Smoky skies helped it rain across Seattle Thursday morning
It wasn't just the clouds that made a rather eagerly awaited return to the Seattle area Thursday morning, but many spots even got a little bit of rain!
Sea-Tac Airport reported 0.01" of rain, making August 23rd an official rainy day.
Getting some drizzle or mist isn't unheard of in the marine layer but Thursday's rain was a bit more than a typical marine push.
Why? Blame the smoke.
"The smoke in the air is enhancing the drizzle by increasing the number of cloud condensation nuclei [CCN] available in the atmosphere," the National Weather Service in Portland wrote Thursday. "[CCN] gives water vapor a place to collect, and is needed for rain formation."
Air quality readings were still in the "Very unhealthy" category as the marine layer cloud layer thickened Thursday morning around Western Washington, providing a raindrop formation's paradise for the incoming moisture.
That process also helped wash a lot of the smoke particles from the sky, and air quality readings quickly improved to "good" around Seattle.
The push wasn't as strong in the North Sound, and areas from about Everett north to the border were still awaiting much of the smoke to blow away.