| Northern New England coastal flooding - :6645 | National Weather Service (NWS)
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Northern New England coastal flooding
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    "As ocean levels rise and population increases near the shoreline, coastal flooding continues to become an increasingly important issue. Storm surge and splash-over play a vital role leading to damage along the Maine and New Hampshire coastline. Coastal flood prediction is challenging as complex bathymetry and an irregular coastal configuration dominates this region. To improve this prediction and better conceptualize this phenomenon for meteorologists and emergency managers, a coastal flood climatology was created for northern New England. Discussion of wind and wave dynamics, the Ekman Spiral and the role of atmospheric pressure also served to provide an educational background. The lengthy Portland Harbor Tide gage record allowed for a comprehensive comparison with historical floods found in Storm Data Publication. Meteorological data was combined with oceanographic observations to correlate multi-scale environmental conditions which induce flooding. Predicted versus observed tidal conditions were compared and model guidance was examined for modern day cases. The results indicated coastal flood damage was primarily observed during periods of significant storm surge coinciding with large ocean waves, strong northeast winds, or in rare cases extreme rainfall. Coastal inundation primarily occurred during the cold season with tides recorded above and below the 12 foot (3.7 m) benchmark in Portland Harbor. In a limited dataset, statistically and dynamically driven storm surge guidance showed equal and opposite biases of storm surge prediction"--Abstract.

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