High tide, the occurrence when the water level in the ocean or sea reaches its maximum, is a natural phenomenon that has a range of synonyms. "Flood tide" is often used to describe the high tide condition where the tide rises to its highest level. "Spring tide" is a phenomenon that occurs twice a month when the sun, moon, and Earth align in a straight line, resulting in more significant tidal waves. "Surge tide" is a term used for an unusually high tide caused by a severe weather system. "Perigean tide" is another term used to describe high tides, and it occurs when the moon is at its closest distance to the Earth, causing tides to be higher than usual.