Terrain is the most significant factor in the Pacific Northwest weather.
Key Takeaways:
The Pacific Northwest's weather is fundamentally shaped by its unique geography, including coastal and Rocky Mountains, which dictate air mass movement and precipitation.
Summer patterns are dominated by a stable marine layer from the cold Pacific Ocean, often resulting in "marine pushes" of fog and stratus inland, along with seasonal wildfires and late-summer monsoon moisture.
Winter weather is characterized by intense frontal systems and "atmospheric rivers" originating from the Pacific, bringing heavy precipitation and strong winds, while eastern cold air outbreaks can cause extreme foehn winds and prolonged valley fog.
For those of us who dwell in the southern and eastern states, Seattle makes us think of craft beer, grunge music, sprawling Boeing factories, and relentless drizzle and fog. I won’t comment on Pearl Jam or what’s new at Boeing, but I can definitely help decipher the weather. Fortunately the basics are easy to understand. Let’s take a look.
Some Background
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