Figure 12. A graph of tidal elevations from April 6 through 7, 2009 measured at the Portland tide gauge. The blue line shows that predicted tides would have reached a height of about 4.5 feet Mean Sea Level or 10 feet Mean Lower Low Water (not shown). The red line illustrates the actual water level with additional height due to a storm. The difference in height is the storm surge and it was about 1.5 feet. This additional elevation, along with waves, helped the storm overtop the Seawall Beach spit. The spit blocks the Morse River from flowing straight south on a shorter course to sea and may someday be breached by a larger storm. Graph courtesy of the National Ocean Service's CO-OPS web site.
Last updated on May 6, 2009