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Coast Guard: Hawai‘i Should Prepare Now for ‘Heavy Weather’

August 29, 2016, 1:13 PM HST
* Updated August 29, 1:16 PM
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The Mariners' 1-2-3 Rule, or "Danger Area", is indicated by shading. The 1-2-3 Rule, commonly taught to mariners, refers to the rounded long-term forecast errors of 100-200-300 nautical miles at 24-48-72 hours, respectively. The contour defining the shaded area is constructed by accounting for those errors and then broadened further to reflect the maximum 34-kt wind radii forecast at each of those times by the CPHC. The CPHC does not warrant that avoiding these danger areas will eliminate the risk of harm from tropical cyclones. Users operating in the vicinity of these systems are advised to continually monitor the latest Forecast/Advisories from the CPHC and proceed at their own risk. The danger area will not be depicted from tropical cyclones when they become extratropical.

The Mariners’ 1-2-3 Rule, or “Danger Area”, is indicated by shading. The 1-2-3 Rule, commonly taught to mariners, refers to the rounded long-term forecast errors of 100-200-300 nautical miles at 24-48-72 hours, respectively. The contour defining the shaded area is constructed by accounting for those errors and then broadened further to reflect the maximum 34-kt wind radii forecast at each of those times by the CPHC. The CPHC does not warrant that avoiding these danger areas will eliminate the risk of harm from tropical cyclones. Users operating in the vicinity of these systems are advised to continually monitor the latest Forecast/Advisories from the CPHC and proceed at their own risk. The danger area will not be depicted from tropical cyclones when they become extratropical.

The US Coast Guard is urging the public to prepare for the onset of heavy weather expected to impact the Hawaiian Islands on Wednesday.

Currently, Hurricane Madeline has maximum winds of 100 mph and is expected to generate high surf throughout the main Hawaiian Islands.

Mariners and beachgoers are asked to monitor the progress and strength of the storm through media outlets.

Boaters can also monitor the progress of the storm on VHF channel 16. Small craft advisories and warnings are also broadcast on VHF channel 16.

The Coast Guard is working closely with local and state first responder agencies. Once the storm begins to impact the islands, emergency responders may not be able to assist those in danger. The public is urged to heed all evacuation orders. Mariners should seek safe harbor and shelter.

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Additionally, mariners should secure their boats and boating equipment. Owners of large boats are urged to move their vessels to protected marinas where they will be less likely to break free of their moorings or to be otherwise damaged. Smaller boats should be pulled from the water and stored in a place that is not prone to flooding and is protected from high winds. Regardless of location, all loose items aboard vessels should be secured or removed.

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Visitors to Hawai‘i should heed all warnings from lifeguards and public health and safety officials. Although weather conditions may appear favorable, rip tides and high surf may impact beaches far in advance of the actual storm. Even the best swimmers can fall victim to strong storm-generated waves and currents. Swimmers are urged to stay clear of beaches until local officials say the water is safe. Near-shore waters may become contaminated due to runoff for several days following a storm.

A PDF version of the Hawai’i Boater’s Hurricane and Tsunami Safety Manual can be found online.

For more information on hurricane preparedness, visit the National Hurricane Center online.

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