VolcanoWatch | U.S. Volcano Alert & Aviation Impact

Source health

Cached

Validated build-time USGS Volcano Hazards Program snapshot checked Sep 21, 2026. Latest individual notices in this snapshot are dated Sep 18–20, 2026. The embedded snapshot remains visible if the source is temporarily unavailable.

Question

Which U.S.-monitored volcanoes currently have elevated alert levels, and what do their aviation color codes indicate?

Current elevated statuses

Legend

RED: eruption imminent/underway with significant ash emission expectedORANGE: heightened unrest or eruption with limited/no ash emissionYELLOW: signs of elevated unrest above backgroundGREEN: normal background state

Method

Markers reproduce official USGS Volcano Alert Level and Aviation Color Code categories. Marker size is a MitchellCo display aid only: WARNING=18 px, WATCH=15 px, ADVISORY=12 px, NORMAL=9 px. Size is not a probability, forecast, or official numeric risk score. Only volcanoes shown by USGS with elevated current status in this snapshot are plotted; absence from this layer does not mean a volcano has no long-term hazard.

Sources & vintage

USGS Volcano Hazards Program current updates and USGS Hazard Notification System for Volcanoes, checked Sep 21, 2026. Coordinates, alert levels, aviation codes and summaries are from corresponding USGS notices. Basemap: © OpenStreetMap contributors. Rendering: Leaflet 1.9.4.

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