How are change-overs between regional air traffic patterns communicated? The airport near me that has two major landing/takeoff patterns part of a large regional air traffic control plan involving other major international airports (SFO/OAK/SJC)  

The duplicate-cited question addresses the general question of change-over. I am in need of public service information on when this change happens.  I have edited this question to remove the general curiosity. 

Generally  I would like to know how  the changes between two regional plans  is communicated or published to the public or if it is available on a public service. Specifically, the East-Plan/West-Plan change in the SFO/OAK/SJC area (CA, USA)



90% of the time the take off direction is in direction that does not impact me. 

When the prevailing winds change the takeoff pattern is directly overhead. This has an impact on alarms and equipment. In order to automate the shutdown of certain equipment I would like to monitor regional ATC information.  I have considered simply monitoring flight patterns, prevailing winds, and weather conditions. A definitive source is preferred because it takes some time to reconfigure the equipment.  Does such a ATC or FAA source exist for the general public?
There won't be any publicly available source for what you're looking for. Any information that you could get access to (as mentioned below) won't be reliable enough to predict when the runway changes will occur. The initial coordination always happen over secured phone lines between the controllers at the radar approach/center facilities and towers. There is no way you can hear this. 

Each airports ATIS (Automated Terminal Information Service) (https://en.wikipedia.org/wiki/Automatic_terminal_information_service) will be reporting what the runway(s) in use are - but this won't actually change until the runway change becomes active, maybe 5 minutes before. I suppose it would be possible to monitor this, probably via LiveATC (or setting up your own equivalent). You could somehow monitor or export this information and listen for key words to trigger your whatever-you're-using-to-shut-off-your-"sensitive equpiment" - but I think you'd get a lot of false positives. On the same note, you could also hear controllers making their initial calls to pilots advising them of the impending runway change (probably on arrival feeder sectors of ATC or the center descent clearances). 

I don't think either of these methods are reliable enough for what you're looking to do. You may consider moving your "sensitive equipment" to somewhere not near an airport.