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:
74-545: Libredón was a forest, sometimes also described as a mountain, near Santiago de Compostela that according to legend, is where the body of Saint James was laid to rest. There is a belief that the forest was located at the Oak grove of Santa Susana [ gl ] , a hill in Santiago de Compostela that is part of the Parque da Alameda de Santiago de Compostela . The legend surrounding
148-525: A Renfe rail service. Santiago de Compostela Airport is the 2nd busiest airport in northern Spain after Bilbao Airport . The airport is located in the parish of Lavacolla, 12 km from the city center and handled 2,903,427 passengers in 2019. Santiago de Compostela railway station is linked to the Spanish High Speed Railway Network . Madrid is reached in 3 hours. Porto can also be reached in less than 5 hours changing to
222-403: A Sunday. Outside of Holy Years, the city still receives a remarkable number of pilgrims. In 2013, 215,880 people completed the pilgrimage. In 2014, there were 237,983 persons. In 2015, there were 262,513 persons and in 2016, there were 277,854 persons. Editorial Compostela owns daily newspaper El Correo Gallego , a local TV, and a radio station. Galician-language online news portal Galicia Hoxe
296-481: A chapel on the site. Traditionally, it is believed that the location of the forest is where the Oak grove of Santa Susana [ gl ] is located, a hill in Santiago de Compostela that is part of the Parque da Alameda de Santiago de Compostela [ gl ] , between Paseo da Alameda [ gl ] and Paseo da Ferradura [ gl ] . Santiago de Compostela Santiago de Compostela , simply Santiago , or Compostela , in
370-612: A convective low acquires a well-hot circulation in the tropics it is termed a tropical cyclone . Tropical cyclones can form during any month of the year globally but can occur in either the northern or southern hemisphere during December. Atmospheric lift will also generally produce cloud cover through adiabatic cooling once the air temperature drops below the dew point as it rises, the cloudy skies typical of low-pressure areas act to dampen diurnal temperature extremes . Since clouds reflect sunlight , incoming shortwave solar radiation decreases, which causes lower temperatures during
444-413: A depth of at least 50 m (160 ft); waters of this temperature cause the overlying atmosphere to be unstable enough to sustain convection and thunderstorms. Another factor is rapid cooling with height, which allows the release of the heat of condensation that powers a tropical cyclone. High humidity is needed, especially in the lower-to-mid troposphere ; when there is a great deal of moisture in
518-649: A kingdom and Alfonso II as king, and had also crafted close political and ecclesiastic ties. Around the place of the discovery a new settlement and centre of pilgrimage emerged, which was known to the author Usuard in 865 and which was called Compostella by the 10th century. The devotion to Saint James of Compostela was just one of many arising throughout northern Iberia during the 10th and 11th centuries, as rulers encouraged their own region-specific devotions, such as Saint Eulalia in Oviedo and Saint Aemilian in Castile. After
592-403: A mix of middle-aged residents and younger students maintain a lively presence until the early hours of the morning. Radiating from the centre of the city, the historic cathedral is surrounded by paved granite streets, tucked away in the old town, and separated from the newer part of the city by the largest of many parks throughout the city, Parque da Alameda . Santiago gives its name to one of
666-578: A pair of oxen she allegedly had by the Pico Sacro , a local sacred mountain where a dragon dwelt, hoping that the dragon would kill the Christians, but as soon as the beast attacked the disciples, at the sight of the cross, the dragon exploded. Then the disciples marched to collect the oxen, which were actually wild bulls which the queen used to punish her enemies; but again, at the sight of the Christian's cross,
740-514: A pilgrims' hospice (now a Parador ). The Obradoiro façade of the cathedral, the best known, is depicted on the Spanish euro coins of 1 cent, 2 cents, and 5 cents (€0.01, €0.02, and €0.05). Santiago is the site of the University of Santiago de Compostela , established in the early 16th century. The main campus can be seen best from an alcove in the large municipal park in the centre of the city. Within
814-563: A small chapel with an altar and a crypt (the Aca Marmarica [ gl ] ) in which there were three tombs, that of Santiago and that of his two disciples. He informed the king of Galicia, Alfonso the Chaste , who traveled from Oviedo along what is called the Camino Primitivo , to verify that the bones corresponded to those of the apostle. King Alfonso II ordered the construction of
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#1732851665482888-542: A very mild climate for its latitude with heavy winter rainfall courtesy of its relative proximity to the prevailing winds from Atlantic low-pressure systems . According to Richard Fletcher scholars now agree that the origin of the name Compostela comes from the Latin compositum tella , meaning a well-ordered burial ground, possibly referring to an ancient burial ground on the site of the Church of Santiago de Compostela that pre-dates
962-515: Is a storm that occurs in the Atlantic Ocean and northeastern Pacific Ocean , a typhoon occurs in the northwestern Pacific Ocean, and a tropical cyclone occurs in the south Pacific or Indian Ocean . Friction with land slows down the wind flowing into low-pressure systems and causes wind to flow more inward, or flowing more ageostrophically , toward their centers. Tornadoes are often too small, and of too short duration, to be influenced by
1036-448: Is also based in the city. Televisión de Galicia , the public broadcaster corporation of Galicia, has its headquarters in Santiago. During medieval times, the Santiago de Compostela pilgrimage emerged as one of the most significant Christian journeys in Europe, attracting thousands of pilgrims seeking spiritual redemption and fulfillment. Believed to be the final resting place of Saint James
1110-554: Is an umbrella term for several different processes, all of which result in the development of some sort of cyclone . Meteorologists use the term "cyclone" where circular pressure systems flow in the direction of the Earth's rotation, which normally coincides with areas of low pressure. The largest low-pressure systems are cold-core polar cyclones and extratropical cyclones which lie on the synoptic scale . Warm-core cyclones such as tropical cyclones, mesocyclones , and polar lows lie within
1184-545: Is becoming increasingly diversified. New industries such as timber transformation (FINSA), the automotive industry ( UROVESA ), and telecommunications and electronics (Blusens and Televés) have been established. Banco Gallego, a banking institution owned by Novacaixagalicia , has its headquarters in downtown rúa do Hórreo . Tourism is very important thanks to the Way of St. James , particularly in Holy Compostelan Years (when
1258-524: Is characterized by the development of lower air pressure over the warmest part of the various continents. The large-scale thermal lows over continents help create pressure gradients which drive monsoon circulations. In the southern hemisphere, the monsoon trough associated with the Australian monsoon reaches its most southerly latitude in February, oriented along a west-northwest/east-southeast axis. Many of
1332-499: Is governed by a mayor–council form of government . Following the 2023 Spanish local elections the mayor of Santiago is Goretti Sanmartín , of BNG . The population of the city in 2019 was 96,260 inhabitants, while the metropolitan area reaches 178,695. In 2010 there were 4,111 foreigners living in the city, representing 4.3% of the total population. The main nationalities are Brazilians (11%), Portuguese (8%) and Colombians (7%). By language, according to 2008 data, 21.17% of
1406-416: Is initially accelerated from areas of high pressure to areas of low pressure. This is due to density (or temperature and moisture) differences between two air masses . Since stronger high-pressure systems contain cooler or drier air, the air mass is denser and flows towards areas that are warm or moist, which are in the vicinity of low-pressure areas in advance of their associated cold fronts . The stronger
1480-481: Is set in the historic part of Santiago de Compostela. A pilgrimage to Santiago de Compostela provides the narrative framework of the Luis Buñuel film La Voie lactée (The Milky Way) . A mystic pilgrimage was portrayed in the autobiography and romance The Pilgrimage ("O Diário de um Mago") of Brazilian writer Paulo Coelho , published in 1987. Santiago de Compostela is served by Santiago de Compostela Airport and
1554-573: The Atlantic and the surrounding mountains combine to give Santiago some of Spain's highest rainfall: about 1,800 millimetres (70.9 in) annually. The winters are mild, despite being far inland and at an altitude of 370 metres (1,210 ft) frosts are only common in December, January and February, with an average of just 13 days per year. Snow is uncommon, with 2-3 snowy days per year. Temperatures above 35 °C (95 °F) are very exceptional. The city
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#17328516654821628-491: The British Isles and Netherlands ), recurring low-pressure weather systems are typically known as "low levels". Cyclogenesis is the development and strengthening of cyclonic circulations, or low-pressure areas, within the atmosphere. Cyclogenesis is the opposite of cyclolysis , and has an anticyclonic (high-pressure system) equivalent which deals with the formation of high-pressure areas — anticyclogenesis . Cyclogenesis
1702-749: The Celta train in Vigo . On 24 July 2013 there was a serious rail accident near the city in which 79 people died and at least 130 were injured when a train derailed on a bend as it approached Compostela station. Santiago de Compostela is twinned with: [REDACTED] This article incorporates text from a publication now in the public domain : Chisholm, Hugh , ed. (1911). " Santiago de Compostela ". Encyclopædia Britannica . Vol. 24 (11th ed.). Cambridge University Press. pp. 191–192. Low-pressure system Diverging winds aloft, ahead of these troughs, cause atmospheric lift within
1776-580: The Earth 's surface. Large-scale thermal lows over continents help drive monsoon circulations. Low-pressure areas can also form due to organized thunderstorm activity over warm water. When this occurs over the tropics in concert with the Intertropical Convergence Zone , it is known as a monsoon trough . Monsoon troughs reach their northerly extent in August and their southerly extent in February. When
1850-571: The Feast of Saint James falls on a Sunday). Following the Xunta's considerable investment and hugely successful advertising campaign for the Holy Year of 1993, the number of pilgrims completing the route has been steadily rising. More than 272,000 pilgrims made the trip during the course of the Holy Year of 2010. Following 2010, the next Holy Year will not be for another 11 years when St James feast day again falls on
1924-558: The Hadley cell circulation. Monsoon troughing in the western Pacific reaches its zenith in latitude during the late summer when the wintertime surface ridge in the opposite hemisphere is the strongest. It can reach as far as the 40th parallel in East Asia during August and 20th parallel in Australia during February. Its poleward progression is accelerated by the onset of the summer monsoon which
1998-506: The Holy Land after preaching in Galicia. There he was beheaded, but his disciples got his body to Jaffa , where they found a marvelous stone ship which miraculously conducted them and the apostle's body to Iria Flavia , back in Galicia. There, the disciples asked the local pagan queen Loba ('She-wolf') for permission to bury the body; she, annoyed, decided to deceive them, sending them to pick
2072-575: The Iberian Peninsula and had preached there is one of a number of early traditions concerning the missionary activities and final resting places of the apostles of Jesus. Although the 1884 Bull of Pope Leo XIII Omnipotens Deus accepted the authenticity of the relics at Compostela, the Vatican remains uncommitted as to whether the relics are those of Saint James the Greater , while continuing to promote
2146-722: The Southern Hemisphere shows that between the 30th and 70th parallels there are an average of 37 cyclones in existence during any 6-hour period. A separate study in the Northern Hemisphere suggests that approximately 234 significant extratropical cyclones form each winter. In Europe, particularly in the United Kingdom and in the Netherlands, recurring extratropical low-pressure weather systems are typically known as depressions. These tend to bring wet weather throughout
2220-471: The troposphere below as air flows upwards away from the surface, which lowers surface pressures as this upward motion partially counteracts the force of gravity packing the air close to the ground. Thermal lows form due to localized heating caused by greater solar incidence over deserts and other land masses. Since localized areas of warm air are less dense than their surroundings, this warmer air rises, which lowers atmospheric pressure near that portion of
2294-483: The Apostle, the pilgrimage route traversed many countries and scenic locations. The pilgrimage not only fostered spiritual growth but also facilitated cultural exchange, as towns along the route thrived with the influx of visitors, leading to the construction of churches, and further development of the towns. This sacred journey symbolized a profound devotion to faith, enduring trials, and the hope of divine grace. A symbol of
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2368-557: The Camino de Santiago, is one of the world's most significant and historical Christian pilgrimages. This sacred journey leads to the Cathedral of Santiago de Compostela in the Galicia region of northwest Spain, where the remains of Saint James the Apostle are believed to be buried. The pilgrimage dates back to the Middle Ages and continues to draw thousands of pilgrims annually from all corners of
2442-506: The Christian building. Santiago is the local Galician evolution of Vulgar Latin Sanctus Iacobus "Saint James ". According to folk etymology Compostela derives from the Latin : Campus Stellae ('field of the star'). According to a medieval legend, the remains of the apostle James, son of Zebedee were brought to Galicia for burial, where they were lost. Eight hundred years later
2516-526: The Pilgrimage is the scallop shell, as seen in a sculpture, depicted below, in Santo Domingo de Silos, in which Jesus is shown as a pilgrim with a satchel that is embroidered with the scallop shell. The Scallop shell comes from a legend about St. James’s arrival: he frightened a horse, scaring it into the sea, and the horse reemerged with the shell covering itself. Santiago de Compostela’s pilgrimage, known as
2590-705: The atmosphere, conditions are more favorable for disturbances to develop. Low amounts of wind shear are needed, as high shear is disruptive to the storm's circulation. Lastly, a formative tropical cyclone needs a pre-existing system of disturbed weather, although without a circulation no cyclonic development will take place. 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 . In deserts , lack of ground and plant moisture that would normally provide evaporative cooling can lead to intense, rapid solar heating of
2664-475: The bishopric of Iria was incorporated into the Kingdom of Asturias c. 750 . At some point between 818 and 842, during the reign of Alfonso II of Asturias , bishop Theodemar of Iria (d. 847) claimed to have found some remains which were attributed to Saint James the Greater . This discovery was accepted in part because Pope Leo III and Charlemagne —who had died in 814—had acknowledged Asturias as
2738-474: The bulls calmed down, and after being subjected to a yoke they carried the apostle's body to the place where now Compostela is. The legend was again referred with minor changes by the Czech traveller Jaroslav Lev of Rožmitál , in the 15th century. The relics were said to have been later rediscovered in the 9th century by a hermit named Pelagius, who after observing strange lights in a local forest went for help after
2812-521: The cathedral, namely Fernando II and Alfonso IX , last of the Kings of León and Galicia before both kingdoms were united with the Kingdom of Castile . During this same 10th century and in the first years of the 11th century Viking raiders tried to assault the town —Galicia is known in the Nordic sagas as Jackobsland or Gallizaland —and bishop Sisenand II, who was killed in battle against them in 968, ordered
2886-528: The centre Saint James riding a white horse and wearing a white cloak, sword in hand: The legend of the miraculous armed intervention of Saint James, disguised as a white knight to help the Christians when battling the Muslims, was a recurrent myth during the High Middle Ages. As the lowest-lying land on that stretch of coast, the city's site took on added significance. Legends supposed of Celtic origin made it
2960-520: The centre of Asturian political power moved from Oviedo to León in 910, Compostela became more politically relevant, and several kings of Galicia and of León were acclaimed by the Galician noblemen and crowned and anointed by the local bishop at the cathedral, among them Ordoño IV in 958, Bermudo II in 982, and Alfonso VII in 1111, by which time Compostela had become capital of the Kingdom of Galicia . Later, 12th-century kings were also sepulchered in
3034-565: The city—who fought for self-government—against the local bishop, the secular and jurisdictional lord of the city and of its fief, the semi-independent Terra de Santiago ("land of Saint James"). The culminating moment in this confrontation was reached in the 14th century, when the new prelate, the Frenchman Bérenger de Landore , treacherously executed the counselors of the city in his castle of A Rocha Forte ("the strong rock, castle"), after inviting them for talks. Santiago de Compostela
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3108-461: The construction of a walled fortress to protect the sacred place. In 997 Compostela was assaulted and partially destroyed by Ibn Abi Aamir (known as al-Mansur), Andalusian leader accompanied in his raid by Christian lords, who all received a share of the booty. However, the Andalusian commander showed no interest in the alleged relics of St James. In response to these challenges bishop Cresconio , in
3182-451: The course of the following century a main Catholic shrine second only to Rome and Jerusalem . In the 12th century, under the impulse of bishop Diego Gelmírez , Compostela became an archbishopric, attracting a large and multinational population. Under the rule of this prelate , the townspeople rebelled, headed by the local council, beginning a secular tradition of confrontation by the people of
3256-538: The day. At night the absorptive effect of clouds on outgoing longwave radiation , such as heat energy from the surface, allows for warmer night-time minimums in all seasons. The stronger the area of low pressure, the stronger the winds experienced in its vicinity. Globally, low-pressure systems are most frequently located over the Tibetan Plateau and in the lee of the Rocky Mountains . In Europe (particularly in
3330-405: The difference between temperatures aloft and sea surface temperatures is the greatest. However, each particular basin has its own seasonal patterns. On a worldwide scale, May is the least active month while September is the most active month. Nearly one-third of the world's tropical cyclones form within the western Pacific Ocean, making it the most active tropical cyclone basin on Earth . Wind
3404-508: The disciples of Saint James, as they moved his body from Padrón in a cart pulled by oxen to the Libredón forest (previously Liberum Donum), where he was buried. The journey is also described in stories involving Queen Lupa . The place was forgotten until, in the 9th century, Pelagius the Hermit saw some lights that illuminated the forest. He advised Theodemir , bishop of Iria Flavia . They found
3478-657: The flow around Rossby waves migrate equatorward of the polar cyclones located in both the Northern and Southern hemispheres. All share one important aspect, that of upward vertical motion within the troposphere. Such upward motions decrease the mass of local atmospheric columns of air, which lowers surface pressure. Extratropical cyclones form as waves along weather fronts due to a passing by shortwave aloft or upper-level jet streak before occluding later in their life cycle as cold-core cyclones. Polar lows are small-scale, short-lived atmospheric low-pressure systems that occur over
3552-486: The four military orders of Spain: Santiago , Calatrava , Alcántara and Montesa . One of the most important economic centres in Galicia, Santiago is the seat for organisations like Association for Equal and Fair Trade Pangaea . Under the Köppen climate classification , Santiago de Compostela has a temperate oceanic climate ( Cfb ) with mild to warm and somewhat dry summers and mild, wet winters. The prevailing winds from
3626-567: The globe. Participants embark on various routes, the most popular being the Camino Francés, traversing hundreds of kilometers on foot, by bicycle, or even on horseback. The journey is not just a physical challenge but also a profound spiritual and introspective experience, offering a sense of community, personal reflection, and fulfillment. Along the way, pilgrims pass through diverse landscapes and historic towns and encounter symbols of faith and support. The legend that St. James found his way to
3700-606: The growth and development of the city. Along the western side of the Praza do Obradoiro is the elegant 18th-century Pazo de Raxoi, now the city hall. Across the square is the Pazo de Raxoi (Raxoi's Palace), the town hall, and on the right from the cathedral steps is the Hostal dos Reis Católicos , founded in 1492 by the Catholic Monarchs , Isabella of Castille and Ferdinand II of Aragon , as
3774-565: The initial collapse of the Roman Empire . The area was later attributed to the bishopric of Iria Flavia in the 6th century, in the partition usually known as Parochiale Suevorum, ordered by King Theodemar . In 585, the settlement was annexed along with the rest of Suebi Kingdom by Leovigild as the sixth province of the Visigothic Kingdom . Possibly raided from 711 to 739 by the Arabs ,
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#17328516654823848-545: The land cools off quickly, but the ocean keeps the heat longer due to its higher specific heat. The hot air over the ocean rises, creating a low-pressure area and a breeze from land to ocean while a large area of drying high pressure is formed over the land, increased by wintertime cooling. Monsoons resemble sea and land breezes , terms usually referring to the localized, diurnal (daily) cycle of circulation near coastlines everywhere, but they are much larger in scale - also stronger and seasonal. Large polar cyclones help determine
3922-403: The land, bringing the moist near-surface air over the oceans with it. Similar rainfall is caused by the moist ocean-air being lifted upwards by mountains , surface heating, convergence at the surface, divergence aloft, or from storm-produced outflows at the surface. However the lifting occurs, the air cools due to expansion in lower pressure, which in turn produces condensation . In winter,
3996-604: The life of the apostle says that Saint James preached the gospel in Hispania as well as in the Holy Land ; after returning to Israel he was martyred at the orders of Herod Agrippa . His disciples carried his body by sea to Hispania, where they landed at Padrón on the coast of Galicia . In 1139, in Book III: Transfer of the body to Santiago in the Codex Calixtinus , describes the journey of Theodore and Athanasius ,
4070-434: The light of a bright star guided a shepherd, Pelagius the Hermit , who was watching his flock at night to the burial site in Santiago de Compostela. This site was originally called Mount Libredon [ gl ] and its physical topography leads prevalent seaborne winds to clear the cloud deck immediately overhead. The shepherd quickly reported his discovery to the bishop of Iria, Theodemir . The bishop declared that
4144-419: The local bishop, Theodemar of Iria , in the west of Galicia. The legend affirms that Theodemar was then guided to the spot by a star, drawing upon a familiar myth-element, hence "Compostela" was given an etymology as a corruption of Campus Stellae, "Field of Stars." In the 15th century, the red banner which guided the Galician armies to battle, was still preserved in the Cathedral of Santiago de Compostela, in
4218-407: The lower layers of air. The hot air is less dense than surrounding cooler air. This, combined with the rising of the hot air, results in a low-pressure area called a thermal low . Monsoon circulations are caused by thermal lows which form over large areas of land and their strength is driven by how land heats more quickly than the surrounding nearby ocean. This generates a steady wind blowing toward
4292-448: The mid-11th century, fortified the entire town, building walls and defensive towers. According to some authors, by the middle years of the 11th century the site had already become a pan-European "place of peregrination", while others maintain that the devotion to Saint James was before 11-12th centuries an essentially Galician affair, supported by Asturian and Leonese kings to win over faltering Galician loyalties. Santiago would become in
4366-636: The more general benefits of pilgrimage to the site. Pope Benedict XVI undertook a ceremonial pilgrimage to the site on his visit to Spain in 2010. The 1,000-year-old pilgrimage to the shrine of St. James in the Santiago de Compostela Cathedral is known in English as the Way of St. James and in Spanish as the Camino de Santiago . Over 200,000 pilgrims travel to the city each year from points all over Europe and other parts of
4440-423: The northern hemisphere (as the wind moves inward and is deflected right from the center of high pressure) and clockwise circulation in the southern hemisphere (as the wind moves inward and is deflected left from the center of high pressure). A tropical cyclone differs from a hurricane or typhoon based only on geographic location. A tropical cyclone is fundamentally different from a mid-latitude cyclone. A hurricane
4514-722: The ocean areas poleward of the main polar front in both the Northern and Southern Hemispheres. They are part of the larger class of mesoscale weather-systems. Polar lows can be difficult to detect using conventional weather reports and are a hazard to high-latitude operations, such as shipping and offshore platforms . They are vigorous systems that have near-surface winds of at least 17 metres per second (38 mph). Tropical cyclones form due to latent heat driven by significant thunderstorm activity, and are warm-core with well-defined circulations. Certain criteria need to be met for their formation. In most situations, water temperatures of at least 26.5 °C (79.7 °F) are needed down to
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#17328516654824588-521: The old town there are many narrow winding streets full of historic buildings. The new town all around it has less character though some of the older parts of the new town have some big flats in them. Santiago de Compostela has a substantial nightlife. Both in the new town ( a zona nova in Galician , la zona nueva in Spanish or ensanche ) and the old town ( Galician : a zona vella , Spanish : la zona vieja , trade-branded as zona monumental ),
4662-730: The place where the souls of the dead gathered to follow the sun across the sea. Those unworthy of going to the Land of the Dead haunted Galicia as the Santa Compaña or Estadea . Santiago de Compostela is featured prominently in the 1988 historical fiction novel Sharpe's Rifles , by Bernard Cornwell , which takes place during the French Invasion of Galicia, January 1809, during the Napoleonic Wars. The music video for Una Cerveza , by Ráfaga ,
4736-513: The population always speak in Galician , 15% always speak in Spanish, 31% mostly in Galician and the 32.17% mostly in Spanish. According to a Xunta de Galicia 2010 study the 38.5% of the city primary and secondary education students had Galician as their mother tongue . The area of Santiago de Compostela was a Roman cemetery by the 4th century and was occupied by the Suebi in the early 5th century, when they settled in Galicia and Portugal during
4810-414: The pressure difference, or pressure gradient , between a high-pressure system and a low-pressure system, the stronger the wind. Thus, stronger areas of low pressure are associated with stronger winds. The Coriolis force caused by the Earth 's rotation is what gives winds around low-pressure areas (such as in hurricanes , cyclones , and typhoons ) their counter-clockwise (anticlockwise) circulation in
4884-536: The province of A Coruña , is the capital of the autonomous community of Galicia , in northwestern Spain . The city has its origin in the shrine of Saint James the Great , now the Cathedral of Santiago de Compostela , as the destination of the Way of St. James , a leading Catholic pilgrimage route since the 9th century. In 1985, the city's Old Town was designated a UNESCO World Heritage Site . Santiago de Compostela has
4958-509: The remains were those of the apostle James and immediately notified King Alfonso II in Oviedo . To honour St. James, the cathedral was built on the spot where his remains were said to have been found. The legend , which included numerous miraculous events, enabled the Catholic faithful to bolster support for their stronghold in northern Spain during the Christian crusades against the Moors, but also led to
5032-399: The smaller mesoscale . Subtropical cyclones are of intermediate size. Cyclogenesis can occur at various scales, from the microscale to the synoptic scale. Larger-scale troughs, also called Rossby waves, are synoptic in scale. Shortwave troughs embedded within the flow around larger scale troughs are smaller in scale, or mesoscale in nature. Both Rossby waves and shortwaves embedded within
5106-565: The steering of systems moving through the mid-latitudes, south of the Arctic and north of the Antarctic . The Arctic oscillation provides an index used to gauge the magnitude of this effect in the Northern Hemisphere. Extratropical cyclones tend to form east of climatological trough positions aloft near the east coast of continents, or west side of oceans. A study of extratropical cyclones in
5180-415: The world's rainforests are associated with these climatological low-pressure systems. Tropical cyclones generally need to form more than 555 km (345 mi) or poleward of the 5th parallel north and 5th parallel south , allowing the Coriolis effect to deflect winds blowing towards the low-pressure center and creating a circulation. Worldwide, tropical cyclone activity peaks in late summer, when
5254-429: The world. The pilgrimage has been the subject of many books, television programmes, and films, notably Brian Sewell 's The Naked Pilgrim produced for the British television channel Channel 5 and the Martin Sheen / Emilio Estevez collaboration The Way . According to a tradition that can be traced back at least to the 12th century, when it was recorded in the Codex Calixtinus , Saint James decided to return to
5328-692: The year. Thermal lows also occur during the summer over continental areas across the subtropics - such as the Sonoran Desert , the Mexican Plateau , the Sahara , South America , and Southeast Asia. The lows are most commonly located over the Tibetan Plateau and in the lee of the Rocky Mountains. Elongated areas of low pressure form at the monsoon trough or Intertropical Convergence Zone as part of
5402-570: Was captured and sacked by the French during the Napoleonic Wars ; as a result, the remains attributed to the apostle were lost for near a century, hidden inside a cist in the crypts of the cathedral of the city. The excavations conducted in the cathedral during the 19th and 20th centuries uncovered a Roman cella memoriae or martyrium , around which grew a small cemetery in Roman and Suevi times which
5476-406: Was later abandoned. This martyrium , which proves the existence of an old Christian holy place , has been sometimes attributed to Priscillian , although without further proof. Santiago's economy, although still heavily dependent on public administration (i.e. being the headquarters of the autonomous government of Galicia), cultural tourism, industry, and higher education through its university ,
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