A slow-moving Kona low-pressure system affected Hawaii during the week of March 10, 2026, prompting widespread flood alerts and emergency preparations. Governor Green issued two emergency proclamations as the event unfolded, while state agencies coordinated resources for vulnerable populations across the island chain. Outage impacts were widely reported, but the state sources linked below do not provide a single confirmed, statewide tally.
What the Forecast Office Predicted
The National Weather Service Honolulu office, the forecast authority for all of Hawaii, issued detailed guidance warning of potential flash flooding, damaging winds, and strong to severe thunderstorms tied to the Kona low. The agency projected that the storm’s peak intensity would arrive Friday and Saturday, with impacts spreading from west to east across the islands. That directional pattern meant western-facing slopes and communities took the first hit, while eastern areas had a narrow window to prepare before conditions deteriorated.
By 4:00 P.M. on March 12, the NWS had formally forecasted the Kona low-pressure system affecting the summits and surrounding areas, according to Hawaii County’s proclamation issued the following day. That county-level declaration cited the NWS forecast as the factual basis for activating local emergency powers, a step that freed county agencies to redirect funds and personnel toward storm response without waiting for normal procurement cycles. It also underscored how much local officials now rely on real-time meteorological data when deciding whether to close roads, open shelters, or pre-stage rescue assets.
Forecasters leaned on national tools such as digital forecast maps and satellite-based rainfall estimates to refine their projections as the Kona low stalled near the islands. For aviation and inter-island travel, products from the aviation weather center guided decisions on flight diversions and airport operations as thunderstorms flared along key routes. The combination of localized expertise in Honolulu and national modeling support helped emergency managers anticipate which islands would see the most dangerous conditions first.
Governor Green’s Escalating Emergency Orders
Governor Green issued an initial proclamation establishing the state’s emergency posture for storm conditions expected from Tuesday, March 10, through Sunday, March 15, 2026, a six-day window that reflected the system’s unusually slow pace. The state emergency management office published the order, which activated state resources and authorized emergency spending authority across multiple departments. This first proclamation allowed agencies to suspend certain regulations, mobilize personnel on overtime, and coordinate with county governments under a single statewide incident framework…