Presentation on theme: "The Rain Shadow Our Learning Target:"— Presentation transcript:
1 The Rain Shadow Our Learning Target: Describe the rain shadow effect and how it influences vegetation in Washington State.
2 Weather vs. ClimateWhat is the difference between weather and climate?“Climate is what you expect; weather is what you get.”Climate is what an area receives over a period of time.Weather is what we get that day or week.
3 Weather vs. ClimateWeather refers to the conditions in the atmosphere at a given place and time OR the day-to-day or short-term change in atmospheric conditionsIt includes temperature, atmospheric pressure, precipitation, cloudiness, humidity, and wind
4 Weather vs. ClimateClimate is the average weather condition that occurs at a place over a period of time, usually two or three decadesIt includes temperature and precipitation
5 Weather vs. ClimateClimate extends over a long period of time, whereas weather is short termPrecipitation includes fresh water falling from the atmosphere as rain, snow, sleet or hailDifferences in precipitation are due to temperature, humidity and location on Earth
6 Weather vs. Climate Water exists in three states on earth The liquid state is called waterThe solid state is called iceThe gaseous state is called vapor, cloud, fog, steam.
7 Weather vs. ClimateThe process of changing state requires that energy is transferred in the form of heat.
8 Weather vs. ClimateIf the air moves high enough, it will cool enough to eventually reach its dew point, and condensation will begin.This is the level at which cloud formation occurs.
9 Weather vs. Climate Northern hemisphere wind blows east to west Westerlies: winds blowing west across Pacific Ocean to the United StatesMoist air pushed up coastal mountainsWhen the warm air is pushed up several things occurAir coolsMoisture condenses and becomes heavy
18 Temperate Pine Forests Steppe GrasslandsEvergreen ForestTemperate ForestsDesertRain Forest
19 The Rain ShadowThe rain shadow is a dry region located on the leeward side of a mountain.Prevailing winds like Westerlies push clouds into the windward side of mountains.A rain shadow area is dry because, as moist air masses rise to the top of a mountain range or large mountain, the air cools and the maximum moisture content decreases until it reaches the dew point, where the water vapor condenses as rain or snow and falls on the windward side or top of the mountain.
20 The Rain ShadowAs the amount of rain is altered by the geography and the rain shadow the vegetation changes.