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Home Sequim Rain Shadow

Sequim Rain Shadow – A Technical Explanation

Chuck Marunde by Chuck Marunde
May 9, 2024
Reading Time: 3 mins read
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Ever wonder why Sequim residents refer to their area as the “banana belt”? They can thank the Olympic Rain Shadow. The Olympic Mountains act as a wall that protects the northeastern Olympic Peninsula and San Juan Islands from the bulk of the rain that moves into the Pacific Northwest.

The dominant airflow during rainy days around here is from the southwest. As that air runs into the southwestern face of the Olympics, the mountains push the air upward.

Sequim Blue Hole and Rainshadow

On the flip side, once the air reaches the Olympic Summit, now it’s pretty much lost its moisture. As it goes over the top of the mountains and comes down the northeastern slopes, it sinks. And just like rising air condenses, sinking air dries out as it encounters warmer air near the surface. So you already have semi-dry air becoming even drier.As the air lifts, it condenses and squeezes out its moisture — think of it as the mountains acting like a sponge soaking up and then squeezing out the rain. That’s the reason there are vast rain forests on the southwestern side of the Olympics. They receive over 200 inches of rain a year.

And, of course, Sequim sits on the northeast side of the Olympics, so they are almost always in this dry slot — although the shadow affects Port Townsend and the San Juan Islands as well. Sequim only gets about 18 inches of rain a year. Meanwhile, just 90 miles to the west, Forks receives over 120 inches of rain a year.

Check out this map of state annual rainfall totals. You can see how dry it is around the Sequim area, and how wet it is on the southwest side of the Olympics.

One interesting statistic: Port Angeles receives about 27 inches of rain a year. However, for each mile you go west of that city, you pick up an extra inch of annual rainfall.

Not Just For Sequim

But the Olympics just don’t cast their rain shadow over Sequim. In cases where the wind pattern is more westerly, the shadow will then be over the Seattle Metro area. That’s why Seattle only receives about 37 inches of rain a year — there are plenty of rainy days where Seattle gets less than others as we get the benefit of the rain shadow. If the Olympics weren’t there, Seattle would probably get closer to 50-60 inches of rain a year.

Cascade Rain Shadow

And of course, almost all of Eastern Washington is in the Cascade Rain Shadow. The physics are the same — the Cascades squeeze out most of the moisture and leave very little to make it over to Eastern Washington. That’s why it’s so dry over there. Meanwhile, rainfall totals pick up once again as you head into the western Cascade foothills.

Source: KOMO TV

Last Updated on May 9, 2024 by Chuck Marunde

Tags: Sequim Rain Shadowsunny Sequim
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Chuck Marunde

Chuck Marunde

Chuck grew up in remote Alaska, graduated from the University of Alaska with a degree in Economics and Teacher Certification, and after teaching high school for two years, went to law school at Gonzaga University in Spokane, Washington. He served four years as a Captain and JAG in the USAF at Nellis AFB in Las Vegas. After practicing real estate law for 20 years in Washington, Chuck founded iRealty Virtual Brokers covering Sequim and the beautiful Olympic Peninsula. He is the author of 2,200 real estate articles and 60 books, and he produced over 100 real estate videos. Chuck combined his love for real estate and technology to create a massive Internet presence, and his articles and videos and books have been viewed by millions. Chuck is a well recognized real estate expert and his counsel is sought by other brokers and practicing attorneys around the country. Buyers from New York to Hawaii and from Florida to Alaska seek him out to retain him as their Sequim Buyer's Agent. 

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Comments 1

  1. Louise Miller says:
    17 years ago

    Thank you. People don’t believe it when I tell them about Sequim weather. Now I can better explain.

    Reply

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