As supermoon sets, the king tide rises
PORTLAND, Maine (NEWS CENTER)-- The December 3rd supermoon was the closest the Moon will be to Earth for the entire year, and the only supermoon of 2017. While Sunday night's moon appeared seven percent bigger and 15% brighter than the average full moon, NASA says a supermoon can appear up to 14% larger and 30% brighter at its closest proximity to Earth.
With the affect that the Moon already has on the tides around the globe, one can assume a closer Moon would mean a higher tide- and you'd be right. Monday's high tides will not only be the highest of December, but they'll be higher than the average high tide. This kind of natural occurrence is called a king tide, a commonly used term for a higher than normal high tide.
Most of coastal Maine will experience tides one to four feet higher than usual, all peaking between 10:30-11:45am.
Flooding is a possibility on these days; in November of 2016 after the largest supermoon seen in decades, Portland Harbor saw a high tide of 12 feet. The swell of water spilled out on to Commercial Street in the city's Old Port. The same harbor is expected to see a tide of just over 11 feet on Monday.
The next time anyone will see a supermoon will be in January 2018 when two will occur in the same month, one on January first and the other on January 31st.
The biggest and brightest supermoon since 1948 will light up the sky one November night in 2034.