When the air goes down the other side, it gets warmer, holds water and does not rain A rain shadow is an area of land that lies behind a mountain which gets almost no rainfall. CEO Compensation and America's Growing Economic Divide. Find out information about Rain shadow effect. n. An area having relatively little precipitation due to the effect of a barrier, such as a mountain range, that causes the prevailing winds to lose their moisture before reaching it. This dry wind gets over to the other part of the hill, which gets even warmer. On reaching land, moisture-laden air can sometimes travel hundreds, or even thousands, of miles across relatively flat country, depositing its moisture as it goes. This occurs as warm moist air is lifted upwards the sides of a mountain by prevailing winds that bring rain to mountains. The Rain Shadow Effect is the "2nd half" of the Orographic Effect. The Santa Cruz Mountains also have that effect over the San Jose region of California. The first "half" occurs when prevailing air currents bring moist air masses into contact with linear mountain ranges. The Glossary of Meteorology website defines a rain shadow as “A region of sharply reduced precipitation on the lee side of an orographic barrier, as compared with regions upwind of the barrier” (http://glossary.ametsoc.org/wiki/Rain_shadow). Image by Youth Delegates. Causes of Rain Shadow: As the prevailing winds over the waterbodies when getting on to the land surface, the wind rises, cools and condenses to rain over the hill. Define rain shadow. You may redistribute it, verbatim or modified, providing that you comply with the terms of the CC-BY-SA. The mountains block the passage of rain-producing weather systems and cast a "shadow" of dryness behind them. A rain shadow requires that there be moisture and also that winds move consistently in one direction, so that the topography offers a constant protective element. A ‘rain shadow’ is the dry area on the leeward side (the side away from the wind) on a mountainous area. Micro-algae and biologically-derived chemicals are better manufactured in the year-round solar radiation environment of the deserts. Rain Shadows - dry areas on downwind sides of mountains - are prominent on the Big Island of Hawaii and east of the Cascade Range in the Pacific Northwest. Desert dust particles that are swept up into the global atmosphere offer some significant minerals to oceanic phytoplankton that need the phosphorus and silicon they contain to grow. In South America, the Atacama Desert, Mendoza region, and Valle Central in Chile, the experiencing of a rain shadow effect therein is due to the presences of the Andes Mountains. The rain shadow effect occurs as warm, moist air rises against high elevations of land and drops its water along the way. Rain shadows affect the patterns of much needed rain and moisture in mountains, that in turn replenish and encourage growth to new forests and old growth forests situated in its biome. Five lessons to teach RAIN SHADOW (from super simple and cheap to exhibit quality). rain shadow. The Olympic Mountain Range of Washington State, directly south, block the warm … rain shadow n. An area having relatively little precipitation due to the effect of a barrier, such as a mountain range, that causes the prevailing winds to lose their moisture before reaching it. When high terrain and climate interact, a rain shadow always seems to affect a region. Honduras Fish Rain – Does It Really Rain Fish? In the United States of America, Utah and Nevada have a rain shadow effect due to the Cascade Mountains of Oregon. The rain shadow effect is where precipitation amounts drop significantly on the leeward side of a mountain. As it does so, the air expands and becomes less dense. A rain shadow is a dry area on the leeward side of a mountainous area (away from the wind). The rain shadow effect all over the world. These winds are called the "trade winds", and are located at 30° North and 30° South latitudes. This effectively shuts off the rain because the air can better hold the remaining moisture. Rain Shadow Educational diagram with windward and leeward side. ZIMSEC O Level Geography Notes: Rain Shadow Effect. This occurs as warm moist air is lifted upwards the sides of a mountain by prevailing winds that bring rain to mountains. On one side of the mountain, wet weather systems drop rain and snow. As a result of the removal of moisture, the area becomes a dry region devoid of further precipitation by the action of the warm, moist air. When Hurricane Fran crossed from North Carolina through the Virginias into Ohio, the mountains squeezed the clouds on the eastern side of the Blue Ridge and a second time at the Allegheny Front. Deserts' mild nighttime temperatures act as catalysts for aquaculture. The air, without much moisture left, advances across the mountains creating a drier side called the "rain shadow". Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. The bigger mountain chains like the Cascades and Rockies really play a major role because of how tall they can be. See more. This phenomenon is the result of the warm moist air that rises accompanied by prevailing winds at the tops of mountains. B) The shadows cast on the Earth from rain clouds. rain shadow synonyms, rain shadow pronunciation, rain shadow translation, English dictionary definition of rain shadow. This creates a region on the far side of the mountain range that is relatively deficient in precipitation to the point of forming a rain-shadow desert. 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