Since the rain shadow effect is so complex, there are several parts to my hypothesis. Gravity. On one side of the mountain, wet weather systems drop rain and snow. (See Fig. Tall clouds, enhanced by orographic lifting, are pushed forward by the wind carrying with them some of the heavier rain that would normally fall in the mountains.

After crossing this portion of the hill, the wind has no water vapor present in it and remains simply dry. In places where the coastal elevation rises steeply, however, it is not possible for the ocean air to pass over the land without rising above the level of the mountains. When there is no wind, there is no initial sloped line because rainfall should be equal on both sides. W is the peak wind speed at Location 3, 8m above the ground, 6km NNE of the Sierra Azul ridge. Storms usually do not have the same wind speeds and cloud heights for equal time periods, so the shape of the curve is totally dependent on what percentage of the storm is at a certain intensity. The orographic effect happens on the windward side of a mountain. Expanding gases tend to cool, so the temperature of the air mass drops sharply with rising altitude. Copyright Qries 2018. In most storms, there is still plenty of moisture in the valley for rain, just not enough to maintain the added precipitation due to orographic lifting. The distance from this point to the mountains depends on the temperature, wind speed and the vertical height of the clouds. It means that since the expected variables are too insignificant, the rainfall in this location is random and unpredictable.

Will 5G Impact Our Cell Phone Plans (or Our Health?! The rain shadow effect occurs as warm, moist air rises against high elevations of land and drops its water along the way. Cold, rarefied air is very poor at retaining water vapor, so the water in the air tends to precipitate out along the windward slope of the mountains.

I needed very specific information.

The air over large bodies of water tends to be dense, warm and moist. The Santa Cruz Mountains, to the south, can receive more than four times as much. As the intensified rain from the mountains passes into the valley, it loses its intensity at a constant rate. These values are impractical and difficult for anyone to measure accurately, even with the most sophisticated equipment. The value for rain sub San Jose is at the Civic Center downtown.

The rainfall variation in even the most contrasting storms is still relatively small compared to the amount of possible error. lvrlit lvrlit A rain shadow is a patch of land that has been forced to become a desert because mountain ranges blocked all plant-growing, rainy weather.

Newtons First Law states that an object (such as a cloud) with no force acting on it moves with constant velocity. Because detailed, highly specific information for such a small geographic location is nearly impossible to find, I had to retrieve the data myself. This promotes evaporation. I was also interested in detailed information on exactly how the mountains affect the rainfall in different parts of this valley. The steep slope which would represent that period, added with the flatter part, would produce an initially steep line which becomes less sloped where the effects of the lighter winds taper off. Saturated air moves easily along the surface of the water, as there are very few obstacles to its passage. The rainfall amounts increase dramatically as you move farther up the mountain on the windward side. (c) The distribution of 850-hPa wind direction during storms with weak (red), strong (blue), and neutral (white) rain shadows. (See Table 1), I set up the 7 rain gauges. Most of them do not even mention the rain shadow effect. There was also another long period of the storm with heavy rain and light winds. If all the other factors, such as wind speed, temperature, air pressure, air instability, and humidity are about the same, and they usually are in the valley during a winter storm, the rainfall should decrease in intensity at a constant rate. Because of this, there should be very little variation in rainfall past the reach of the intensified rain forced in to the valley by wind. Other variables besides wind and possibly temperature are too insignificant compared to the random variations that are possible. However, that does not mean that there is no rainfall variation past a certain point. Festival of Sacrifice: The Past and Present of the Islamic Holiday of Eid al-Adha. An equation could be made to estimate the ratio of the amount of rainfall before orographic lifting takes place to the amount of rainfall in the rain shadow. Wind is the main variable.

I could not find any detailed information on the subject. Then at about 17km it leveled off. 4.5), I used my altimeter, along with the topographic map to find the elevation at these different sites. Also, taller clouds should travel farther before dissipating, so taller clouds would also produce a smaller slope. Some adverse effects of acid rain are detailed in this article.

More rain usually falls when there is more wind, so the curve should remain somewhat straight. There are two major effects of wind. Also, since San Jose and Scotts Valley are 35 kilometers away from each other, a lot of random things can happen between the two places. The result is less rainfall in San Jose than on the other side of the Santa Cruz Mountains.

Since there are an infinite number of different wind speeds and cloud heights in a storm, there are an infinite number of slopes for the initial line. Fact Check: What Power Does the President Really Have Over State Governors? When this wind moves onto a hill or an elevated land, it has lower pressure where its capacity to hold water in the form of water vapor decreases. I repeated this for the next two systems, which came soon after the first one. Both of the initial lines are slightly curved. The point at which the sloped part of the graph and the flat part meet should also be dependent on the wind speed and cloud heights, and it appears to be according to the graphs.

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