|Start:||May 5, 1997 ||Observed|
|Tephra plume: ||
From McGimsey and Wallace (1997): "On May 5, 1997, the U.S. Coast Guard relayed to AVO a PIREP of a steam and ash cloud rising from Cleveland at 1600 ADT. The USCG C-130 crew took video footage to document their observations. The activity was characterized by the pilots as profuse steaming from the summit crater with intermittent, pulsing, bulbous emissions of ash. Summit snow cover was distinctly marked with patches of black (either ash or bare ground) that extended down the flank, and the plume visibly extended for about 50 km (~30 mi) downwind. The activity appears similar to that reported in 1994 (Neal and others, 1995). AVO analysis of satellite imagery revealed a small hot spot. No information release was issued and AVO received no further information."