|Start:||July 12, 1984 ||Observed|
|Stop:||July 12, 1984 ||Observed|
|Lahar, debris-flow, or mudflow: ||
|Tephra plume: ||
|Central eruption: ||
|MaxVEI: ||1 ||
|Duration: ||Less than one day ||
From Reeder (1987): "Pilot Tom Madsen observed a small ash and steam eruption of Mount Cleveland during one of his numerous flights to Atka of Atka Island from Dutch Harbor of Unalaska Island. His observation was made at about 1300 local time ( = GMT -9 h.) on 12 July 1984. The ash and steam plume was drifting to the southeast up to a 2,300 m altitude from a small southeast summit crater of the volcano. Some steam was also rising from the southeast side of the volcano. Some hot rock and/or debris had apparently gone down nearly the entire SE side of the volcano.
"Tom Madsen has flown in the Aleutians since 1980, and steam emission from the summit region of Mount Cleveland during this time was very common. Tom has on occasion observed small ash and steam eruptions like this one, but the exact dates of such previous eruptions are unknown."