When high winds knock down or uproot trees, the process is known as windthrow. There are also strong evolutionary constraints on this dispersal mechanism. All other trademarks and copyrights are the property of their respective owners. [100] Horizontal-axle windmills were later used extensively in Northwestern Europe to grind flour beginning in the 1180s, and many Dutch windmills still exist. [136] Elk have a keen sense of smell that can detect potential upwind predators at a distance of 0.5 miles (800 m). force     Some outside influence that can change the motion of a body, hold bodies close to one another, or produce motion or stress in a stationary body. The most complex type of wind, it drives weather systems across the globe. Working Scholars® Bringing Tuition-Free College to the Community. The equator would also be hot as a furnace. This causes a pressure gradient of about 2 millibars from the ocean to the land. [166] At 70° S latitude on Neptune, a high-speed jet stream travels at a speed of 300 meters per second (670 mph). How does wind erosion create different features in deserts? All rights reserved. - Definition, Causes & The Enhanced Fujita Scale, What Are Cyclones? From December through February, the sun doesn’t reach the North Pole. Indeed, that’s why meteorologists refer to the jet stream’s position as a “storm track.”. 3.10). Fig. [167] The fastest wind on any known planet is on HD 80606 b located 190 light years away, where it blows at more than 11,000 mph or 5 km/s. In meteorology, winds are often referred to according to their strength, and the direction from which the wind is blowing. At a certain temperature, that hotter air begins to rise very quickly because a given volume of hot air is lighter than an equal volume of cooler air. Along peninsulas like Florida, colliding sea breezes can result in convergent winds. Hills and valleys substantially distort the airflow by increasing friction between the atmosphere and landmass by acting as a physical block to the flow, deflecting the wind parallel to the range just upstream of the topography, which is known as a barrier jet. To find the mass of the packet passing through an area A perpendicular its velocity (which could be the rotor area of a turbine), we multiply its volume after time t has passed with the air density ρ, which gives us m = A v t ρ. That’s why most of the air will leave a balloon whenever it gets a hole. In Java, the local name for such winds is koembang. Their cerci are very sensitive to the wind, and help them survive half of their attacks. Log in here for access. [109] Loess tends to develop into highly rich soils. Areas of wind shear caused by various weather phenomena can lead to dangerous situations for aircraft. jet stream     A fast-flowing, high-altitude air current. That afternoon, as the front retreated, over a span of just 27 minutes the temperature plummeted 32.2 degrees C (58 degrees F). The sea is warmed by the sun more slowly because of water's greater specific heat compared to land. Wind causes the generation of sound. These prevailing winds blow from the west to the east,[37][38] and steer extratropical cyclones in this general manner. [81] In Norse mythology, Njörðr is the god of the wind. These objects will produce sound if they touch each other. Together with the trade winds, the westerlies enabled a round-trip trade route for sailing ships crossing the Atlantic and Pacific Oceans, as the westerlies lead to the development of strong ocean currents on the western sides of oceans in both hemispheres through the process of western intensification. Zones of high (H) and low (L) pressure are labeled on this weather map. Wind powers the voyages of sailing ships across Earth's oceans. As described earlier, prevailing and local winds are not spread evenly across the earth, which means that wind speeds also differ by region. Surface friction also causes winds to blow more inward into low-pressure areas. [20] The terminology for tropical cyclones differs from one region to another globally. Directly under the subtropical ridge are the doldrums, or horse latitudes, where winds are lighter. tropics     The region near Earth’s equator. equator     An imaginary line around Earth that divides Earth into the Northern and Southern Hemispheres. [61]Wind power has expanded quickly, its share of worldwide electricity usage at the end of 2014 was 3.1%. credit by exam that is accepted by over 1,500 colleges and universities. This is because the air gets funneled into a smaller and smaller path. Ordinarily, air would flow from high pressure to low pressure. cloud     A plume of molecules or particles, such as water droplets, that move under the action of an outside force, such as wind, radiation or water currents. They’ve curved so much to the right that they often are speeding eastward at an impressive clip. When observing and analyzing ocean phenomenon, it is critical to consider wind in our measurements. And when this flow of cold air surges southward, it pushes the jet stream into southern Canada and the northern United States.

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