King Tides Along the Jersey Shore

Flooding in Ocean City via njconservation.org/help-document-sunny-day-flooding

You may be hearing the term "king tides" recently on the news, connected to weather conditions. What are "king tides?" A king tide is a non-scientific term for the highest predicted high tide of the year at a coastal location. 

New Jersey is experiencing a major king tide window right now, and more are expected in the near future. New Jersey is currently in the middle of a predicted king tide window spanning October 27 to 28, 2026. Triggered by yesterday’s full moon converging with the Moon's closest approach to Earth, 8 out of 9 NOAA monitoring stations across the state are seeing their highest astronomically predicted tides.

What Causes King Tides?
Celestial alignment plays a role. These tides happen when the orbits and alignments of the Earth, Moon, and Sun combine to create maximum gravitational pull. They occur when the Moon is closest to Earth (called perigee) during a New or Full Moon.

Depending on the region, they often happen a few times a year during specific seasons, such as fall and winter. 

One common effect is called "sunny day flooding." The weather is fine, but these tides can push seawater over seawalls and up through storm drains onto streets even on clear, cloudless days with no storms. They also cause very low tides at alternate times of the day, which can expose marine life, sandbars, or shallow channels.

The absolute highest tide of this specific New Jersey window is occurring at Wildwood Crest, reaching an estimated 6.0 feet—which sits a notable 1.1 feet above normal high water levels (MHHW).

While high pressure is keeping skies mostly dry, the sheer gravitational force of this alignment is causing "sunny day" minor coastal flooding. Tidal waters are spilling onto the most vulnerable low-lying roads and bayside communities along the Jersey Shore during morning high tide cycles

King tides are called "king" because they represent the highest, most dominant natural high tides of the year. Just as a king sits at the top of a hierarchy, these tides tower above normal daily and monthly high tides, creating the largest tidal range (highest highs and lowest lows). 

NOAA's National Ocean Service would refer to them as perigean spring tides. Besides when the Moon is at perigee, they often occur during specific times of the year when the Earth is also closest to the Sun (perihelion) or when weather and warm water expansion add extra height.