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There is a significant rain shadow effect east of the Rockies. One prime example is Denver. Over the course of a year it would typically receive ~20 inches of rain, but many locations to the west of the continental divide receive as much as 40 inches of rain a year. (It's important to note that the rain shadow effect only impacts storms and winds traveling against the mountains. If a storm travels south to north, the effect is severely diminished and can result in a situation where the lee side of the mountains receives more rainfall than the wind side of the mountains.
The hot and humid climate
The winds that pushing the sasiling ship from north, but they are also curving to west. theses winds are known as : d. polar easterlies.
polar easterlies is the wind are blowfrom east to west.
hope this help