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<br />WEATHER SYSTEM <br /> <br />When atmospheric conditions organize over South Dakota as <br />shown in the figure below, rain producing weather occurs - <br />possibly even severe weather. <br /> <br />The colder <br />upper air <br />replaces <br />warmer air <br />above 10,000 <br />feet causing <br />the atmosphere <br />to become <br />unstable. <br /> <br /> <br />~ <br /> <br />~ <br /> <br />27 <br />