9. A peculiar appalling appearance in this bank, more particularly
as if it were a solid wall, drawing down upon and closing around
the ship.
10. A darting forward of portions of this bank, as if torn
into rags and shreds by some violent force, and driven before,
not borne, by the wind. When this indication
is distinctly recognized, a run of about two hours toward the
center will involve the vessel in a destructive hurricane.
11. A peculiar motion exhibited by small bodies, as branches
of trees when agitated by the wind, consisting of an apparent
whirling, not a bending forward, as if bent by a stream of air.
12. Lightning of a remarkable columnar character, shooting up in
stalks from the horizon with a dull glare; also like flashes from
a gun, and sparks from a flint and steel.