"Right now, these are only visitors, not an invasive species, yet," Moira Galbraith, a zooplankton taxonomist at the Institute of Ocean Sciences in Sidney, B.C., told the CBC. "They are here for now, until the currents take them elsewhere."
Nonetheless, pyrosomes pose a threat to the food chain from the bottom to the top.
As far as your summer vacation to the Northwest, you might spot some on the shores, but they don't really pose any kind of threat. Though, if you find an enormous one and are for some reason smitten with the idea of swimming into it, don't do it. It should go without saying, but that's a horrible idea.