—
Daily predicted tide range (difference between highest high and lowest low each day). Larger ranges follow new and full moons (spring tides); smaller ranges follow quarter moons (neap tides).
The 12h 25m Cycle
Most coasts see two high and two low tides a day, driven by the Moon. A tide clock sweeps one full turn every 12 hours 25 minutes — half a lunar day — so the needle always points at where you are in the cycle.
Spring & Neap Tides
Around new and full moons the Sun and Moon pull together, producing larger "spring" tides. Around quarter moons they work at right angles, producing smaller "neap" tides.
Heights & Datums
Heights shown are relative to MLLW (Mean Lower Low Water), the standard NOAA chart datum. A negative low tide is lower than the average lowest tide — great for tidepooling.
Predictions, Not Guarantees
Tide predictions are astronomical. Wind, storms, and barometric pressure can raise or lower actual water levels. Always check official sources before navigation.