County warns Big Island to prepare for heavy rains and lightning

Hawai‘i County officials are urging heightened preparedness as a kona low develops north of Kaua‘i and pushes moist, unstable air across the state from the south and southeast. The National Weather Service has issued a statewide flood watch running from late Jan. 3 through Monday afternoon, Jan. 5, and warned that the greatest flood risk on the Big Island is expected along southeast slopes.

Such kona lows can produce strong winds and heavy rain that fall in short, intense bursts or stall over areas for hours, saturating ground and increasing the likelihood of falling rocks and landslides on steep terrain. The National Weather Service emphasized that, “On the Big Island and Maui, the greatest flood risk will be on southeast slopes.” Lightning is also a significant hazard with this system, raising danger for anyone outdoors.

Hawai‘i County Mayor Kimo Alameda urged people to prepare and monitor conditions. “Storms like this are unpredictable and potentially dangerous, so we urge the public to be prepared,” he said, and added that, “The picture right now looks like the biggest risk is to Puna and Hilo communities, but that could shift to Ka‘ū or to Kona coast communities by later this weekend.” Officials stressed that forecasts may change as the system evolves.

Residents and visitors should consider changing or delaying travel plans and outdoor activities, and avoid routes that pass through low-lying, flood-prone areas. Heavy rain uphill can cause sudden flooding even where skies appear clear; never try to cross moving water on foot or in a vehicle. “Turn around, don’t drown.” If lightning threatens, the safest place is indoors; motorists should stay in their vehicles but pull off the road if rain becomes dangerously heavy and it is safe to do so.

Prepare a go bag with food, water, medications, important documents and supplies for household members and pets in case evacuation becomes necessary. Check in with neighbors, especially those with mobility limitations, to ensure they have a plan and transportation if flooding strikes.

“This is an evolving storm, so we encourage everyone to stay informed about the forecast; if you haven’t already done so, we encourage you to sign up for emergency alerts at the Hawai‘i County Civil Defense website to receive updates on your cellphone,” said Hawai‘i County Civil Defense Administrator Talmadge Magno. For the latest watches, warnings and advisories, residents should monitor the National Weather Service Honolulu forecast office website and follow county emergency channels.