Downslope Winds occur when warm/dry air descends rapidly down a mountain side. These are common on the east side of the Rocky Mountains, called Chinook Winds. … This creates dry winds that flow east to west through the mountain passages in Southern California.
What is downslope flow?
Downslope Flow A thermally driven wind directed down a mountain slope and usually occurring at night; part of the along-slope wind system.
What causes upslope winds?
Upslope Winds. Diurnal mountain winds are produced by horizontal temperatures differences that develop daily in complex terrain. Surface heating will cause the air nearer the slope to be warmed more than air farther from the surface. … As the warm air rises, it results in an upward flow of air, causing an upslope wind.
What does Downsloping mean in weather?
Downsloping is the process that occurs when a stream of air is forced to descend a mountain. As the air descends, it undergoes a series of changes that result in a warming/drying effect.Does cooling cause downslope winds?
katabatic wind, also called downslope wind, or gravity wind, wind that blows down a slope because of gravity. It occurs at night, when the highlands radiate heat and are cooled.
What is the downslope movement of soil and rock due to gravity?
Mass movement is an erosional process that moves rocks and sediments downslope due to the force of gravity. The material is transported from higher elevations to lower elevations where other transporting agents like streams or glaciers can pick it up and move to even lower elevations.
What are prevailing winds?
Prevailing winds are winds that blow consistently in a given direction over a particular region on Earth. Due to factors such as uneven heating from the Sun and the Earth’s rotation, these winds vary at different latitudes on Earth.
Why do rocks and soil move downslope?
Mass wasting – is movement in which bed rock, rock debris, or soil moves downslope in bulk, or as a mass, because of the pull of gravity. Landslides is a general term for the slow-to-very rapid descent of rock or soil.What type of material dominates the downslope movement of a debris flow?
What type of material dominates the downslope movement of a debris flow? Boulders and gravel in mud.
What is an upslope storm?The term “upslope storm” is used to describe a winter storm that occurs along the eastern slopes of the Rocky Mountains and on the Plains directly east of the mountains. ❑ These storms occur with low-level winds that have an easterly component.
Article first time published onWhat is snow Downsloping?
Downsloping: The process of drying out the atmosphere by squeezing out moisture over mountains. When moist air gets pushed over mountains, the moisture gets squeezed out and areas downwind of the mountains are left with dry air.
Where do katabatic winds occur?
Katabatic winds are most commonly found blowing out from the large and elevated ice sheets of Antarctica and Greenland. The buildup of high density cold air over the ice sheets and the elevation of the ice sheets brings into play enormous gravitational energy.
Where are upslope winds common?
An upslope wind occurs on the windward side of a mountain range. Some mountain ranges, such as the Sierra Nevadas in California have the west side of the mountain range as the windward side the great percentage of the time.
What winds occur downslope predominantly in the evening or night?
This oscillatory motion forms a series of lesser waves downstream until the oscillation finally ceases. Waves may extend as high as 40,000 feet or more in the well-known Bishop wave in California. Large-scale waves occur in the Rocky Mountains, and waves on a lesser scale appear in the Appalachians and elsewhere.
Can also be described as an upslope wind?
anabatic wind, also called upslope wind, local air current that blows up a hill or mountain slope facing the Sun. During the day, the Sun heats such a slope (and the air over it) faster than it does the adjacent atmosphere over a valley or a plain at the same altitude.
What is the name for a downslope wind that undergoes compressional warming in the Rocky Mountains?
Chinook winds can be as much as 50 degrees Fahrenheit (10 decrees Celsius) warmer than the air they displace, according to Indiana Public Media’s Moment of Science. Temperatures rise approximately 5.5 degrees F per every thousand feet the air mass descends down the mountain.
Why is Antarctica so windy?
Why is Antarctica so windy? The strong winds are the result of katabatic winds (from the Greek word katabasis, meaning – going down) which arise when cold, dense air lying less than a few hundred metres off the surface at the highest levels of the Antarctic ice sheets flows down towards the coast under gravity.
What are Santa Ana winds?
The Santa Ana winds are a cool season wind that blows from the desert, raising dust, fanning fires and, according to popular literature at least, making people crazy and homicidal. Santa Anas are always dry, a result of subsidence from their place of origin over the higher elevation Great Basin of Nevada and Utah.
What are the 3 prevailing winds?
There are three prevailing wind belts associated with these cells: the trade winds, the prevailing westerlies, and the polar easterlies (Fig. 3.10).
What are the prevailing winds in the Philippines?
- Northeast (NE) monsoon – from November to February.
- Southwest (SW) monsoon – from July to September.
- Trade winds – winds in the tropics. They generally come from the east. The trade winds prevail during the rest of the year whenever NE monsoons are weak.
Is the downslope movement of rock regolith and soil under the direct influence of gravity?
Mass wasting refers to the downslope movement of rock, regolith, and soil under the direct influence of gravity. In the evolution of most landforms, mass wasting is the step that follows weathering. … Mass wasting is not confined to land; it also occurs underwater.
What is the process of transporting weathered material?
Erosion is the physical removal and transportation of weathered material by water, wind, ice, or gravity. Mass wasting is the transfer or movement of rock or soil down slope primarily by gravity.
What is the downslope movement of unconsolidated material on a curved slip surface?
A slump is a downward and outward movement of rock or unconsolidated material moving as a unit or series of units. Large blocks of material move suddenly downward and outward along a curved plane. Rockslides are the most catastrophic type of landslide.
What is the term used to describe the downslope movement of earth materials due to gravity?
mass movement, also called Mass Wasting, bulk movements of soil and rock debris down slopes in response to the pull of gravity, or the rapid or gradual sinking of the Earth’s ground surface in a predominantly vertical direction.
Which of the following pertains to a sudden slide of rocks downslope?
Landslides are sudden falls of rock, whereas avalanches are sudden falls of snow.
What is it called when water freezes in a crack and a piece of the rock breaks off?
Mechanical weathering is the process of breaking big rocks into little ones. This process usually happens near the surface of the planet. … That process occurs when the water inside of rocks freezes and expands. That expansion cracks the rocks from the inside and eventually breaks them apart.
How does gravity transport weathered materials?
Water erodes rocks and the landscapes by transporting weathered materials from their source to another location where they are deposited. … Gravity facilitates the down slope transportation of loosened, weathered materials and enables them to move without the aid of water, wind, or ice.
What are some examples of erosion by gravity?
Gravity moves earth materials from higher elevations to lower elevations. Landslides, avalanches, and mudflows are examples of dangerous erosion by gravity. Slump and creep move material slowly downslope.
What causes an Earthflow?
A rapid earth flow typically begins as a small landslide on a steep bank where a stream or river has eroded a valley into a sensitive clay deposit. Excess precipitation, elevated ground-water levels, earthquakes, pile driving and long-term erosion have triggered such earth flows (Sharpe, 1938; Lefebvre, 1996).
What is a Pineapple Express storm?
According to the National Oceanic and Atmospheric Administration, a “Pineapple Express” storm is a type of atmospheric river that transports moisture from the tropics to the northern areas of the planet and plays an important part in Earth’s ocean water cycle.
What causes orographic lifting?
Orographic Uplift Same as Orographic Lifting; occurs when air is forced to rise and cool due to terrain features such as hills or mountains. If the cooling is sufficient, water vapor condenses into clouds. Additional cooling results in rain or snow.
