Final answer:
The orographic effect, like the Cascade Mountains, contributes to Spokane receiving less rain than Seattle.
Explanation:
Orographic effect plays a significant role in explaining why Spokane gets less rain than Seattle, other than the Cascade Mountains. As air masses move up the Cascades, the moisture is wrung out, creating a rain shadow effect on the leeward side of the mountains. This leads to considerably less precipitation in Spokane compared to Seattle.
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