Description: From Orr and others, 2023: "Thermal anomalies and a small summit steam plume appeared occasionally in satellite imagery over the following several months. Clear satellite views in August 2019 showed that a pit, centered on the January dome, had formed since February. More satellite imagery acquired in early November indicated uplift of the new summit dome. Because this uplift was coincident with an apparent increase in the brightness of the summit thermal anomaly and a more robust steam plume, AVO raised the Aviation Color Code and Volcano Alert Level to ORANGE and WATCH. Subsequent satellite imagery, however, showed that the uplift was an artifact from the satellite viewing angle and was not real. The Aviation Color Code and Volcano Alert Level for Mount Cleveland were returned to YELLOW and ADVISORY on November 15, where they remained for the rest of the year. The repose period of 2019 marked the longest at Mount Cleveland since its onset of eruptive activity in 2001."
From Orr and others, 2024: "The character of volcanic activity at Mount Cleveland in late 2019 - low seismicity, occasional thermal anomalies, and a small summit steam plume (Orr and others, 2023) - carried over into 2020, and Mount Cleveland began the year at an Aviation Color Code and Volcano Alert Level of YELLOW and ADVISORY. No changes within the summit crater were observed during the first several months of the year; elevated surface temperatures and a weak steam plume were observed sporadically during periods of clear weather. The low level of thermal activity was corroborated by high-resolution satellite imagery in April and May that showed a partly snowcovered dome, suggesting the surface was cold.
"Because of the apparent quiescence at Mount Cleveland, its Aviation Color Code and Volcano Alert Level were changed to UNASSIGNED on May 7 at 23:37 UTC (14:37 HADT)."