There is a detection grid already in place which will detect every single lightning strike in the USA and I'm pretty sure it doesn't get false detections.
I wonder if they have a server providing the info in real time? If so it would be just dandy to have a 'net connection in the clubhouse that looks up strikes for their latitude/longitude, or even looks for clusters of strikes moving in that direction, then sets off alarms throughout the complex. Very accurate!
Or you could even have a central office issue SMS messages to client devices, which would remove the need to make sure each business has an always-on internet connection available.
It'd be really nice because there's a possible legal liability from a guy getting struck by lightning on a golf course where the warning didn't go off. But if it's properly tied to NOAA you could better say it's not any fault of yours.
Lightning detection stuff:
**broken link removed**
I think they broadcast it on the radio too, but I'm not sure if it's digital data or computer-generated speech which would be very difficult to interpret automatically.