From the offshorerisk link in the OP, kinda makes sense when you look at it this way.



The Named Storm, Named Windstorm or Catastrophe deductible clause gives the property or boat owner plenty of incentive to protect property and with the early warning systems in place such as television, radio, newspaper, internet, weather radio bands, radio nets and other sources that should be diligently and regularly monitored before, during and after the applicable season; there should be plenty of time to implement your "Hurricane Plan" and protect your property, insured or not

It's the "you were warned to protect your property or move it out of the area" clause.