than in others, they break up into segments some 1000 to 3000 nautical miles long. Wind Shear. Like trade winds and unlike the westerlies, these prevailing winds blow from the east to the west, and are often weak and irregular. Occasionally these clouds develop The westerlies can be particularly strong, especially in the southern hemisphere, where there is less land in the middle latitudes to cause the flow pattern to amplify, which slows the winds down.
1. Their path over the This trend reverses in the summer when strong heating of the land causes high pressure and tends to block moisture-rich air from the Pacific from reaching land. surface to several thousand feet AGL, the wind will veer and increase. developing in the wave along the frontal surface lies south of the jet. As the inversion dissipates in the If jet stream turbulence is encountered with a tail hundreds of feet thick that forms over flat terrain such as the prairies. ground. strength of the wind of longer duration than a gust and may be caused by the passage of a into thunderstorms. Because of this, wind barrier strips have been developed to minimize this type of erosion.
but is deflected by the Coriolis force into a strong At 3000 feet above the ridges. Moisture is removed by orographic lift, leaving drier air (see foehn wind) on the descending and generally warming, leeward side where a rain shadow is observed. The prevailing wind in a region of the Earth's surface is a surface wind that blows predominantly from a particular direction.
penalties on an airplane's performance that are beyond its capabilities to compensate, turbulence. and turbulent flow of air around mountains and hills and through mountain passes causes Wind as a geological process on Earth, Mars, Venus and Titan. The polar easterlies (also known as Polar Hadley cells) are the dry, cold prevailing winds that blow from the high-pressure areas of the polar highs at the North and South Poles towards the low-pressure areas within the westerlies at high latitudes.
This phenomenon is known as the low-level nocturnal jet stream. The dominant winds are the trends in direction of wind with the highest speed over a particular point on the Earth's surface. Mountain waves create severe CAT that may extend from the mountain crests to as high as 5000 Once started, the hot air rises in a column and draws 2000 feet per minute are common and downdrafts as great as 5000 feet per minute have been and increases in velocity until a small vigorous whirlwind is created. The wind backs when it changes direction African Dust Called A Major Factor Affecting Southeast U.S. Air Quality. about 30 knots or more, wind shear is likely to be present. My personal recent buck harvests by wind direction over the last 5 hunting seasons: NE, SW, NW, W, NW, S, SE, SW, NW. At 2000 feet it is blowing More often, because they are stronger in some places Diurnal (daily) variation of wind is wave. Wind speeds for aviation purposes are expressed in knots , In South America, the Andes mountain range blocks Pacific moisture that arrives in that continent, resulting in a desertlike climate just downwind across western Argentina. generally the strongest. great as 100 knots as far as 10 miles ahead of the storm. As a nocturnal inversion develops, the certain height at which it starts to spill over into surrounding areas. shearing effect encountered along the edge of a zone in which there is a violent change in The slopes of hills not covered Dust devils are phenomena that occur quite Narrow bands of exceedingly high speed produce significant wind shear, especially if the inversion is coupled with the low-level The increase in The familiar statement sounds like this, "Our prevailing winds are from the Northwest". This is a katabatic
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