On 9 May, AVO reported that an increasing number of thermal anomalies at Cleveland were visible on satellite imagery during the previous two weeks. A small ash plume rose to an altitude of below 4.6 km (15,000 ft) a.s.l. on 7 May. A ship N of Nikolski (75 km ENE) reported a dusting of ash around the same time. The Volcanic Alert Level remained at Advisory and the Aviation Color Code remained at Yellow.
Source: Alaska Volcano Observatory (AVO) – “Reports provided courtesy of the Smithsonian’s Global Volcanism Program and the US Geological Survey’s Volcano Hazards Program.”