# The velocity of a cloud?

I noticed an unusually fast moving cloud this morning.

My questions:

• What is the average velocity of a cloud on Earth?

• What is the greatest ever recorded cloud velocity?

• What factors affect the velocity of a cloud? (e.g. do they experience inertia?)

• That reference compares cloud speed as measured from a satellite camera, versus wind speed measured at cloud base and various altitudes within clouds. A cloud is not a solid object. It is suspended droplets, and it can be vaporizing on one side and condensing on another, all as a function of altitude, temperature, and humidity. There is also considerable vertical motion. One thing I'm very skeptical of: droplets having velocity of $5 m/s$ relative to the air they are suspended in. – Mike Dunlavey Nov 30 '13 at 20:02