When the Sun, Earth, and Moon are in this position, the high tides will be higher than normal levels because

Higher than normal high tides and lower than normal low tides will occur. Mean sea level is typically higher due to changing weather patterns and increasing water temperatures.

Explanation:

Around each new moon and full moon, the sun, Earth, and moon arrange themselves more or less along a line in space. Then the pull on the tides increases, because the gravity of the sun reinforces the moon's gravity. In fact, the height of the average solar tide is about 50 percent of the average lunar tide.