I think, during any emergency, a "backup operations" center should be at least 25+ miles from the main center, if not in another market. Olympia, Tacoma, Everett, Mount Vernon, or even Bremerton should be a place of operations for news operations during emergency times. KING 5 I believe has an small place in Olympia, where reporters do reports from time to time for their Olympia Bureau, so they are probably already set for an emergency (and for NWCN as well I would think), as well as a small, auxillary tower on Queen Anne. KCPQ-Q13 has KBTC's facilities in Tacoma to use as a backup (I know....I've worked there!). KOMO and KIRO don't seem to have any backups.
As far as anything transmitter-wise, Tiger Mountain and Gold Mountain should be setup as backup transmitting locations for all these stations (KCPQ has an auxillary transmitter tower on Gold Mountain). With KOMO owning KUNS now, they should setup a backup transmitting/ENG facility on West Tiger. KCPQ I think has enough of an agreement, to use KBTC to re-broadcast emergency news and information (which would also carry over to KCKA and K65BU) should their transmitter/tower ever go down.
I think KOMO should use KCTS as an "emergency" facility, should things go wrong, unless they want to send their anchors 200 miles down to Portland at KATU, and then transmitt via sattellite back to KOMO's transmitter. KIRO....I don't know what they would do, if things went wrong?? (I think KOMO and KCTS have a closer relationship).