• Hawaiʻi State Senate

City and County of Honolulu releases map of possible storm surge on O‘ahu

As Hurricane Douglas approaches the state there is a strong possibility of coastal inundation and storm surge particularly along the east facing shores. This is just one of the reasons it’s so important to be prepared. This map, produced with guidance from the Central Pacific Hurricane Center, is a worst case composite for a storm with similar intensity, forward speed, and trajectory as Hurricane Douglas, incorporating uncertainties in the track, intensity, and size forecast.

Link here : http://bit.ly/shelterinplaceorevacuate

While this is not exact, it paints a picture of what we can expect. This map depicts the potential flooding that could be produced from storm surge during a tropical cyclone similar to Hurricane Douglas. Storm surge is water from the ocean that is pushed onshore by the force of the winds and should not be confused with surf. This map does NOT depict inundation from surf and it does NOT depict flooding caused by rain. Those along the windward coast of Oahu should pay particular attention to the possibility of the combined effects of storm surge, high surf, and flooding from rain.

This map should only be used as a general guideline for understanding where storm surge flooding could occur given the current forecast situation. Flooding from storm surge depends on many factors, such as the track, intensity, size, and forward speed of the tropical cyclone and the characteristics of the coastline where it comes ashore or passes nearby. These factors are difficult to predict far in advance of a tropical cyclone affecting a particular area. It includes many assumptions and has limitations, and it cannot tell you what amount of flooding will definitely occur at any given location. The actual areas that could become flooded may differ from the areas shown on this map. This map accounts for tides, but not waves and not flooding caused by rainfall.

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Copyright 2019 Hawai`i Senate Majority

Hawai`i State Capitol
415 South Beretania St.
Honolulu, HI 96813