**High tide, third highest on record, set Tuesday morning in Charleston, South Carolina, on October 27, 2015. (NOAA)
Only three events produced higher tides at Charleston Harbor: Hugo on Sep. 21, 1989 (12.56 feet), an August 11, 1940 hurricane (10.27 feet) and a New Year's Day 1987 coastal storm (8.84 feet) produced higher tides at Charleston Harbor.
Tuesday's tide level was 4-5 inches higher than the peak measured during the historic South Carolina flooding and coastal flooding event earlier in October. Fortunately this time, there wasn't 17-27 inches of rainfall occurring at the same time.
We mentioned earlier, there was no tropical storm, hurricane, or even bullish coastal low-pressure system associated with this event.
Instead, the pressure gradient between strong high pressure centered over the Northeast U.S. and low pressure over the northern Gulf Coast set up the persistent east to northeast winds driving water ashore.
http://www.weather.com/storms/severe/news/charleston-south-carolina-georgia-coastal-flooding
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