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How Proximity to a large body of water affects Percipitation :)

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Jessica Holzinger

on 25 April 2013

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Transcript of How Proximity to a large body of water affects Percipitation :)

How Proximity of a large body of water affects Precipitation :) Water Cycle! Evaporation. The sun heats water in rivers, lakes, and the ocean and turns it into vapor or steam, which then rises into the air.

Condensation. The vapor cools and turns into and form clouds.

Precipitation. tiny water droplets that attach to each other fall from the clouds as rain, snow, sleet, or hail.

Then the cycle begins again, as water from the earth’s surface evaporates into the air. Since you couldn't see the water vapor to well we made our own video to help you see :) Okay so moving on ... :) It tends to rain more in quantity when it rains, because the ocean is a source of moisture; a storm system continues to add moisture as it drops it out when near large bodies of water.


There also tends to be more cloudiness and precipitation on the downwind side of large water bodies; moist air blows off the ocean and either cools over the land (when the air is cooler, like at night and early morning) making fog and low clouds, or rises (when the ground is hotter like in the day) and cools in the higher atmosphere making rain and higher clouds.



The air near the ocean tends to be cooler in the summer and warmer in the winter because water changes temperature a lot slower than land, so it is warmer than nearby land in cold weather and cooler in hot weather. Temperature near the coast tends to be buffered, to vary less than it does inland.



Windiness is a normal condition of shoreline areas, as the temperature differences between land and water cause the air to move on or off shore, generally in a daily cycle, as the land heats or cools on exposure to or absence of sunlight.


If you think about places that tend to have a lot of cloudiness and rain, they are places on the generally downwind side of large water bodies. San Francisco, Seattle, Vancouver, London, Buffalo. and so on. According to some websites people and other resources, these are the explanations that they came up with. Rainfall patterns depend on a variety of variables, including proximity to large bodies of water, including oceans and very large lakes, proximity to mountain ranges and what side of the mountains you are on. Regions close to large bodies of water always receive more precipitation, how ever this includes places like buffalo NY which is adjacent to Lake Erie. mountains cause are to rise, and as the air rises it condenses, and any water vapor in the air will likely precipitate. This is why regions between the ocean and Mountain range receive so much rain such as in the Oregon and Washington coast. Since most of the precipitation falls onto the windward side of the mountains ( the side from which the wind blows), there is less water left as it reaches the leeward side of the mountain. Often this translates into the coastal side and the inland side of the mountains, but it is not always necessarily the case. As a general rule in the U.S the coastal regions receive more rain than the central part of the U.S, however, as you can see in the map I'm about to show you, mountain ranges have a bigger impact on precipitation that just distance from the coast. Okay so I know we have to follow the KISS method and I'm sorry if this is a little to complicated so let us break it Down for you into steps :) 1.The water increases humidity in surrounding area: Water from lake ( or other body of water) evaporates and turns into moisture in the air. The water vapor-rich air spreads out through diffusion and with wind.

2. The water lowers temperature: Because water has a lower tendency to change temperature, it stays cooler than the surrounding air. When wind blows across the surface of the water, the air cools.

3. Contributes to rainfall: The water evaporates, condenses and forms clouds. This process increases the likelihood of rainfall in the area.

4. Process of development : Because a body of water allows for easy access by humans, devolpment is more likely to occur. With development, often comes factories, agriculture, or other such pollution-high developments. The pollution is proven to cause the temperature to rise. But also the main reason is that the ocean is the largest contributor to atmospheric moisture from which we get the rain and snow. The areas coastal areas that are immediately down flow from oceans get the most. Once the flow is lifted over a coastal mountain barrier, which often wrings out a substantial amount of the water from the atmosphere, it can be very dry until the air again moves over an ocean.

The water off the coast of Southern California is cool and does not transfer much moisture to the atmosphere. The Gulf of Mexico is warm and the air is warm and much moisture is put into the iar above it. Dallas is humid in summer and San Diego is not. I hope these examples help you understand how proximity to a large body of water influences precipitation not only in Different regions In Canada but Regions all around the world, now to see if you where paying attention we will randomly pick one of you to answer the main question. Why does it tend to rain more when you live in a region near a large body of water? Okay so today we are going to be talking about how proximity to a large body of water affects the precipitation of the surrounding areas. Or, in simpler terms, how being near large lakes, seas, oceans etc. makes it rain more or less in nearby areas. So we want to start off by talking a little bit about the water cycle :) Now you may be wondering why or how the water evaporates and condenses. We'd like to explain this with an experiment. As you could see in the videos, as the water heats up it forms steam or "water vapor" and rises (as all gases do) Than when it meets the cool wall of the atmosphere, the particles of the gas slow down and condense into clouds, from there, they further condense into water droplets and fall. Now this may explain why we have precipitation in the summer, the sun heats the water up and rises to meet the cold air high up in the sky. But you may be wondering why we get snow in the winter? It still works in close to the same way. Water can evaporate at any temperature, it just evaporates faster in warmer temperatures. That's why in the winter most of the precipitation comes from wind currents carrying water from other places. Now to get back on topic, when there is a large body of water to draw from, more water evaporates and turns to clouds, the more clouds there are, the more precipitation there is in surrounding areas! THE END
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