King tides will sweep across San Diego beaches this weekend and a few others over the next few months, sending powerful waves surging against seawalls and making for unusually low tides—prime opportunities to explore tide pools. King tides will sweep across San Diego beaches this weekend and a few others over the next few months, sending powerful waves surging against seawalls and making for unusually low tides—prime opportunities to explore tide pools. Earth Sciences Environment Phys.org – latest science and technology news stories