Why you don't see Eastern Wash. wildfire plumes until the afternoon

Local social media posts have been perking up each afternoon noting tall plumes of clouds over the Cascades. What you're seeing are smoke and the "pyrocumulus" clouds created by the wildfires burning in Eastern Washington. The heat from the fires is its own engine for creating rising air that cools and condenses into clouds.

But why don't we normally see those clouds over here until the afternoon?

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Sunset Wednesday night from the hills northeast of Grand Coulee Dam looking in the direction of the Carlton Fire.