Yep pretty much pabloako, having an entire district/s labelled as Catastrophic (in situations like tomorrow's where catastrophic risk is forecast to be in isolated pockets) would be misleading and wouldn't really be representative of the majority of the region.
It's better to say what the FDR's will be like overall for a region and add that isolated Catastrophic FDR's are possible.

Either way though, the fire weather's going to be nasty tomorrow so one can only hope any existing are well-contained, any new fires are contained quickly, and that arsonists, cigarette butt throwers, etc aren't out in force.

Even though forecast FDR's decrease a bit on Saturday, the gusty winds that day don't leave much room for complacency on that day either.