...color. 7. Nimbus. Rain clouds. Dense masses of dark formless clouds with ragged edges. 8. Cumulus. Woolpack clouds. Thick clouds whose summits are domes with protuberances but whose bases are flat. 9. Cumulus-nimbus. Thunder cloud, shower cloud. Heavy masses of clouds, rising like mountains, towers...

...summits arc domes with protuberances, but whose bjscs are flat. These clouds appear to form in a <liurnal ascensional movement which is almost always apparent....the surfaces which are usually seen by the observer arc more brilliant than the edges of the protuberances. \Vhen the illumination comes from the side...

...are floating much below a great nimbus, they may be called fracto-nimbus (the 'scud' of the sailorsl. CUMULUS (Cu.). Woolpack clouds. Thick clouds, whose...apparent. When the cloud is opposite the sun, the surfaces v/hich are usually seen by the observer arc more brilliant than the edges of the protuberances. When...

...upper surfaces, which show protuberances, and horizontal bases. These clouds appear to be formed by a diurnal ascensional movement which is almost always...apparent. When the cloud is opposite the sun, the surfaces seen by the observer are brighter than the margins of the protuberances. When the light falls from...

...circumstances is generally light and not of long continuance. Cumulus. — One-half mile to 2 miles high. Woolpack clouds. Thick clouds whose summits are domes with protuberances but whose bases are flat. When the cloud is opposite the sun the surfaces usually seen by the observer are more brilliant than...

...ranges from four to six miles and its movement, like cirrus and cirro-stratus, is quite rapid. ('amain* (Cu.). — Woolpack clouds. Thick clouds whose summits are domes with protuberances, but whose bases arc flat. These clouds appear to form in a diurnal ascensional movement which is almost always apparent....

...itiul not of long continuance. Cumulus. — One-half mile to 2 miles high. Woolpack clouds. Tliiok clouds whose summits are domes with protuberances but whose bases are flat. When the cloud is opposite the sun the surfiu'es usually seen by the observer are more brilliant than...

...under such circumstances is generally light and soon over. Cumulus. — One-half mile to 2 miles high. Woolpack clouds. Thick clouds whose summits are domes with protuberances, but whose bases are flat. When the cloud is opposite the sun the surfaces usually seen by the observer are more brilliant than...

...nimbus, the former may be called Fracto-nimbus ("Scud" of the sailors). (8) CUMULUS (Cu.).— Piled clouds. Thick clouds whose summits are domes with...usually seen by the observer are more brilliant than the e*lges of the protuberances. When the illumination comes from the side, this cloud shows a strong actual...