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Wind and moist air are drawn by the prevailing winds towards the top of the mountains, condensing and precipitating before it crosses the top. In an effect opposite that of orographic lift, the air, without much moisture left, advances behind the mountains, creating a drier side called the "rain shadow". [citation needed]
The cold prevailing northwesterly wind from Greece continuously blows over the northern coast without the interposition of an eventual mountain range and thus, greatly moderates temperatures throughout the year. Because of the effect, average low temperatures vary from 15 °C (59 °F) in wintertime to 27–35 °C (80.6–95.0 °F) in summertime ...
It forms above the mountain range, usually at the beginning of a chinook wind as a result of orographic lifting over the range. It appears when seen from downwind to form an arch over the mountain range. A layer of clear air separates it from the mountain. [3] A view of the Front Range of the Rockies capped by a föhn wall.
In general, Egypt is a very dry country. The Western Desert receives only occasional rainfall, the winters being mild and the summers very hot. The Eastern Desert receives some precipitation in the south in the form of orographic rainfall from winds that have crossed the Red Sea; this may cause torrential flows in the wadis. The winters here ...
Egypt is considered a downstream country because the source of the Nile, and most of the water that contributes to it, comes from outside Egypt’s borders. [25] The Nile flows 4,100 miles beginning in Lake Victoria (located between Uganda, Tanzania, and Kenya) and emptying into the Mediterranean sea forming the Nile Delta.
An orographic map of Eastern Siberia from 1875 by Peter Kropotkin. Orography is the study of the topographic relief of mountains, [1] and can more broadly include hills, and any part of a region's elevated terrain. [2] Orography (also known as oreography, orology, or oreology) falls within the broader discipline of geomorphology. [3]
Thundersnow is possible within a cyclone's comma head and within lake effect precipitation bands. In mountainous areas, heavy precipitation is possible where upslope flow is maximized within windward sides of the terrain at elevation. On the leeward side of mountains, desert climates can exist due to the dry air caused by compressional heating.
Effect of a rain shadow The Tibetan Plateau (center), perhaps the best example of a rain shadow. Rainfalls from the southern South Asian monsoon do not make it far past the Himalayas (seen by the snow line at the bottom), leading to an arid climate on the leeward (north) side of the mountain range and the desertification of the Tarim Basin (top).