Hawaii health officials have put out food safety guidance for power outages, useful for anyone facing storm-related blackouts.

• Food in the fridge is no longer safe after four hours without power.
• A half-full freezer keeps food safe up to a day if you keep the door shut.
• A full freezer stretches that to two days, again only if it stays closed.
• The state Department of Health's rule of thumb: when in doubt, throw it out.

Outlook: Expect the same guidance to resurface with each storm or grid failure that knocks out power across the islands.