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Nature㽶Ƶֱs aquarium opens along B.C. shores with swelling tides 㽶Ƶֱ and a warning

New Moon, lunar perigee, and northern orbit combine for a shoreline spectacle May 27㽶Ƶֱ29
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The lowest tide of the year is expected for Wednesday, May 28.

Get ready for a tidal rollercoaster 㽶Ƶֱ Greater Victoria is about to see its lowest tide of the year, followed by some of its highest, all in a matter of hours.

The tides around the region are set to swing dramatically at the end of May, driven by a rare and powerful alignment of lunar and solar forces.

According to the Canadian Hydrographic Service, water levels are expected to dip to 㽶Ƶֱ0.22 metres at 10:46 a.m. on Wednesday, May 28 㽶Ƶֱ the lowest of 2025. A day earlier, on Tuesday, May 27, tides will fall to 㽶Ƶֱ0.19 metres at 10 a.m.

In sharp contrast, high tides will peak at 2.99 metres earlier Wednesday at (May 28) 2:01 a.m. and 2.93 metres in the early hours of Thursday (May 29).

㽶ƵֱThese extreme tides are the result of several astronomical factors combining at once,㽶Ƶֱ said Denny Sinnott, supervisor of tides, currents and water levels with Fisheries and Oceans Canada. 㽶ƵֱWe㽶Ƶֱll see a New Moon on May 26, which means the sun, moon, and Earth will be in near-perfect alignment.㽶Ƶֱ

This alignment creates what㽶Ƶֱs known as a spring tide 㽶Ƶֱ a term that refers to the tide 㽶Ƶֱspringing forth,㽶Ƶֱ not the season. These tides occur twice a month and bring slightly higher highs and lower lows than usual. But in this case, the spring tide㽶Ƶֱs effects are intensified.

㽶ƵֱThe moon will also be in perigee 㽶Ƶֱ the closest point in its elliptical orbit around the Earth 㽶Ƶֱ on May 25,㽶Ƶֱ Sinnott said. 㽶ƵֱWhen the moon is closer, its gravitational pull on the ocean is stronger. Combining that with the New Moon alignment increases the pull even more.㽶Ƶֱ

Adding to the mix, the moon will reach its farthest point north of the equator on May 28. This positioning further enhances the gravitational effect over Victoria㽶Ƶֱs coastal waters. Sinnott noted that the combination of all three events 㽶Ƶֱ perigee, New Moon, and the moon㽶Ƶֱs northernmost point 㽶Ƶֱ creates an unusually large tidal range.

㽶ƵֱThere can be a day or so lag in the tide㽶Ƶֱs response to these astronomical conditions, which is why the extremes appear around May 27 to 29,㽶Ƶֱ he explained.

For shoreline visitors, this rare tidal event offers an excellent chance to explore tide pools and marine life typically hidden underwater. But Sinnott cautioned that these wide-ranging tides can also generate stronger-than-normal currents.

㽶ƵֱIt㽶Ƶֱs a great time to poke around the shoreline, but always be aware of your surroundings,㽶Ƶֱ he said.

The Canadian Hydrographic Service publishes tide tables and real-time data to help mariners, beachgoers, and coastal residents plan ahead. With such significant shifts expected, checking  is more important than ever.



Tony Trozzo

About the Author: Tony Trozzo

Multimedia journalist with the Greater Victoria news team, focused on covering sports and music.
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