It has been 26 years since a Major hurricane has directly hit the islands in Hawaii. It was on September 11th, 1992 that Hurricane Iniki made landfall with winds at 145 miles per hour at landfall.
Since then, almost a handful of tropical depressions/storms have made landfall in Hawaii, most recently in 2016 with Tropical Storm Darby. This will not be as strong of a storm when it approaches Hawaii this week, but will still be the biggest thing near the islands in a couple of decades.
As of Wednesday night, This storm still looks quite impressive on Satellite as it nears the big island of Hawaii. One thing that is forecast to weaken this storm is the fact it will encounter wind shear in the next 24-48 hours which will work against the storm.
What is interesting to note, is the models forecasting the turn in this storm. When it does take the turn to the west, it will slow, and potentially bring very large surf and heavy rainfall.
It would not be out of the question to see areas of eastern Hawaii getting 20″ or more of rainfall.
Much of the islands will receive at least 10-15″ of rainfall, with the worst surf conditions on the east, south, and west facing coasts.
Hurricane warnings remain for the eastern half of Hawaii, and the western half of Hawaii is still under hurricane watches for now. Those watches could be upgraded as the storm nears to a warning.