Rainbow

The rainbow has had many meanings in many cultures, the main
similarity being that it is always connected with deities. In the
Christian Bible the rainbow was set in the sky as God's pledge that
there would never again be a great flood. In Burma the rainbow is a
dangerous spirit; in India it is a bow from which divine arrows are
fired. In Norse mythology the rainbow is the bridge that Odin built
from Midgard, the home of men, to Asgard where the gods lived, and
the souls of the worthy dead passed along the rainbow. In ancient
Rome the rainbow was the many-coloured robe of Isis, attendant to
Juno. It is lucky to see a rainbow, and to wish when it is first
seen, but unlucky to point directly at it, which will lead to bad
luck or at least to the return of the rain. In Ireland, anyone who
found the place where the rainbow touches the ground would find a pot
of gold at its foot.

A rainbow in the morning means further rain during the day, but a
rainbow appearing late in the day means the rain is gone for the rest
of that day. Small broken pieces of rainbow appearing on a cloudy sky
are sometimes called Weather-galls, and signify storms and blustery
weather.

Rainbow Weather Lore: If a rainbow fades very quickly, good weather
is on the way. A rainbow generally means that the rainy period is
about to end.