U.S. Geological Survey
Sunday, November 5, 2023, 7:10 AM AKST (Sunday, November 5, 2023, 16:10 UTC)

KATMAI (VNUM #312170)
58°16'44" N 154°57'12" W, Summit Elevation 6716 ft (2047 m)
Current Volcano Alert Level: NORMAL
Current Aviation Color Code: GREEN

Strong northwesterly winds in the vicinity of Katmai and the Valley of Ten Thousand Smokes have picked up loose volcanic ash erupted during the 1912 Novarupta-Katmai eruption and are carrying it to the southeast this morning. The National Weather Service has issued a SIGMET for this low-level event and suggests that the maximum cloud height is 5,000 ft (1.5 km) above sea level.

This phenomenon is not the result of recent volcanic activity and occurs during times of high winds and dry snow-free conditions in the Katmai area and other young volcanic areas of Alaska. No eruption is in progress. Trident Volcano remains at color code YELLOW due to elevated earthquake activity, while other volcanoes of the Katmai area (Snowy, Griggs, Katmai, Novarupta, Mageik, Martin) remain at color code GREEN. Resuspended volcanic ash should be considered hazardous and could be damaging to aircraft and health.

For more information on volcanic ash and human health, visit the following website:

Official warnings about these ash resuspension events are issued by the National Weather Service:

Forecasts of airborne ash hazard to aircraft: Volcanic Ash Advisories:

Forecasts of ashfall:

Air quality hazards and guidance from Alaska Department of Environmental Conservation, Division of Air Quality:


Matt Haney, Scientist-in-Charge, USGS (907) 786-7497

David Fee, Coordinating Scientist, UAFGI (907) 378-5460

The Alaska Volcano Observatory is a cooperative program of the U.S. Geological Survey, the University of Alaska Fairbanks Geophysical Institute, and the Alaska Division of Geological and Geophysical Surveys.

Hazard Notification System (HANS) for Volcanoes at