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The Great Plains Ecoregion
The Great plains is a region in mid-west United States.
== Climate ==
The climate is unique due to the many different wind patterns that flow throughout the region, traveling from east to west and north to south. Due to the fact that this region is geographically positioned in the center of the United States and Canada, there are many different air mass types that pass through and affect the constantly shifting weather patterns. This means that the Great Plains has a less consistent climate due to its central location than a region located on the coast. This is shown by how the western Great Plains is semi-arid, while the eastern portion of the Great Plains is much wetter. It has the four seasons of summer, autumn, winter, spring, but each season brings new extremes in the weather conditions. For example, the southern portions of the region typically experience 70 to 100 days each year over 90°F, while the northern portions typically see only 10 to 20 days above 90°F. It’s the air masses that come in from all directions that bring this variable climate.
Each air mass type brings in different temperature and moisture properties. The continental polar air mass brings in cold and dry air from central Canada, traveling south across the region. The continental tropical air mass comes in from the Gulf of Mexico and the Caribbean, bringing in hot and dry air while moving north. The maritime tropical air mass comes from the southwest United States and Northern Mexico, and it tends to bring in warm and moist air, but sometimes the air that comes in is dry. The last air mass that affects this ecoregion is the maritime polar air mass. It comes in from the Pacific and moves east over the mountain regions. It brings in cool moist air that changes to warm dry air after moving over the mountains. These air masses cause the seasons to be very extreme and drastic. The winter time brings harsh and varied weather. The midsummer months bring in warm and moist and dry air, depending on the area within the region and what air masses affect those areas.
Paralleling the varying climate patterns is the precipitation. The areas nearest the Gulf of Mexico, where the atmospheric moisture is greatest, will receive more than forty inches of precipitation annually. The eastern areas of the region, such as Montana, receive less than fourteen inches annually. In the winter time, the southern region has less than an inch of snowfall, while the northern regions receive more than forty. The spring time is also a season that brings much precipitation to the Great Plains through the cold, dry air masses that interact with the air masses from the Gulf of Mexico, creating outbreaks of severe thunderstorms with heavy rainfall, high winds, hail, and tornadoes. Most of the winter season in the Northern Plains actually has a snow blanket over a majority of the winter season. This shows how there is consistent precipitation over the region during the winter months, while in the heat of summer there is more chance for drought with sporadic heavy rains.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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