12/24/2014 11:55 EST | Updated 02/23/2015 05:59 EST

King tides return on Christmas morning, coastal residents warned

King tides along the coast of B.C. will reach their highest levels on Christmas morning, prompting a warning to seaside residents to be on the alert for flooding.

Two weeks ago the seasonal tides combined with a storm surge to flood shorelines across the South Coast of B.C., triggering local states of emergency in Delta, Courtenay and Campbell River.

Municipal workers in Vancouver also put down 30,000 sand bags along low-lying areas near Locarno Beach, but flood conditions never materialized. The city left the bags in place for the king tides expected on Christmas Day.

While there is no storm in the immediate forecast for coastal areas of B.C., the sandbags will remain in place until mid-January, when the high tides should return to normal levels, the city website says.

King tides are extreme high tides that happen about twice a year when the sun and moon's gravitational forces reinforce each other.