Explanation:
In the Precipitation Map of Washington, the dark orange section indicates low rainfall in the region. Using the Shaded Relief Map of Washington, you can tell that this area is flat, possibly a plain. These areas normally don't get a lot of moisture. The Washington Precipitation Map has regions that are dark purple and dark orange. This means that they both get a lot of rain every year. If you look at these areas on the Washington Shaded Relief Map, you can see that these areas with a lot of rainfall are mountainous.
On the Washington Precipitation Diagram, purple/blue means more rain, and orange/red means less rain. Washington's Shaded Relief Map shows the mountains (br)