Perigean spring tides, the scientific name for king tides, occur during a new or full moon and when the moon is at its perigee (closest to the Earth). The gravitational pull of the moon is strongest during these periods, and the average range of tides increases. This winter, the National Oceanic and Atmospheric Administration (NOAA) predicts that king tides will occur:
- November 15-17, 2020
- December 13-15, 2020
- January 11-13, 2021
The Oregon King Tides Photo Project has been documenting the level of the sea during these high tides for 10 years. By documenting the highest reach of the tides each year, the organization is learning how natural and built environments are susceptible to erosion and flooding. Anyone can submit photos to the project by uploading images online. Providing photos that include landmarks, such as buildings, bridges, sea walls or beach infrastructure, can be especially helpful for gauging fluctuations of the tide.