|Start:||September 21, 2003 ||Observed|
|Remobilized tephra - no eruption: ||
|Eruption Type:||Not an eruption.|
From McGimsey and others (2005): "On September 21, 2003, strong northwesterly winds sweeping through the VTTS in Katmai National Park entrained ash from the 1912 deposits to form a substantial cloud that was carried over Shelikof Strait, Kodiak Island, and the Gulf of Alaska. Particle fallout on Kodiak Island was mistaken as material from an eruption cloud. Upon receiving the reports from Kodiak, AVO scientists analyzed satellite imagery and area seismic data and determined that the phenomenon was non-eruptive in origin. The National Weather Service (NWS) was contacted to confirm the existence of strong winds in the area, and then AVO issued an Information Release at 2:30 pm ADT (22:30 UTC) explaining the cloud's source and cautioning that despite the non-eruptive origin, the cloud -- composed of remobilized volcanic ash -- nonetheless posed a potential hazard to aircraft."