Contrails and Aviation-induced Cirrus Clouds
(still to be edited and distributed over the pages)
Contrails an aviation-cirrus can be an early sign of a storm:
From SAIL Magazine's Sailing Tip of the Week:
Continuing Good Weather:
Clear, light blue to dark blue. Bright moon. Jet contrail disappears immediately
or doesn't form.
Large halo circling moon or sun. Jet contrail lingers thickly before falling
Several scientific studies are also being conducted with respect to contrail
formation and their climatic effects. "Cirrus clouds affect Earth's climate
by reflecting incoming sunlight and inhibiting heat loss from the surface.
Ordinarily, cirrus clouds are only weakly influenced by most ground-based human
activities, because of their high altitude. However, increasing levels
of high-altitude jet air traffic may alter the regional climatic effects of
cirrus because aircraft condensation trails (contrails) often produce new
cirrus, which could differ in their radiative properties."
Weather Diary Photo
includes some extra views of
and some you may have missed
cirrus also act as natural cloud seeder and strongly modulate the
radiatively-important upper tropospheric water vapor budget.
(The link to NASA's webpage on this subject is no longer valid).