Secondary gravity waves are ripples in the atmosphere created when primary gravity waves, like those triggered by a volcanic ...

Above the havoc, a cloud of volcanic steam and ash rose 30,000 feet. Eruptions of steam, ash, and tephra continued until June 1917, when the volcano resumed its quiet profile, with minor steam ...

FCST VA CLD +12 HR: 28/0829Z NO VA EXP FCST VA CLD +18 HR: 28/1429Z NO VA EXP RMK: VOLCANO OCCASIONALLY VISIBLE THROUGH PASSING MET CLOUD. VOLCANO REMAINS ACTIVE BUT NO ASH SIGNAL DISCERNIBLE.