Second kona low threatens renewed flooding in Hawaiʻi after record-breaking storm

Several rounds of moderate to heavy rainfall are expected, with the heaviest precipitation forecast from Friday night, March 20, through Saturday, March 21, according to the National Weather Service (NWS). The system is expected to develop west of the islands and draw abundant moisture northward across the state as it strengthens.

Although the system is forecast to be weaker than the previous Kona low, conditions across Hawaiʻi have changed significantly. Soil saturation from recent extreme rainfall means that even moderate rain can quickly lead to runoff, increasing the likelihood of flash flooding, stream overflow, and landslides.

Maui County remains particularly vulnerable after receiving the highest rainfall totals during the previous storm. Flooding and strong winds caused significant damage across South Maui, ʻĪao Valley, Upper Kula, East Maui, and Lahaina, with recovery operations still ongoing.

County of Maui officials urged residents to prepare for the incoming system while response efforts continue.

“We know this has been an incredibly difficult time for so many in our community,” officials said, noting that crews are working continuously to address storm damage while preparing for additional impacts.

Maui Emergency Management Agency Administrator Amos Lonokailua-Hewett said that although the upcoming system is weaker, it still poses serious risks. He urged residents and visitors to stay informed, prepare emergency plans and supplies, secure property, and check on vulnerable individuals, especially those living near streams.

Emergency preparations are underway across Maui County, with coordination between county departments, state agencies, and partners, including the American Red Cross. Shelters may be opened if conditions warrant, and facilities such as Ka Hale A Ke Ola Homeless Resource Center in Wailuku are available for unsheltered individuals.

County crews continue debris removal, infrastructure repair, and stabilization work while preparing equipment and personnel for additional response needs. Departments responsible for water supply and environmental management are securing infrastructure and addressing storm-related damage.

Residents are urged to clear vegetative debris and green waste to prevent blocked drainage systems. Green waste can be taken to Maui EKO Systems at the Central Maui Landfill and Hawaiʻi Organics Compost along Kuihelani Highway.

Residential pickup of additional storm-related debris, including construction materials, electronics, and appliances, is expected to be scheduled in the coming days as part of a phased cleanup effort.

All residents and businesses are encouraged to report storm damage and debris through the Crisis Track system, accessible via the Maui Emergency Management Agency website.

The Department of Water Supply has lifted water conservation advisories for most of Maui and Molokaʻi following improvements in system conditions. However, a conservation advisory remains in effect for Upper Kula, from Pilikino Place to Kanaio, where storm-related damage continues to affect water infrastructure. Temporary drinking water tanks are available in affected areas, and residents are urged to limit nonessential water use until repairs are completed.

Flood-prone roads and low-lying areas may become impassable due to elevated runoff and overflowing streams, particularly during periods of heavier rainfall. Urban areas may also experience rapid flooding due to reduced drainage capacity and accumulated debris.

Authorities are urging residents to avoid flooded roadways, secure important belongings, prepare emergency kits, and identify higher ground if conditions worsen. Travel disruptions, road closures, and localized evacuations remain possible depending on rainfall intensity.

The timing of the heaviest rainfall, expected from Friday night into Saturday, coincides with peak saturation conditions across the islands, increasing the likelihood of rapid-onset flooding and debris flows, particularly in steep terrain.

While the system is expected to weaken by Sunday, residual impacts may persist as runoff continues and ground instability remains elevated.

Meteorologists and emergency officials emphasize that this is not a routine weather event. Because the ground is already waterlogged from the previous storm, even a moderate system poses a heightened risk of dangerous flooding and landslides.

Officials continue to monitor the system closely and urge residents across Hawaiʻi to remain vigilant as recovery from the previous storm overlaps with the arrival of the next.

References:

¹ County of Maui officials urge preparedness ahead of new kona storm – Maui County – March 18, 2026

Reet Kaur

I’m a science journalist and researcher at The Watchers, contributing to the Epicenter edition, where I cover peer-reviewed scientific research and emerging discoveries across Earth and space sciences. With a background in astronomy and a passion for environmental science, I’ve worked in shark and coral conservation in Fiji, conducting reef and shark-behavior research, contributing to mangrove restoration, and earning PADI Open Water and Coral Reef Certifications. I bring a blend of scientific rigor and storytelling to illuminate the discoveries shaping our planet and beyond.

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