All 3 Uses of

tempestuous
in
The Count of Monte Cristo

He saw overhead a black and tempestuous sky, across which the wind was driving clouds that occasionally suffered a twinkling star to appear; before him was the vast expanse of waters, sombre and terrible, whose waves foamed and roared as if before the approach of a storm.†
Chpt 22-23 *

In a moment he restrained himself so powerfully that the tempestuous heaving of his breast subsided, as turbulent and foaming waves yield to the sun's genial influence when the cloud has passed.†
Chpt 93-94

It was a lovely starlight night—they had just reached the top of the hill Villejuif, from whence Paris appears like a sombre sea tossing its millions of phosphoric waves into light—waves indeed more noisy, more passionate, more changeable, more furious, more greedy, than those of the tempestuous ocean,—waves which never rest as those of the sea sometimes do,—waves ever dashing, ever foaming, ever ingulfing what falls within their grasp.†
Chpt 111-112

Definition:

strongly turbulent -- as of a storm or unstable emotions