The weather forecast indicates imminent heavy rain, flooding, and strong winds across Hawaii, with a First Alert Weather Day declared for Thursday and Friday. A low-pressure system developing to the west is causing an influx of tropical moisture, setting the stage for unsettled weather statewide. Expect heavy rainfall, thunderstorms, and an elevated risk of flash flooding through the end of the week.
Flood Watches and Wind Warnings in Effect
A Flood Watch is currently active for all islands, set to remain in place until Friday afternoon. Conditions may remain wet into the weekend and early next week.
- A High Wind Warning is also active until 6 a.m. Friday for parts of Kauai and Oahu.
- Sustained winds of 20 to 35 miles per hour, with gusts reaching near 60 miles per hour, are expected.
- Areas particularly affected include the Kauai mountains, northern Kauai, Waianae Mountains, and Central Oahu.
Previous days have already seen significant rain, with East Maui and the Puna and Ka’u districts under flash flood warnings from Tuesday evening to Wednesday morning. Specifically:
- Hana Airport recorded 11.02 inches of rain within a 24-hour span.
- The Kealakomo gauge noted nearly 16 inches of rain.
- Pahoa witnessed over 15 inches of rainfall.
Flash flooding can occur rapidly, especially as the ground remains saturated from previous rainfall in March. Any new rain will fail to absorb quickly, leading to potential runoff and flooding hazards.
Expectations for the Coming Days
Thursday is anticipated to bring a deepening upper-level disturbance west of Kauai, which will create instability and further heavy rainfall statewide.
A frontal system is projected to move toward the islands, bringing heavy showers and thunderstorms along its path. This will affect Maui County and the Big Island. Although Saturday may offer a temporary reprieve, additional thunderstorms and rain are possible, extending into next week.
Preparation Tips
The National Weather Service and Hawaii Emergency Management Agency suggest several preparations to mitigate risks:
- Clear debris from gutters, storm drains, and culverts.
- Relocate valuables from low-lying areas.
- Check essential equipment like pumps and generators.
- Ensure emergency supplies are stocked, including food, water, and flashlights.
- Review family emergency plans and check on neighbors, particularly the elderly.
Stay safe if you live near rivers, valleys, or floodplains where flooding risks are high. It’s crucial to have a Go Bag ready with important documents and preparations for evacuation, if necessary.
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