Tropical Storm Olivia

Monday 9/10/18 6:30PM

The Central Pacific Hurricane Center reports that as of 5:00 pm, Hurricane Olivia has been downgraded to a Tropical Storm, located 380 miles ENE of Hilo with sustained winds of 70 mph, moving W at 10 mph.

Olivia is now a high-end tropical storm and is expected to bring
strong winds, heavy rainfall, and high surf to parts of the state this
week. Olivia is forecast to close in on the main Hawaiian Islands
Tuesday and move over portions of the island chain Tuesday night and
Wednesday.

Maui and the Big Island will be the first to experience
impacts from Olivia. Do not focus on the exact forecast track or
intensity of the storm and be prepared for changes in future
forecasts. Also, keep in mind that just because Olivia is forecast to
be a weaker storm than Lane, the impacts could be significantly worse
due to its passage directly over the islands.


Damaging tropical storm force winds are expected to begin as early as
Tuesday afternoon across Maui and the Big Island. Additionally,
hurricane force wind gusts are possible as Olivia moves across the
state Tuesday night and Wednesday. Remember that the mountainous
terrain of Hawaii can produce localized areas of highly enhanced
winds, even well away from the tropical cyclone center.


The chance for flooding rainfall will increase rapidly late Tuesday
and remain a significant threat through Thursday. Storm total rainfall
amounts are expected to be around 10 to 15 inches, with isolated areas
up to 20 inches. Much of this will be focused on windward areas of the
islands of Maui County and the Big Island, however, flooding is still
a significant threat for all areas.


Swells and surf generated by Tropical Storm Olivia will continue to
slowly build through Tuesday, and reach damaging levels on some east
facing shores Tuesday and Wednesday. Surf heights along east facing
shores are expected to reach up to 20 feet on Maui and the Big Island,
and 10 to 15 feet on all other islands. This surf is expected to
result in significant beach erosion and overwash onto vulnerable
coastal roadways, particularly during high tides.

Due to Tropical Storm Olivia, the following advisories are in effect: 

  • Tropical Storm Warning for Hawaii Island. A Tropical Storm Warning is issued when there is a high probability of tropical storm force winds expected anytime within the next 36 hours.
  • High Surf Warning for east facing shores of Hawaii Island, from Cape Kumukahi to Upolu Point.
  • Flash Flood Watch for Hawaii Island. Do not cross fast flowing water in your vehicle or on foot. Turn around don’t drown! 

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