Figure 11. This graph shows the difference from the observed tide (red) and predicted tide (blue). The difference is the storm surge amount (green). Tides exceeded the 12-foot level 5 times in 4 days at the Portland Harbor tide gauge. Just before midnight on February 25, 2010, the Portland Tide Gauge recorded a 4.37 foot surge. Since 1912, the highest surge recorded in Portland (at high tide) was 4.6 feet on March 3, 1947. The Blizzard of February 7, 1978 had a 3.5 foot surge but it occurred during an extreme high tide and holds the highest record for water levels - 2 feet above this storm. Tides ran above normal for 9 days: February 24 - March 4, 2010. Data courtesy of the National Oceanic and Atmospheric Administration. Graphic by S. M. Dickson, MGS.

Higher resolution PDF image of Figure 11.

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Last updated on July 6, 2011

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