Seaside uses the official lifeguard flag when that flag was checked within about 30 hours. Open the live Seaside report for the current hour, or move the day and hour controls for the next week.
The page uses the same readings as the iPhone app: sky, air temperature, wind, humidity, UV, rain chance, wave height, swell period and direction, tide, water temperature, clarity, and rip risk. Activity buttons for swimming, floating, snorkeling, paddle boarding, sea shelling, surf fishing, surfing, kayaking, boating, and kite surfing turn green, blue, or red with the same rules as the app.
The chart under the beach controls is the next 12 hours of wave height. Green is clean surf, blue is fair, and red is choppy. The line above the chart is the reading for the hour you picked: height, swell seconds, swell direction, wind, the surf word, the tide, and the rip risk.