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Olas en el Mar de Nubes By RevistaRAM Vídeo tomado "a intervalos" (timelapse) desde las cumbres que rodean el Parque Nacional de la Caldera de Taburiente, a 2400 m de altitud, en la Isla Canaria de La Palma, el 4 de septiembre de 2007. La velocidad a la que se reproducen las imágenes en el vídeo es 30 veces superior a la real. Se observa el característico "mar de nubes" de las Islas Canarias, con la presencia de unas sorprendentes "olas" que se desplazan sobre su superficie "rompiendo" contra las paredes que rodean la Caldera. Este vídeo fue publicado en la Revista del Aficionado a la Meteorología (http://www.meteored.com/ram) Más vídeos de nubes del autor tomados con esta técnica se encuentran disponibles en su canal de you tube (http://www.youtube.com/user/nambroque). Timelapse video taken from the tops of the 2400 meters high mountains around Caldera de Taburiente National Park, La Palma, Canary Islands, Spain. The speed of images in the movie is 30 times faster than real. The typical canarian "sea of clouds" is seen, with an amazing presence of "waves" on its surface moving towards the walls of Caldera, where they "break" This movie was published at the Spanish digital magazine Revista del Aficionado a la Meteorología (http://www.meteored.com/ram) More time lapse movies of clouds taken by the author are available at his channel in you tube (http://www.youtube.com/user/nambroque). Tags: clouds, mar, meteorology, meteorología, nubes, olas, sea, timelapse, waves 1 Downloads - Last from: http://downthisvideo.com/ (Your Blog here!) |
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Weather & Meteorology : How Do You Measure Rainfall? By eHow Rainfall is most commonly measured with a rain gauge, which can usually be found at an outdoor store or discount store. Discover why rain gauges need to be strategically placed in the open with help from a meteorologist in this free video on understanding weather. Expert: Charlie Neese Contact: www.charlieneese.com Bio: Charlie Neese is an Emmy Award-winning television meteorologist and severe weather safety expert based in Nashville, Tenn. Filmmaker: Dimitri LaBarge Tags: clouds, humidity, lightning, measurements, meteorologists, meteorology, precipitation, rainfall, snowfall, temperature, weather 1 Downloads - Last from: http://downthisvideo.com/ (Your Blog here!) |
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Weather & Meteorology : What Is Humidity? By eHow Humidity is a measure of moisture in the air, specifically that of water vapor, which is water in its gaseous state. Find out how to measure absolute humidity and how to determine the ratio of dry air to water vapor with help from a meteorologist in this free video on understanding weather. Expert: Charlie Neese Contact: www.charlieneese.com Bio: Charlie Neese is an Emmy Award-winning television meteorologist and severe weather safety expert based in Nashville, Tenn. Filmmaker: Dimitri LaBarge Tags: clouds, humidity, lightning, measurements, meteorologists, meteorology, precipitation, rainfall, snowfall, temperature, weather 2 Downloads - Last from: http://downthisvideo.com/ (Your Blog here!) |
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Meteorology Tutorial: Cyclones and Anticyclones By FutureMeteorologist Anticyclones are basically the opposite of cyclones (Greek prefix, anti, means opposite). Cyclones are areas of surface convergence and upper level divergence, and since anticyclones are the exact opposite, anticyclones are areas of surface divergence and upper level convergence. A cyclone is formed as a result of expanding, rising, and unstable air caused by heating. However as volume increases, the temperature decreases. According to Charles law, at a constant pressure, volume varies directly with absolute temperature. But still, why is it that when the volume increases, the expanding airs temperature decreases. According to the Kinetic theory, gas molecules are in constant random motion, and thus move hither and thither. Now in most cases, heat is energy, and when heat is added into a reaction, it often acts as a catalyst. Hence, the gas molecules move faster and take up more space as they move at higher velocities, increasing the volume. So now one liter of the air parcel would now occupy more space than it did previously. Moreover as the gas molecules move faster, they interact and bounce off each other more. As they bounce off each other, they transport some of that energy to each other, but some of that energy is also released in to the ambient air (Latent heat), causing a loss of energy. It is in a sense, semi-nuclear fusion phenomena. They then become cooler as they lose energy, and if the air contains ample water vapor, it would actually condense into clouds, cooling the surrounding area even further. This is why rain and cooler weather are often associated with low pressure systems. On the other hand, anticyclones formed as a result of contracting, sinking and stable air, caused by cooling or a relatively dry environment. Now because air molecules are more contracted in anticyclones, they have less space to move, and will actually hit each other more. This causes an increase in temperature, and because there were no external forces involved, the air warms adiabatically. For example if you use an air compressor, youll notice that the more you compress the air, the warmer it will become. This is why higher temperatures are often associated with regions of high pressure. In most cases, high pressure systems are what drive atmospheric phenomena such as heat waves. But depending on which side of the cyclone or anticyclone axis you are, the temperature may vary. For example if you are at the eastern side of an anticyclone in the northern hemisphere, the temperature will likely be cooler due to northerly winds; but the temperature would be warmer at the eastern side of a cyclone due to southerly winds. Cyclones and anticyclones work in a perpetual-unbreakable harmony; without anticyclones there would be no cyclones. Air flows from areas of higher pressure to low pressure, just as water can flow from the higher levels of a mountain to the bottom, or just as water in a sink flows from the surrounding regions to the sink hole—it is just another way nature maintain its equilibrium. As air flows away from an anticyclone to a cyclone, the air moves at a greater velocity as a near the center of the cyclone, just as a rock would roll faster as it nears the bottom of a hill, or just as water would flow faster as it nears the center of a whirlpool. However in the atmosphere the steepness of the air is known as the pressure gradient. Thus, the greater pressure difference between a cyclone and its surroundings; the greater the wind would be, likewise, the greater the steepness of a mountain; the greater the speed a rock could roll down. There are regions in the world where high pressure systems almost constant. They are the subtropical regions, and the Polar Regions. Sinking air from the Hadley cells usually cause anticyclogenesis in numerous parts of the subtropical areas, which is why the subtropical regions have major deserts such as the Kalahari, Sahara, etc. Sinking air from the semi-perpetual polar high usually does the same thing, and that is why the Polar Regions such as Antarctica barely receive any precipitation year round. The subtropical Atlantic is dominated by the Azores and Bermuda high. Because of their predominance, they cause major capping inversions, this region of the Atlantic receives little rainfall a year. Likewise, there are places in the world where low pressure systems are almost constant. Air converges at the intertropical convergence zone (ITCZ)* year round, causing copious precipitation. The polar front at approximately 60 degrees latitude is a baroclinic perpetual low pressure system that induces the formation of numerous mid-latitude cyclones in the temperate regions of the earth. The equatorial trough is basically the same thing as the ITCZ, but because the earth tilts, the location of the trough moves meridionally year round. Tags: 101, astrophysics, centrifugal, coriolis, cyc..., education, educational, effect, force, meteorology, physics, science, string, theory, tornado, vortex, weather 2 Downloads - Last from: http://downthisvideo.com/ (Your Blog here!) |
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Timelapse: El mar y la cascada de nubes/The sea & the falls of clouds (M: Equinoxe, J Michel Jarre) By nambroque Videos time-lapse a velocidad 120x en los que aparece el mar y/o la cascada de nubes en la isla de La Palma, Canarias. Más en http://videosdenubes.blogsp... Tags: clouds, de, mar, meteorology, meteorología, nubes, of, sea 2 Downloads - Last from: http://downthisvideo.com/ (Your Blog here!) |
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Meteorology Tutorial: Adiabatic Cooling and Warming Processes (HD) By FutureMeteorologist Unlike diabatic processes, no external heating or cooling is involved. The thermal changes are simply occurring within the air parcel. Now, how is this possible? Does the air parcel spontaneously increases or decreases its temperature. The answer is NO! Because energy cannot be created or destroyed. Atmospheric differences in pressure are what drive adiabatic cooling and warming processes. As you may already know, cold air sinks and warm air rises, due to the fact that warmer air is less dense and more buoyant than cooler air. Adiabatic cooling process....(rising air) For example: an air parcel at 1000mb is about 25C and the air at about 700mb is about 10c. Obviously, the air at the surface will rise because it is warmer. So, what is it that actually occurs within the air parcel that causes it rise?. Because the surface temperatures are higher than the temperatures at 700b, the air molecules within the air parcel will move faster. That is because heat is energy, and this means air molecules within the air parcel at 1000mb will have higher kinetic energy than the air parcel at above at 700mb. As the air molecules move faster, they will then acquire more space, and so 1 liter of air will now occupy less air molecules than it did previously, and the pressure within the parcel decreases as a result. The air molecules within the air parcel at the surface also clash and transfer energy with one another. Now, this causes the molecules to gradually lose their kinetic energy and since heat is energy, the molecules will start to cool down. Eventually, when the rising air parcel reaches 700mb, it will replace the 700mb stable air parcel. That air parcel will then start sinking Adiabatic Warming process (sinking air) The exact opposite happens when the air sinking..... High pressure systems warm the ambient air adiabatically, because the pressure is higher, which means that the air molecules are more contracted. Synoptic scale anticyclones often help bring much warmer and nicer weather after a cold front during the winter (depends on which side of the anticyclones you are located). Now, adiabatic processes are not strictly applied to atmospheric dynamics. An inflated air balloon or a deflating tire. For example, the air within a tire cools rapidly if you deflate, because it expands and cools adiabatically as it gushes out of the tire. Thanks for watching! Tags: ..., 101, education, flash, flood, footage, hail, high, incredible, intense, meteorologist, meteorology, severe, storm, tornado, tutorial, video, weather, winds 1 Downloads - Last from: (Your Blog here!) |
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