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Flood Watch issued across Hawaii as kona low system brings risk of heavy rain and flood

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Flood Watch issued across Hawaii as kona low system brings risk of heavy rain and flood


A statewide Flood Watch is in effect across Hawaii from Wednesday morning, April 8, through Friday afternoon, April 10, as a developing low-pressure system northwest of the islands, described by the National Weather Service (NWS) public guidance as a kona low, is forecast to bring prolonged heavy rainfall and elevated flood risk.

The NWS office in Honolulu reports that the system will draw deep tropical moisture northward across the state, creating conditions favorable for widespread showers and thunderstorms. Excessive rainfall may lead to flash flooding in urban areas, low-lying locations, and regions with poor drainage, while steep terrain remains susceptible to landslides.

All major islands, including Kauai, Oahu, Maui, Molokai, Lanai, Kahoolawe, and the Big Island, are included in the Flood Watch. Forecasters note that antecedent wet conditions from recent rainfall events have left soils saturated, increasing runoff efficiency and the likelihood of rapid stream rises under heavier rainfall rates.

Satellite image acquired at 04:00 UTC on April 7, 2026. Credit: NOAA/GOES-West, RAMMB/CIRA, The Watchers

Multiple kona low systems affected the islands between March 10 and March 22, producing extreme rainfall totals, including more than 330 mm (13 inches) in about 12 hours on Oʻahu’s North Shore and multi-day accumulations reaching approximately 1 170 mm (46 inches) on Maui.

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The events triggered widespread flooding, landslides, evacuations, and infrastructure stress, including emergency warnings tied to Wahiawā Dam and power outages affecting more than 130 000 customers statewide.

Despite several days of drier trade wind conditions, soil moisture remains elevated, allowing new rainfall to convert more efficiently into surface runoff, increasing the likelihood of rapid stream rises and flash flooding under the current forecast system.

The heaviest rainfall associated with the new system is forecast to develop during the midweek period, with conditions deteriorating from Wednesday into Thursday as the low-pressure system strengthens west of the state. Forecast guidance indicates that the western islands may experience the initial phase of heavier rainfall before activity gradually shifts eastward later in the event.

In addition to heavy rain, the system is expected to generate strong southerly winds, with gusts of 64–80 km/h (40–50 mph) possible across many areas and locally stronger gusts exceeding 93 km/h (58 mph) in exposed locations or near convective activity. A Wind Advisory may be issued as conditions develop.

Winter weather conditions are also possible at higher elevations on the Big Island, resulting in a Winter Storm Watch in effect for summits above 3 810 m (12 500 feet), where a combination of snow and freezing rain is forecast during the same period.

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Heavy rainfall is likely to persist into Thursday and Friday, with the flash-flood threat remaining elevated into the weekend, but periods of heavy rain may continue beyond the initial peak as moisture remains in place around the system.

The setup reflects a kona low pattern, characterized by a low-pressure system northwest of the islands producing southerly flow and transporting deep tropical moisture into the region over multiple days.

References:

1 Area Forecast Discussion for Hawaii – NWS Honolulu – April 7, 2026

2 Flood Watch – NWS Honolulu – April 7, 2026

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Paid parking lots debate continues – Hawaii Tribune-Herald

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Paid parking lots debate continues – Hawaii Tribune-Herald






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PHOTOS: 4 ways locals celebrated July 4 this year

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PHOTOS: 4 ways locals celebrated July 4 this year


HONOLULU (KHON2) — Various celebrations — beyond the usual fireworks and barbecues — marked the U.S.’s 250th anniversary on Independence Day.

From regatta to an annual Japanese tradition on Oʻahu, here’s four other events that took place on this July 4.

84th Regatta

To start off the morning, the 84th Walter J. Macfarlane Memorial Canoe Regatta was held at Waikiki Beach.

“Today there’s a swell. It’s not huge, but it’s not flat, so I mean it’s like a perfect requirement day, there’s excitement, there’s enough activity to keep it, first the variable, and keep everybody on their toes, and it makes for close races,” said Jim Foti with the Lanikai Canoe Club.

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Canoe paddlers of all ages hit the water for a full day of racing.

“We have had some really fun races this morning,” said Siana Austin Hunt, president of the Oahu Hawaiian Canoe Racing Association. “Our kids did really well. We also had some great finishes with a lot of crews finishing on the same wave.”

The regatta is a tradition that is recognized as the longest-running outrigger canoe races in the world.

America250

Kapiolani Park served as the backdrop for America’s once-in-a-lifetime celebration commemorating 250 years. The free event brought families together for food, music, performances and special recognition for our military and veterans.

America250 event in Kapiolani Park on July 4, 2026.

“There’s a lot of people that’s been going around the different booths and the different venues and enjoying themselves, listening to the music every hour on the hour, and at the same time they’re looking at some of the auditory, tasting the various different types of food, and just enjoying yourself and relaxing,” said Lynn Mariano, commissioner of Hawaii America250 Commission.

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La Hoʻihoʻi Ea

While many celebrated Independence Day, others gathered at Iolani Palace to reflect on a different perspective of Hawaiʻi’s history into statehood.

The event highlighted La Hoʻihoʻi Ea, or Sovereignty Restoration Day, which commemorates the history of the Hawaiian Kingdom and encouraged a discussion about Hawaiian sovereignty and self-determination.

“We’re here to reclaim our place to retell our stories and to resound the message of Hawaiian sovereignty restoration,” said Imai Winchester, lead organizer for La Hoʻihoʻi Ea.

The free event included cultural performances, music, educational exhibits, speakers and family activities. It was the first of a month-long series of events that will lead up to a celebration on July 26 at Thomas Square.

Organizers said it’s an opportunity to learn, reflect and celebrate Hawaiian identity.

Mōʻiliʻili Summer Fest

An annual Japanese tradition fell on the 4th of July this year. The popular Mōʻiliʻili Summer Fest drew in thousands to the Old Varsity Theater parking lot on University Avenue.

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Now in its 13th year, the event prides itself on having one of Honolulu’s largest bon dances — and no obon festival is complete without taiko drums and andagi.

One of the booths was prepared to sell thousands of the deep-fried treat, with proceeds supporting Hawaii’s young athletes.

The festival is held every first Saturday of July.



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First Alert Forecast: Classic Hawaii trade wind weather

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First Alert Forecast: Classic Hawaii trade wind weather


HONOLULU (HawaiiNewsNow) – Partly to Mostly Sunny skies with windward and mauka showers drifting leeward at times. Most of the rainfall will be light and in the overnight to early morning hours with an increasing trend on Tuesday and stronger trends on Thursday and Friday; which is good because we need to beneficial rainfall.

View the latest weather conditions here.

Trade winds will continue blowing from the east all week while a high-pressure system sits north of Hawaii, keeping conditions mostly stable. On Tuesday, a weak weather system moving in from the east will bring some extra showers across the islands, but nothing major. A more significant system arrives Thursday through Friday—it’s actually the leftover remains of a tropical cyclone—and will bring noticeably heavier rain, especially on the windward sides of the islands (the sides facing the trade winds) and on mountain slopes, with humidity increasing as well. The highest rainfall will happen Thursday through Friday, though overall rainfall amounts will stay limited due to large-scale stability in the atmosphere.

A Small Craft Advisory now in effect for all Hawaiian waters (a warning for smaller boats to be cautious). A new long-period swell from the south-southwest is already moving in and will boost south shore surf heights to near-High Surf Advisory levels through Monday before gradually fading. East-facing shores will remain rough and choppy throughout the week from the strong winds, while north-facing shores will stay relatively flat. These windy conditions and Small Craft Advisories will continue through the entire week.

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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)

Copyright 2026 Hawaii News Now. All rights reserved.



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