meteorologists classify clouds based on XXXXX altitude (high, mid, XXX) XXX XXXXX XXXXXXXXXX (XXXXXX = wispy, XXXXXXX = XXXXXXX, XXXXXXX = puffy, XXXXXX = XXXX-XXXXXXX).
composed entirely of XXX XXXXXXXX XXX to freezing temperatures at XXXXXXX XXXXXXX.
composed XX water XXXXXXXX, XXX crystals, or a supercooled XXX of both.
dense XXXXXX primarily made XX liquid water XXXXXXXX.
nimbostratus: dark, thick, low-XX-XXX layer clouds that XXXXXXXXXX XXXXX the sun. they XXXX XXXXX warm or stationary fronts, bringing XXXXXX, XXXXXXXXX precipitation (XXXX or XXXX) that XXXXX XXX hours.
XXXXXXXXXXXX: