The Pacific coast experiences mixed semidiurnal tides with two unequal high tides and two unequal low tides each day. This creates unique tidal patterns different from the Atlantic coast.
Understanding Mixed Tides
Mixed tides feature a higher high tide, lower high tide, higher low tide, and lower low tide each day. The difference between these tides varies throughout the month based on the moon position.
Regional Variations
Pacific Northwest
Washington and Oregon coasts experience 8-12 foot tidal ranges during spring tides. Puget Sound has complex tidal patterns with strong currents in narrow passages.
Northern California
From the Oregon border to San Francisco, tidal ranges average 6-8 feet. San Francisco Bay has strong tidal currents flowing through the Golden Gate.
Southern California
From Point Conception south, tidal ranges decrease to 4-7 feet. The Southern California Bight creates unique tidal patterns influenced by ocean currents and coastal geography.
Seasonal Patterns
West Coast tides show distinct seasonal variations with the lowest low tides occurring in summer months, making this the best time for tide pooling and beachcombing.
El Niño Effects
El Niño events raise sea levels along the West Coast by several inches, causing higher high tides and increased coastal flooding during winter storms.
Conclusion
West Coast mixed tides create unique patterns that affect coastal activities. Understanding these patterns helps you plan optimal times for fishing, tide pooling, and beach access.