Related Clues:

• Mariner's datum
• Periodic Pacific disruption
• Weird weather phenomenon
• Bay of Fundy wonder
• Destroyer of small castles
• Rise and fall of the sea
• Sea phenomenon
• Sprinkler setting
• Floral decoration
• Sea __
• Sea motion
• Phenomenon measured by a marigraph
• Alternative to roll-on
• Warming current
• It's high part of the time