We almost made it from SFO to ORD. The pilots executed a "missed approach" and diverted to Rockford, where we now sit. The First Officer told me they had a wind-shear alert indicating a 20kt change in windspeed right on our approach path. That could, in aviation parlance, ruin your day. So here we sit...and wait... At least we're getting granola bars, water, and frequent updates. And we're getting obnoxious passengers. More tomorrow.