Definition of "advection" [advection]

• The transfer of a property of the atmosphere, such as heat, cold, or humidity, by the horizontal movement of an air mass: Today's temperatures were higher due to the advection of warm air into the region. (noun)
• The rate of change of an atmospheric property caused by the horizontal movement of air. (noun)
• The horizontal movement of water, as in an ocean current. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The low center at around 5000 feet passes to our north with little or no warm air advection to transport much moisture into the region."
• "The GFS, NAM and the latest European model all predict a period of light precipitation in association with warm air advection well out ahead of the main storm late Monday into Tuesday."
• "Also, instead of having the 850 mb (5000 ft) cyclonic (low pressure) circulation pass just to our south, the strong northern stream initially keeps any circulation at 850 mb well to our northwest so the region ends up in a broad region of warm air advection (winds from the south) which leads to warming."