Yesterday I saw a roughly 25 deg from the sun rainbowlike halo, and a sundog while the sun was in a cirrus-cirrostratus-altostratus cloud.
12.
Frontal cirrostratus is a precursor to rain or snow if it thickens into mid-level altostratus and eventually nimbostratus as the weather front moves closer to the observer.
13.
The wispier cirrus clouds form close to the 50, 000-foot range, while the more overcast cirrus _ broad, dense sheets called cirrostratus _ form at around 20, 000 feet.
14.
Howard's original system established three physical categories or " forms " based on appearance and process of formation : " cirriform " ( mainly detached and wispy ), " cumuliform " or cirrostratus.
15.
In comparison, " regular " clouds-- like the wispy high flying cirrus and cirrostratus, or the low hanging nimbostratus and stratocumulus-- form within a moisture-laden zone that exists from several hundred feet up to 6 miles from the surface.
