use with the SI
3.
Pascal (unit)
–
The pascal is the SI derived unit of pressure used to quantify internal pressure, stress, Youngs modulus and ultimate tensile strength. It is defined as one newton per square meter and it is named after the French polymath Blaise Pascal. Common multiple units of the pascal are the hectopascal which is equal to one millibar, the unit of measurement called standard atmosphere is defined as 101,325 Pa and approximates to the average pressure at sea-level at the latitude 45° N. Meteorological reports typically state atmospheric pressure in hectopascals, the unit is named after Blaise Pascal, noted for his contributions to hydrodynamics and hydrostatics, and experiments with a barometer. The name pascal was adopted for the SI unit newton per square metre by the 14th General Conference on Weights, one pascal is the pressure exerted by a force of magnitude one newton perpendicularly upon an area of one square metre. The unit of measurement called atmosphere or standard atmosphere is 101325 Pa and this value is often used as a reference pressure and specified as such in some national and international standards, such as ISO2787, ISO2533 and ISO5024. In contrast, IUPAC recommends the use of 100 kPa as a standard pressure when reporting the properties of substances, geophysicists use the gigapascal in measuring or calculating tectonic stresses and pressures within the Earth. Medical elastography measures tissue stiffness non-invasively with ultrasound or magnetic resonance imaging, in materials science and engineering, the pascal measures the stiffness, tensile strength and compressive strength of materials. In engineering use, because the pascal represents a small quantity. The pascal is also equivalent to the SI unit of energy density and this applies not only to the thermodynamics of pressurised gases, but also to the energy density of electric, magnetic, and gravitational fields. In measurements of sound pressure, or loudness of sound, one pascal is equal to 94 decibels SPL, the quietest sound a human can hear, known as the threshold of hearing, is 0 dB SPL, or 20 µPa. The airtightness of buildings is measured at 50 Pa, the units of atmospheric pressure commonly used in meteorology were formerly the bar, which was close to the average air pressure on Earth, and the millibar. Since the introduction of SI units, meteorologists generally measure pressures in hectopascals unit, exceptions include Canada and Portugal, which use kilopascals. In many other fields of science, the SI is preferred, many countries also use the millibar or hectopascal to give aviation altimeter settings. In practically all fields, the kilopascal is used instead. Centimetre of water Metric prefix Orders of magnitude Pascals law
4.
United States dollar
–
The United States dollar is the official currency of the United States and its insular territories per the United States Constitution. It is divided into 100 smaller cent units, the circulating paper money consists of Federal Reserve Notes that are denominated in United States dollars. The U. S. dollar was originally commodity money of silver as enacted by the Coinage Act of 1792 which determined the dollar to be 371 4/16 grain pure or 416 grain standard silver, the currency most used in international transactions, it is the worlds primary reserve currency. Several countries use it as their currency, and in many others it is the de facto currency. Besides the United States, it is used as the sole currency in two British Overseas Territories in the Caribbean, the British Virgin Islands and Turks and Caicos Islands. A few countries use the Federal Reserve Notes for paper money, while the country mints its own coins, or also accepts U. S. coins that can be used as payment in U. S. dollars. After Nixon shock of 1971, USD became fiat currency, Article I, Section 8 of the U. S. Constitution provides that the Congress has the power To coin money, laws implementing this power are currently codified at 31 U. S. C. Section 5112 prescribes the forms in which the United States dollars should be issued and these coins are both designated in Section 5112 as legal tender in payment of debts. The Sacagawea dollar is one example of the copper alloy dollar, the pure silver dollar is known as the American Silver Eagle. Section 5112 also provides for the minting and issuance of other coins and these other coins are more fully described in Coins of the United States dollar. The Constitution provides that a regular Statement and Account of the Receipts and that provision of the Constitution is made specific by Section 331 of Title 31 of the United States Code. The sums of money reported in the Statements are currently being expressed in U. S. dollars, the U. S. dollar may therefore be described as the unit of account of the United States. The word dollar is one of the words in the first paragraph of Section 9 of Article I of the Constitution, there, dollars is a reference to the Spanish milled dollar, a coin that had a monetary value of 8 Spanish units of currency, or reales. In 1792 the U. S. Congress passed a Coinage Act, Section 20 of the act provided, That the money of account of the United States shall be expressed in dollars, or units. And that all accounts in the offices and all proceedings in the courts of the United States shall be kept and had in conformity to this regulation. In other words, this act designated the United States dollar as the unit of currency of the United States, unlike the Spanish milled dollar the U. S. dollar is based upon a decimal system of values. Both one-dollar coins and notes are produced today, although the form is significantly more common
5.
Lesser Antilles
–
The Lesser Antilles are a group of islands in the Caribbean Sea. Most form a long, partly volcanic island arc between the Greater Antilles to the north-west and the continent of South America, the islands form the eastern boundary of the Caribbean Sea with the Atlantic Ocean. Together, the Lesser Antilles and the Greater Antilles compose the Antilles, when combined with the Lucayan Archipelago, all three are known as the West Indies. The islands of the Lesser Antilles are divided into three groups, the Windward Islands in the south, the Leeward Islands in the north, and the Leeward Antilles in the west. The Windward Islands are so called because they were more windward to sailing ships arriving in the New World than the Leeward Islands, the trans-Atlantic currents and winds that provided the fastest route across the ocean brought these ships to the rough dividing line between the Windward and Leeward Islands. The Leeward Antilles consist of the Dutch ABC islands just off the coast of Venezuela, the Lesser Antilles more or less coincide with the outer edge of the Caribbean Plate. Many of the islands were formed as a result of the subduction of oceanic crust of the South American Plate under the Caribbean Plate in the Lesser Antilles subduction zone. This process is ongoing and is not only for many of the islands. The Lesser Antilles are divided into eight independent nations and numerous dependent, over one third of the total area and population of the Lesser Antilles lies within Trinidad and Tobago, a sovereign nation comprising the two southernmost islands of the Windward Island chain. Several islands along the north coast of Venezuela and politically part of country are also occasionally considered part of the Lesser Antilles. These are listed in the section below, the main Lesser Antilles are, Virgin Islands St. Thomas St. John St. They are the most southern islands of the Caribbean region, a Brief History of the Caribbean. New York, Facts on File,1992, the dictionary definition of Lesser Antilles at Wiktionary
6.
Jamaica
–
Jamaica is an island country situated in the Caribbean Sea, consisting of the third-largest island of the Greater Antilles. The island,10,990 square kilometres in area, lies about 145 kilometres south of Cuba, Jamaica is the fourth-largest island country in the Caribbean, by area. Inhabited by the indigenous Arawak and Taíno peoples, the island came under Spanish rule following the arrival of Christopher Columbus in 1494, Many of the indigenous people died of disease, and the Spanish imported African slaves as labourers. Named Santiago, the island remained a possession of Spain until 1655, under British colonial rule Jamaica became a leading sugar exporter, with its plantation economy highly dependent on slaves imported from Africa. The British fully emancipated all slaves in 1838, and many chose to have subsistence farms rather than to work on plantations. Beginning in the 1840s, the British imported Chinese and Indian indentured labour to work on plantations, the island achieved independence from the United Kingdom on 6 August 1962. With 2.8 million people, Jamaica is the third-most populous Anglophone country in the Americas, Kingston is the countrys capital and largest city, with a population of 937,700. Jamaicans predominately have African ancestry, with significant European, Chinese, Hakka, Indian, due to a high rate of emigration for work since the 1960s, Jamaica has a large diaspora around the world, particularly in Canada, the United Kingdom, and the United States. Jamaica is a Commonwealth realm, with Queen Elizabeth II as its monarch and her appointed representative in the country is the Governor-General of Jamaica, an office held by Sir Patrick Allen since 2009. Andrew Holness has served as the head of government and Prime Minister of Jamaica from March 2016, the indigenous people, the Taíno, called it Xaymaca in Arawakan, meaning the Land of Wood and Water or the Land of Springs. Colloquially Jamaicans refer to their island as the Rock. Slang names such as Jamrock, Jamdown, or briefly Ja, have derived from this, the Arawak and Taíno indigenous people, originating in South America, settled on the island between 4000 and 1000 BC. When Christopher Columbus arrived in 1494, there were more than 200 villages ruled by caciques, the south coast of Jamaica was the most populated, especially around the area now known as Old Harbour. The Taino still inhabited Jamaica when the English took control of the island in 1655, the Jamaican National Heritage Trust is attempting to locate and document any evidence of the Taino/Arawak. Christopher Columbus claimed Jamaica for Spain after landing there in 1494 and his probable landing point was Dry Harbour, now called Discovery Bay, although there is some debate that it might have been St. Anns Bay. St. Anns Bay was named Saint Gloria by Columbus, as the first sighting of the land, the capital was moved to Spanish Town, then called St. Jago de la Vega, around 1534. Spanish Town has the oldest cathedral of the British colonies in the Caribbean, the Spanish were forcibly evicted by the English at Ocho Rios in St. Ann. In 1655, the English, led by Sir William Penn and General Robert Venables, the English continued to import African slaves as labourers
7.
Cayman Islands
–
The Cayman Islands is a British Overseas Territory in the western Caribbean Sea. Its population is approximately 60,000, and its capital is George Town, the Cayman Islands are considered to be part of the geographic Western Caribbean Zone as well as the Greater Antilles. The territory is considered a major world offshore financial haven for many wealthy individuals. The Cayman Islands remained largely uninhabited until the 17th century, the first recorded permanent inhabitant of the Cayman Islands, Isaac Bodden, was born on Grand Cayman around 1661. He was the grandson of the original settler named Bodden who was one of Oliver Cromwells soldiers at the taking of Jamaica in 1655. England took formal control of the Cayman Islands, along with Jamaica, following several unsuccessful attempts at settlement, a permanent English-speaking population in the islands dates from the 1730s. With settlement, after the first royal land grant by the Governor of Jamaica in 1734, many were brought to the islands from Africa, this is evident today with the majority of native Caymanians being of African and English descent. The results of the first census taken in the islands in 1802 showed the population on Grand Cayman to be 933 with 545 of those inhabitants being enslaved, slavery was abolished in the Cayman Islands in 1833. At the time of abolition, there were over 950 Blacks of African ancestry enslaved by 116 white families of English ancestry. The islands continued to be governed as part of the Colony of Jamaica until 1962, the Cayman Islands historically have been a tax-exempt destination. On 8 February 1794, the Caymanians rescued the crews of a group of ten merchant ships, including HMS Convert, the ships had struck a reef and run aground during rough seas. Legend has it that King George III rewarded the island with a never to introduce taxes as compensation for their generosity. While this remains a legend, the story is not true. However, whatever the history, in practice the government of the Cayman Islands has always relied on indirect, the islands have never levied income tax, capital gains tax, or any wealth tax, making them a popular tax haven. On 11 September 2004 the island of Grand Cayman, which lies largely unprotected at sea level, was hit by Hurricane Ivan, an estimated 83% of the dwellings on the island were damaged including 4% requiring complete reconstruction. A reported 70% of all dwellings suffered severe damage from flooding or wind, another 26% sustained minor damage from partial roof removal, low levels of flooding, or impact with floating or wind driven hurricane debris. Power, water and communications were disrupted for months in areas as Ivan was the worst hurricane to hit the islands in 86 years. Grand Cayman began a rebuilding process and within two years its infrastructure was nearly returned to pre-hurricane status.23 years
8.
Mexico
–
Mexico, officially the United Mexican States, is a federal republic in the southern half of North America. It is bordered to the north by the United States, to the south and west by the Pacific Ocean, to the southeast by Guatemala, Belize, and the Caribbean Sea, and to the east by the Gulf of Mexico. Covering almost two million square kilometers, Mexico is the sixth largest country in the Americas by total area, Mexico is a federation comprising 31 states and a federal district that is also its capital and most populous city. Other metropolises include Guadalajara, Monterrey, Puebla, Toluca, Tijuana, pre-Columbian Mexico was home to many advanced Mesoamerican civilizations, such as the Olmec, Toltec, Teotihuacan, Zapotec, Maya and Aztec before first contact with Europeans. In 1521, the Spanish Empire conquered and colonized the territory from its base in Mexico-Tenochtitlan, Three centuries later, this territory became Mexico following recognition in 1821 after the colonys Mexican War of Independence. The tumultuous post-independence period was characterized by instability and many political changes. The Mexican–American War led to the cession of the extensive northern borderlands, one-third of its territory. The Pastry War, the Franco-Mexican War, a civil war, the dictatorship was overthrown in the Mexican Revolution of 1910, which culminated with the promulgation of the 1917 Constitution and the emergence of the countrys current political system. Mexico has the fifteenth largest nominal GDP and the eleventh largest by purchasing power parity, the Mexican economy is strongly linked to those of its North American Free Trade Agreement partners, especially the United States. Mexico was the first Latin American member of the Organisation for Economic Co-operation and Development and it is classified as an upper-middle income country by the World Bank and a newly industrialized country by several analysts. By 2050, Mexico could become the fifth or seventh largest economy. The country is considered both a power and middle power, and is often identified as an emerging global power. Due to its culture and history, Mexico ranks first in the Americas. Mexico is a country, ranking fourth in the world by biodiversity. In 2015 it was the 9th most visited country in the world, Mexico is a member of the United Nations, the World Trade Organization, the G8+5, the G20, the Uniting for Consensus and the Pacific Alliance. Mēxihco is the Nahuatl term for the heartland of the Aztec Empire, namely, the Valley of Mexico, and its people, the Mexica and this became the future State of Mexico as a division of New Spain prior to independence. It is generally considered to be a toponym for the valley became the primary ethnonym for the Aztec Triple Alliance as a result. After New Spain won independence from Spain, representatives decided to name the new country after its capital and this was founded in 1524 on top of the ancient Mexica capital of Mexico-Tenochtitlan
