HONOLULU (HawaiiNewsNow) – Your First Alert Weather Team has declared Thursday, and Friday as First Alert Weather Days for all islands for a storm system that is expected to bring more heavy rain and flash flooding.
A developing, deepening low-pressure system west of the islands is drawing deep tropical moisture northward, setting up a period of unsettled weather statewide. Expect periods of heavy rain, thunderstorms, and an increasing risk of flooding through the end of the workweek.
A Flood Watch remains in effect for all islands through Friday afternoon, and conditions may stay damp into the weekend and even early next week.
View all current weather alerts here.
A High Wind Warning is also in effect until 6 a.m. Friday for portions of Kauai and Oahu. Sustained south winds of 20 to 35 miles per hour with gusts near 60 miles per hour will be possible for Kauai mountains and north Kauai, as well as the Waianae Mountains, Central Oahu, areas near the Koolau range and especially areas that are downslope of the strong south winds.
East Maui and the Puna and Ka’u districts of Hawaii Island were under prolonged periods of flash flood warnings from Tuesday evening through Wednesday morning.
The Hana Airport received 11.02 inches of rain in the 24 hours that ended at 8 a.m. Wednesday. The Kealakomo gauge on Hawaii Island recorded nearly 16 inches of rain, while Pahoa received more than 15 inches.
Flash flooding could occur quickly and without warning if we do see another round of heavy rainfall. The ground remains mostly saturated following the deluge of rainfall we experienced in March, meaning any additional rainfall will struggle to absorb into the ground and could lead to quick runoff.
Thursday: An upper level disturbance is expected to deepen west of Kauai. Increasing instability will bring periods of locally heavy rain statewide. Strong southerly winds are expected that could cause damage for portions of Kauai and Oahu
Thursday night into Friday: A frontal system is expected to form to the west of the islands. Heavy showers and thunderstorms along the frontal zone are forecast to surge eastward, to Maui County and Hawaii Island. This is expected to be a widespread rain event.
Saturday onward: A brief break may be possible Saturday, but overall, the pattern remains unsettled. Additional rounds of showers could linger into the weekend, with another wave possible Sunday and continued wet weather potential into next week.
This forecast will continue to be adjusted as new data arrive. Expect changes to the timing, duration and impact of this system.
Here are some of the preparations you should make, according to the National Weather Service and the Hawaii Emergency Management Agency:
- Make sure to clear debris from gutters, storm drains, and culverts to help reduce localized flooding.
- Move valuable items out of low-lying areas.
- Check equipment, such as pumps, generators, and tools.
- Take stock of supplies, including flood, water, medicine, flashlights, and backup power sources.
- Review family emergency plans. Check on your neighbors and kupuna, especially if they live in low-lying areas that are prone to flooding.
- Be cautious and aware if you live near a river, stream, valley, ravine, or floodplain where flooding is possible. Know a safe place to go and have a Go Bag ready with essential documents and other items.
View the latest weather conditions here.
Download the HNN Weather app from the Apple App Store or Google Play for the latest updates from your First Alert Weather Team: chief meteorologist Jennifer Robbins, meteorologist Drew Davis, and weather anchors Guy Hagi, Ben Gutierrez, and Billy V.
Download HNN’s weather app for everything you need to plan your day.(Hawaii News Now)
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