The first tip came from a post in the Alki Beach Community Yahoo! group, after someone spotted that sign on the front doors at the vacant (demolition permit still pending) Shoremont at 57th and Alki. And behind the building, police tape is up:

We’ve been trying since last night to find out exactly what kind of training you’re likely to see there tomorrow; it’s not being coordinated from the Southwest Precinct, as our contacts there didn’t know, but were trying to find out. So for now, in case you are in the area tomorrow and happen to see a heavy police presence, we thought we’d at least pass on the news about the posted signs. (The Fire Department uses vacant buildings too, as this webpage reminds us.) 7 PM UPDATE: Just heard back from the precinct – it’s tactical training: “Washington State Tactical Officers Association is conducting training at this site tomorrow. The training is being sponsored by SPD SWAT.”