Lava fountains soaring 650 feet above Kilauea’s summit lit up the morning sky over Hawaii’s Big Island on Tuesday, May 6, 2026, as the volcano roared into its 46th eruptive episode and sent a column of ash and gas roughly 20,000 feet into the atmosphere. Within 35 minutes, the National Weather Service in Honolulu issued an ashfall advisory for communities downwind, warning residents of Volcano, Mountain View, and surrounding areas of southeast and east Big Island to stay indoors and wear masks if they had to go outside.
At Uekahuna overlook, approximately 0.7 miles from the erupting vent inside Halemaʻumaʻu crater, park observers reported fist-sized chunks of volcanic rock raining down, a sign of just how much energy was behind the fountains. All eruptive activity remained within Hawaii Volcanoes National Park, but the ash drifting on trade winds did not stop at the boundary.
The eruption timeline
The U.S. Geological Survey’s Hawaiian Volcano Observatory recorded the onset of Episode 46 at 8:17 a.m. HST on May 5, following roughly 18 hours of escalating earthquakes and ground inflation beneath the summit. HVO scientists had flagged a likely eruption window of May 4 through May 7 based on the tilt cycles that have reliably preceded each episode since this eruption sequence began on December 23, 2024.
The north vent inside Halemaʻumaʻu produced lava fountains visually estimated at 650 feet above ground level, as reported in HVO’s photo and video chronology. HVO typically derives fountain heights from visual observation and comparison with known landmarks rather than direct instrumental measurement, so such figures carry some inherent uncertainty. The resulting plume reached approximately 20,000 feet (6,000 meters) above sea level, prompting the observatory to set the volcano alert level at WATCH and the aviation color code at ORANGE. Those designations mean the eruption is underway and could intensify, though scientists have not identified an immediate threat to populated areas beyond ashfall.
Forty-six episodes in roughly 16 months makes this one of the most persistently active periods at Kilauea’s summit in recent decades. The pattern has been remarkably consistent: magma rises into a shallow reservoir beneath the crater, pressure builds over days to weeks, and then the system releases in a burst of fountaining that can last hours or, occasionally, a couple of days before quieting again. Two vents inside Halemaʻumaʻu have alternated between vigorous jetting and calm pauses throughout the sequence.
Ashfall and air quality concerns
The NWS ashfall advisory, effective until 8 p.m. HST Tuesday, covers Big Island Southeast and East districts. Fine volcanic ash can irritate lungs, aggravate asthma, scratch windshields, and clog engine air filters. For residents with respiratory conditions, the risk is especially acute.
Beyond the gritty fallout, sulfur dioxide gas is a persistent concern during Kilauea summit eruptions. SO2 reacts with moisture and sunlight to form volcanic smog, known locally as vog, which can degrade air quality across wide stretches of the island depending on wind patterns. HVO routinely monitors SO2 emission rates, and elevated levels are expected during active fountaining phases. Residents with heart or lung conditions are advised to track air quality updates from the National Weather Service and the Hawaii Department of Health.
No official measurements of ash accumulation thickness outside the park had been published as of Tuesday afternoon, and laboratory analysis of the tephra’s particle size and volcanic glass content was still pending. Those results will help determine whether this episode’s fallout poses greater risk to health and agriculture than earlier ones in the sequence.
Transportation and park access
Even a thin layer of ash on roads can cut visibility and turn pavement slick when mixed with moisture. The standard advice: slow down, keep headlights on, and avoid running windshield wipers over dry ash, which grinds into glass. Vehicle owners in affected areas may need to inspect and replace air filters in the days ahead.
The ORANGE aviation color code puts airline operators and air traffic controllers on alert. Volcanic ash can erode turbine blades and stall jet engines, so flights near the summit may be rerouted or adjusted in altitude even if no cancellations are announced. As of the advisory’s issuance, no flight diversions had been confirmed by NOAA or carriers.
Inside Hawaii Volcanoes National Park, visitors should expect shifting conditions. While no specific closure orders appeared in the USGS or NWS notices reviewed for this report, the park has a well-established protocol for active eruptions: rangers typically shut down overlooks, trails, and sections of Crater Rim Drive when gas concentrations spike, ashfall intensifies, or ballistic fragments threaten areas near the rim. Checking the park’s website or calling ahead before visiting is the safest bet.
Putting the fountains in perspective
A 650-foot lava fountain is spectacular, but Kilauea has produced far taller ones. During the 1959 Kilauea Iki eruption, fountains reached a record 1,900 feet. The current episode ranks among the more vigorous in the ongoing sequence, though HVO has not publicly stated whether the height represents an escalation in the system’s energy or simply falls within the range of normal variability for this eruptive period.
The 2018 lower East Rift Zone eruption, which destroyed more than 700 homes in the Leilani Estates subdivision, was a fundamentally different event: lava broke out along fissures miles from the summit and flowed through residential neighborhoods. The current activity is confined to Halemaʻumaʻu crater, well within the park, and the primary hazard beyond the crater rim is airborne ash and gas rather than lava flows.
What to watch in the hours ahead
HVO scientists are tracking three key indicators to gauge whether Episode 46 is winding down or building toward a longer phase: seismic tremor beneath the summit, ground tilt recorded by instruments around the crater, and direct observation of fountain behavior. A shift from sustained fountaining to intermittent spattering, paired with declining tremor, would typically signal the episode is tapering off.
Downwind ashfall reports from residents and field crews will fill in the picture on the ground. Measurements of deposit thickness on flat surfaces, combined with lab analysis of particle composition, will shape future health guidance and preparedness messaging for communities that have lived with this eruption cycle for well over a year.
For now, the core facts are straightforward: Kilauea’s summit is actively fountaining, the eruption is contained within Halemaʻumaʻu crater, and an ashfall advisory is in effect for parts of southeast and east Big Island. How long Episode 46 lasts and whether it marks a shift in the volcano’s behavior are questions only the next few days of data can answer.
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*This article was researched with the help of AI, with human editors creating the final content.
