Saint Martin is a tropical island in the northeast Caribbean, approximately 300 km southeast of Puerto Rico. The 87 km² island is divided roughly in half between France and the Netherlands; it is the smallest inhabited sea island divided between two nations.
The main towns are Marigot (on the French part) and Philipsburg in the Dutch one.
About 60.000 people live on the island.
Antigua
Antigua (IPA: /ænˈtiːgə//an-tee-gah) is an island in the West Indies, Leeward Islands in the Caribbean region, the main island of the country of Antigua and Barbuda. It is also known as Wadadli, which means approximately "our own". The island's circumference is about 87 kilometres (54 miles) and it has an area of 281 km² (108 square miles). It has a population of about 69,000 people as of July 2006. It is the largest of the Leeward Islands, and has a busy economy based on tourism, internet gambling, and education, including two medical schools.
Indigenous peoples like the Ciboney, Taíno, and Kalinago had lived on and around the island for a long time. But in 1493, Christopher Columbus became the first European to visit, and he renamed it Antigua after Mary, the mother of Jesus. The British came in 1632 and colonized the island. They brought slaves to the island from Africa who were forced to grow sugar cane. The slaves were legally freed in 1834.
The island stopped being a part of Britain in 1981. It is now a country with Barbuda.
Tropical Storm Melissa (2007)
Tropical Storm Melissa was the thirteenth named storm of the 2007 Atlantic hurricane season. It was a short-lived storm that formed southwest of the Cape Verde islands, remaining weak because of high wind shear. It dissipated without affecting any land areas. It was only notable for being the eighth named storm of September 2007, which tied the record for the month of September.
The system began as a tropical wave that moved off the west coast of Africa on September 26. An area of low pressure formed on September 27 near Cape Verde in association with the wave, and convection slowly increased as a result of the low. Early on September 28, a rapid increase in convection and a well-organized outflow pattern allowed the low to develop into Tropical Depression Fourteen while about 115 miles (185 km) west-southwest of the southernmost Cape Verde Islands. Since the depression was far removed from the subtropical ridge and an upper-level low pressure area was sitting to the north, steering currents were weak at first and the depression moved very slowly on a general west-northwest track. Vertical wind shear from the west also slowed down development. Small amounts of strengthening took place early on September 29 as convection increased in the system, and the depression was upgraded to Tropical Storm Melissa.
Like previous storms Ingrid and Karen, high wind shear in the deep tropics delayed Melissa's development. Operationally, Melissa was briefly upgraded to 45 mph (75 km/h) late on September 29 as some satellite estimates showed a slightly stronger storm with deeper convection, but Melissa was found to have been weaker in the post-storm analysis, remaining at 40 mph (65 km/h). By early on September 30, wind shear began to severely increase and a weakening trend began. That morning, the increased shear, combined with cooler sea surface temperatures, weakened Melissa to a tropical depression with a poorly-defined surface center as it continued to move west-northwest at a somewhat faster speed. The system lost its deep convection and by the afternoon of September 30, Melissa degenerated into a remnant low as thunderstorm activity decreased. After the circulation dissipated, the remnant low continued its general west-northwest track south of a rebuilding subtropical ridge in the central Atlantic. The low produced discontinuous amounts convection until it was absorbed by a frontal zone late on October 5 northeast of the Leeward Islands.
Melissa remained away from land during its lifespan, never threatening any land areas. There were no ship reports of tropical storm-force winds as a result of Melissa. No damage or deaths were reported.
When Tropical Depression Fourteen was upgraded to Tropical Storm Melissa on September 29, it was the eighth named storm to form in the month of September. That tied a record for the month of September, which was first set in the 2002 season.
71 (number)
Seventy-one is a number. It comes between seventy and seventy-two, and is an odd number. It is also a prime number.
Neso (moon)
Neso also known as Neptune XIII, is the farthest non-spherical moon of Neptune. It was found by Matthew J. Holman, Brett J. Gladman, "et al." on August 14, 2002, though it went unnoticed until 2003.
Neso orbits Neptune at a distance of more than 48 million km, making it the farthest known moon of any planet.
It follows a very inclined and very eccentric orbit illustrated on the diagram in relation to other irregular satellites of Neptune.
Neso is about 60 km in diameter, and assuming the mean density of 1.5 g/cm. Its mass is estimated at 1.6 kg.
Given the similarity of the orbit's parameters with Psamathe (S/2003 N 1), it was suggested that both non-spherical moons could have been a bigger moon that broke up.
Neso is named after one of the Nereids. Before the announcement of its name on February 3, 2007 (IAUC 8802), Neso was known by its designation S/2002 N 4.
Weather front
A weather front is a boundary in between two masses of air of different densities, and is the main cause of significant weather. In surface weather analyses, fronts are depicted using various colored lines and symbols. The air masses separated by a front usually differ in temperature and humidity.
Cold fronts may feature narrow bands of thunderstorms and severe weather, and may on occasion be preceded by squall lines or dry lines. Warm fronts are usually preceded by layered precipitation and fog. The weather usually quickly clears after a front passes. Some fronts produce no precipitation and little cloudiness, although there is usually a wind shift.
Subtropical ridge
The subtropical ridge is a large belt of high pressure around 30ºN in the Northern Hemisphere and 30ºS in the Southern Hemisphere. It is characterized by mostly calm winds. Air flows out from its center toward the upper and lower latitudes of each hemisphere, creating both the trade winds and the westerlies.
Vorticity
Vorticity is a mathematical concept used in fluid dynamics. It can be related to the amount of "circulation" or "rotation" (or more strictly, the local angular rate of rotation) in a fluid.
The average vorticity in a small region of fluid flow is equal to the circulation formula_1 around the boundary of the small region, divided by the area A of the small region.
Notionally, the vorticity at a point in a fluid is the limit as the area of the small region of fluid approaches zero at the point:
Mathematically, the vorticity at a point is a vector and is defined as the curl of the velocity:
One of the base assumptions of the potential flow assumption is that the vorticity formula_5 is zero almost everywhere, except in a boundary layer or a stream-surface immediately bounding a boundary layer.
Because a vortex is a region of concentrated vorticity, the non-zero vorticity in these specific regions can be modelled with vortices.
Barbuda
Barbuda is an island in the eastern Caribbean, and forms part of the state of Antigua and Barbuda. It has a population of about 1,500, most of whom live in the town of Codrington.
Barbuda is located north of Antigua, in the middle of the Leeward Islands. To the south are the islands of Montserrat and Guadaloupe, and to the north and west are Nevis, St. Kitts, St. Barts, and St. Martin.
Émile Durkheim