Why do we check the weather forecast?

We left Port Angeles yesterday morning at 0700, motoring out the Strait of Juan DeFuca.  Twelve hours later, as we were passing Neah Bay, the last possible anchorage before the open Pacific, we checked weather one more time.  Well, they were calling for thunderstorms over the next few hours, so we decided to duck in here for the night.  Of course, it was totally calm and quiet all night.  Now they're calling for light and contrary winds over the next few days, but what do they know?