GOES-18 Ash RGB images (top) and SO2 RGB images (bottom), with plots of Pilot Reports and Volcanic Ash Advisory/Forecast polygons, from 1250-1910 UTC [click to play animated GIF | MP4]

GOES-18 (GOES-West) SO2 RGB and Ash RGB images (above) showed the complex transport of a volcanic cloud produced by an explosive eruption of Mount Shishaldin that began around 1350 UTC on 03 October 2023. The bulk of the higher-altitude volcanic cloud was rich in SO2 (shades of yellow in both RGB types), while a smaller mid-level portion that had high ash content exhibited shades of reddish-brown in the Ash RGB, and shades of blue to pink in the SO2 RGB images.

In Nighttime Microphysics RGB  + daytime True Color RGB images from the CSPPGeoSphere site (below), after sunrise the ash-rich portion of the volcanic cloud exhibited shades of tan to darker brown, as it moved to the south-southwest.

GOES-18 Nighttime Microphysics RGB + daytime True Color RGB images, from 1210-1940 UTC [click to play MP4 animation]

A radiometrically retrieved Volcanic Ash Height product from the NOAA/CIMSS Volcanic Cloud Monitoring site (below) indicated that parts of the volcanic cloud reached heights in the 18-20 km range (black enhancement) within 20 minutes of the eruption onset.

Volcanic Ash Height derived product [click to play animated GIF | MP4]

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