A Hydrologic Outlook has been issued by the National Weather Service. Heavy rain and flash flooding are possible Thursday and Friday as Hilda approaches the state. The NWS warns that regardless of its strength, the system will have the potential to produce very heavy rainfall and flash flooding.
A Tropical Storm Watch is posted from 6:00 p.m. Wednesday through 6:00 a.m. Saturday for the Big Island and its surrounding coastal waters. Heavy rain will likely be the greatest impact from Hilda. The cumulative chance of tropical storm conditions at this time ranges from 2 to 6 percent.
A Flash Flood Watch has been issued for the Big Island. This watch goes into effect at 6:00 p.m. on Wednesday through 6:00 a.m. Saturday. Abundant moisture from weakening Hilda is expected to produce the potential for excessive runoff, rock/mudslides and fast-moving water that could create life-threatening situations.
A High Surf Warning is posted for the east side as swell generated by Hilda builds. The warning is posted through 6:00 a.m. Thursday. Wave heights of 12 to 18 feet are expected Wednesday. Expect ocean water occasionally sweeping across portions of beaches, very strong breaking waves and strong longshore and rip currents. Breaking waves may occasionally impact harbors making navigating the harbor channel difficult. Large breaking surf, significant shore break and dangerous currents will make entering the water very hazardous. Boaters should be aware of an increased number of surfers in the water.
A Tropical Storm Warning is posted for Hawaiian offshore waters from 40 nautical miles out to 240 nautical miles until further notice.
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**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 83° to 88°. North winds are expected from 15 to 20 mph in the morning shifting out of the northeast from 15 – 30 mph in the afternoon. Partly to mostly cloudy skies are forecasted with frequent showers expected in windward areas. Leeward spots are expected to be sunny to start with building cloud cover and numerous afternoon showers. There is a slight chance of heavy rain and thunderstorms in the afternoon.
UV index at 12 (“extreme” exposure level)
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Tonight
There is a slight chance for thunderstorms with locally heavy rainfall tonight. Mostly cloudy skies and frequent showers are expected for windward spots. Leeward spots should be partly to mostly cloudy with numerous showers. Northeast winds are forecasted from 15 to 20 mph. Low temperatures from 71° to 76° are expected.
Looking Ahead
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Hilda continues to slowly approach the Big Island. A disturbance high in the atmosphere remains north of the state and is expected to enhance showers, producing some localized heavy rain and a slight chance of thunderstorms Wednesday. Hilda is expected to bring widespread rain across the Big Island, with some rain expected for the smaller islands.
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