Beachgoers in the Pacific Northwest should exercise heightened caution for dangerous surf and potentially fatal sneaker waves during the upcoming King Tides this weekend, and for the remainder of the winter.

Sneaker waves are disproportionately large waves which surge unexpectedly up the beach without warning. They are characterized by insignificant heights within period groups of small waves, giving the appearance of light sea conditions.

However, the sudden rush of water will immerse the dry shore and send large logs rolling. Other hazards include being swept out to sea and immersion into cold water.

Sneaker waves are the deadliest natural hazard on the West Coast.

To stay safe, familiarize yourself with the area: where all beach exits are and the location of any logs or debris. Remain further away from the waterline than you think is necessary: sneaker waves can run up at least one half the length of a football field.

Refrain from walking near or playing on any logs onshore, which can become projectiles from powerful waves.

Never turn your back on the ocean.

Winter months in the Pacific Northwest are particularly dangerous for those on shore and at sea as well. The Coast Guard strongly urges all mariners to regularly check weather forecasts and monitor bar closures or restrictions. Coastal bar observations can be found at the NWS ‘All Bars’  report.