A High Surf Advisory is in effect through 6:00 p.m. Tuesday. Along east facing shores we expect surf to build Monday into Tuesday. Surf heights of 8 to 12 foot faces are expected Monday and 10 to 14 feet through Tuesday. This advisory may need to be upgraded to a warning depending on conditions. Expect strong breaking waves, shore break and strong longshore and rip currents making swimming difficult and dangerous.
A Hydrologic Outlook has been issued by the National Weather Service. The latest forecast for Hurricane Guillermo takes the system over the island chain as a tropical storm. While Guillermo is expected to be moving steadily west-northwest as it passes across the island chain, abundant moisture drawn into the circulation will bring the potential for very heavy rainfall and flash flooding on Wednesday and Thursday. The details on the timing, location and amount of rainfall remain uncertain and are highly dependent on the eventual track of Guillermo.
A Small Craft Advisory is in effect for all the Alenuihaha channel and waters to the south and west of the Big Island through 6:00 a.m. Monday. East winds up to 25 knots and rough seas to 11 feet are expected. Inexperienced mariners should avoid navigating in these conditions.
**Click directly on the images below to make them larger. Charts include: Big Island high/low forecasted temperatures, projected winds, chance of cloud cover, projected localized weather conditions, vog/SO2 forecast and expected wave heights.**
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Today
We expect high temperatures from 87° to 92°. Northeast winds are expected around 15 mph. Mostly sunny skies are forecasted for windward areas with isolated morning showers and scattered afternoon showers.
UV index at 13 (“extreme” exposure level)
Tonight
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Partly cloudy skies are expected with scattered showers for windward areas and isolated leeward showers. Northeast winds are forecasted from 15 to 20 mph. Low temperatures from 73° to 78° are expected.
Looking Ahead
Moderate to localized fresh trades winds are expected to ease slightly on Monday. Showers will be mostly concentrated over the windward Big Island today and tonight. Hurricane Guillermo will weaken to a tropical storm then approach the eastern portion of the state early Wednesday morning and will possibly affect the state into Thursday. A moderate to locally strong trade wind flow will resume Friday into the weekend.
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Guillermo Update
The latest on Guillermo will be posted each morning and the same link will be updated throughout the day. Our hurricane tracker is also up and running!
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