As a result, the clouds moving eastward over the greater part of the Great Plains between the Rockies and the Mississippi are dry.The area is mainly watered only during the spring melting.

• 结果，向东经过落基山脉和密西西比河之间大平原的大部分地区的空中云系携带雨水较少，因此，这一区域主要在春天融雪时期才能得到灌溉。