|
meteoptic-l [ät] ursa.fi
message archive
This is meteoptic-l [ät] ursa.fi message archive.
Note, your can reply the messages on this page only if your
are already subscribed the list.
» To the end of the list/message
The association of green clouds with severe weather is a "solid" one. I'd
be suprised if there wasn't a comment on this topic in Weatherwise
magazine, since they frequently deal with questions from readers.
In general, my view is that the severe weather clouds that are green (and
I too have pictures) are quite low, and simply reflect (backscatter) the
green vegetation at ground level. Anyone seen green clouds above yellow
fields? I'm not sure I can buy the color via scattering off right sized
droplets hypothesis, since droplets are vastly larger than the wavelength
of light, and we enter Mie scattering range. Typically large particles
scatter white light. In a severe thunderstorm, the droplets are going to
be sized all over a alrge range, tending to imply that the resulting
scatter would be white. Of course, if the terrain below is green, then the
cloud will take on that sheen.
Alister.
My soul is an enchanted boat,
Which, like a sleeping swan, doth float
Upon the silver waves of thy sweet singing.
|