Kilauea is on the verge of erupting again. The Hawaiian Volcano Observatory raised the volcano’s alert level to WATCH and its aviation color code to ORANGE on May 13, 2026, after overnight cameras captured an intense glow with periodic flaming at the south vent and bursts of molten spatter at the north vent inside Halema’uma’u crater. In its public notice, HVO stated that Episode 47, the next pulse in a summit eruption sequence that has been running since late 2024, “could start at any time now,” with a forecast window of May 13 to May 14.
The activity follows the end of Episode 46, which wrapped up days earlier after producing lava fountains and fresh flows across the crater floor. That pattern of eruption, pause, and re-eruption has defined Kilauea’s behavior for months, with each new episode sending fountains of varying height from vents inside the collapsed summit crater. Episode 47 would mark the latest chapter in a sequence that has kept volcanologists, pilots, and nearby communities on a recurring cycle of alert.
What HVO is seeing right now
The overnight observations that triggered the alert-level change came from HVO’s V1cam, a continuously streaming camera trained on Halema’uma’u. According to the observatory’s daily update, the camera recorded periodic spattering at the north vent, which HVO interprets as lava sitting close to the surface. Separately, the south vent displayed strong glow with periodic flaming, a sign that magma is pressing upward through both vents at once.
“Overnight webcam observations recorded periodic spattering at the north vent,” HVO wrote in its update, adding that the activity is “a sign that Episode 47 is potentially nearing.”
HVO forecasts episode timing primarily by tracking inflationary tilt at summit stations. The UWD tiltmeter, which measures ground deformation in microradians, feeds continuous data into models that compare current inflation rates against thresholds observed before prior episodes. When the tilt curve approaches levels that preceded Episodes 45 and 46, forecasters narrow the window. That process produced the May 13 to May 14 range. The raw tiltmeter dataset (DOI 10.5066/P145C5WE) is publicly available through the USGS Science Data Catalog, and auto-updating deformation plots are hosted on HVO’s monitoring data page for anyone who wants to watch the inflation curve in real time.
What the alert levels actually mean
The jump from ADVISORY to WATCH is not just bureaucratic housekeeping. Under the USGS Volcano Hazards Program’s four-tier system, WATCH indicates heightened or escalating unrest with increased potential for eruption, or that an eruption is underway but poses limited hazards. It sits one step below WARNING, the highest level, which would be issued if fountaining begins and hazards intensify.
The parallel ORANGE aviation color code signals that an eruption is forecasted to be imminent with the potential for significant ash emissions, or that an eruption is underway with no significant ash emissions or with ash emissions below flight levels. In practice, Kilauea’s recent summit episodes have produced relatively modest ash compared to explosive eruptions at other volcanoes, but the designation triggers closer coordination between airlines and the USGS public information page for Kilauea, which is refreshed as conditions evolve. If a sustained ash column develops, the Volcanic Ash Advisory Center would issue trajectory and concentration forecasts for flight planning.
What visitors and residents should know
For the thousands of people who visit Hawai’i Volcanoes National Park each week, the WATCH designation is the clearest signal to check park conditions before heading out. Past episodes have prompted the National Park Service to temporarily close crater-rim overlooks and trails near Halema’uma’u when lava fountains send volcanic glass (known as Pele’s hair and Pele’s tears) and sulfur dioxide plumes downwind. No Episode 47-specific closures had been announced as of May 13, but the situation can escalate to WARNING within hours once fountaining begins.
Sulfur dioxide gas is the more persistent hazard for downwind communities. HVO routinely measures SO2 emission rates during active episodes, and elevated levels can trigger air quality advisories for parts of the Island of Hawai’i, particularly in areas affected by volcanic smog, or “vog.” Residents with respiratory conditions are typically advised to limit outdoor exposure when vog levels spike during eruption episodes.
What nobody can predict yet
For all the data streaming off Kilauea’s flanks, several key questions remain unanswered. HVO has not published the specific tiltmeter thresholds that would confirm Episode 47’s onset; its public messages describe inflation trends in qualitative terms rather than releasing numerical trigger points. That means outside analysts cannot independently verify how close the system is to erupting.
How Episode 47 will compare to its predecessors in fountain height or duration remains an open question. Episodes in this sequence have varied considerably in vigor and duration, and HVO has not released a probabilistic breakdown of likely scenarios for the next pulse. The observatory’s time-stamped interpretive messages are the best available guide, though they carry inherent forecast uncertainty that HVO itself acknowledges by providing a date range rather than a single predicted start time.
No projected ash-cloud trajectories or concentration estimates specific to Episode 47 have appeared in the public record, either. Airlines and pilots are operating under the general ORANGE framework until the eruption actually begins and plume data can be collected.
Tracking Episode 47 through HVO’s own data layers
The strongest evidence that Episode 47 is close comes from three layers of primary USGS documentation working in concert: HVO’s daily update carrying the official alert-level designation and forecast window, the Volcano Notification Service public notice detailing overnight observations, and HVO’s time-stamped interpretive messages offering near-real-time analysis of what the cameras are capturing. All three originate from the same monitoring team and tell a consistent story of magma poised just beneath the crater floor.
Behind those public statements, the UWD tiltmeter and other deformation instruments give technically inclined readers a way to track the same inflation signal HVO uses to set its forecast windows. Rising tilt reflects magma accumulating beneath the summit and pushing the ground surface upward. When that tilt flattens or reverses, it typically means magma has found a pathway to the surface and a new episode has begun. The auto-updating plots let anyone watch for that inflection point in real time.
What the data does not support is any specific claim about how high the fountains will reach, how far lava will spread across the Halema’uma’u crater floor, or whether new vents could open along the summit. The current signals point to a localized summit event, not a broad flank eruption or large-scale explosive episode. But Kilauea has reminded observers before that volcanoes do not always follow the script, and the rapid escalation potential built into the alert system exists for exactly that reason. When Episode 47 begins, it will add another chapter to one of the most closely watched eruption sequences on Earth.
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*This article was researched with the help of AI, with human editors creating the final content.
