Tuesday, November 4, 2008

Maine tidal anomaly

On 28 October unusual tidal fluctuations were observed in the Boothbay, Maine and Cundys Harbor areas. Massive amounts of water flushed into and then drained the bay. There appear to be two general theories as to the cause of the phenomenon. Meteorologists aren't sure but suggest that seismic forces were at work, while the Coast Guard has posited that the area experienced a seiche generated by an offshore storm.

Boston.com reports:

"BOOTHBAY HARBOR, Maine—Meteorologists are baffled by rapid tidal changes along the Maine coast, which damaged some boats and piers.

Witnesses say low tide turned and became high within a matter of minutes on Tuesday afternoon. The changes occurred six or seven times. The National Weather Service says reports from several locations indicated that water levels fell and rose from 4 feet to as much as 12 feet during the event.
In a public information statement, the weather service says the cause "remains a mystery and may never be known."
It said significant rapid rises and falls in tide levels were observed around 3 p.m. in Boothbay Harbor, Southport and Bristol. The statement said rapid surges can be caused by the underwater movement of land, most often due to an earthquake, or due to slumping of sediments along a steep canyon or shelf, but no earthquakes were reported in the area Tuesday.
A similar event occurred on Jan. 9, 1926, in Bass Harbor, the statement said."


While WCSH reports:

"BOOTHBAY HARBOR (NEWS CENTER) -- Some boats were scratched and docks damaged Tuesday afternoon when low tide became high within a matter of minutes.

The Coast Guard is calling it a storm surge. As the water was flowing out for low tide, a storm off-shore pushed it back in bringing the water level back almost near the high water mark.

Locals in the area say it happened about 6 or 7 times throughout the afternoon. They say it surged in within a matter of 5 minutes, then flowed back out just as quickly.

A similar surge was also reported in Cundy's Harbor.

Officials say they want to remind coastal residents to keep their boats securely tied to their docks when they know a storm is happening off the coast."



Those must have been some currents!