Watch the mountains create their own weather patterns
You can watch the process play out from Greg Johnson's camera at Skunkbayweather.com
But it's not always showers and thunderstorms. Check out this video from Don Jensen who was up at Mt. Rainier during a weekend in mid-July and captured all sorts of interesting cloud patters around the mountains, including the opposite pattern when the lowland are socked in with a marine layer but he was above the clouds at 7,200 feet.