air mass


Definition of air mass

: a body of air extending hundreds or thousands of miles horizontally and sometimes as high as the stratosphere and maintaining as it travels nearly uniform conditions of temperature and humidity at any given level

Examples of air mass in a Sentence

Recent Examples on the Web The warm air mass will stick around one more day before starting to recede on Wednesday as the cold front heads across the country. Janice Dean, Fox News, "Heavy snow impacts Rockies, Upper Midwest as record warmth roasts eastern third of US," 10 Nov. 2020 The week ahead will continue to see daytime temperatures in the 60s and overnight lows in the 40s and 50s, thanks to a cold air mass moving through the region. Hayley Smith, Los Angeles Times, "L.A. chills out as cold snap breaks record days of warm weather," 9 Nov. 2020 The inversion is limiting the normal mixing of the air mass. oregonlive, "Portland metro Friday weather: Stagnant air advisory lingers through Monday," 2 Oct. 2020 An unusually cold air mass across the Rockies and Central Plains will help fuel this wintry event. Brandon Noriega, Fox News, "Major winter storm bringing snow, freezing rain into Plains as California faces extreme fire risk," 26 Oct. 2020 Although Zeta remains hundreds of miles from the state, a moist air mass stretching northeast of the storm was drenching South Florida, National Weather Service spokesperson Pablo Santos said. Robin Webb,, "Hurricane Zeta forms along a track toward storm-weary U.S. Gulf coast," 26 Oct. 2020 It’s a rather raw marine air mass, with daytime highs only in the low-to-mid 50s most spots. Ian Livingston, Washington Post, "PM Update: Saturday cold front caps unusual streak of late October warmth, then it’s a chilly Sunday," 23 Oct. 2020 These are denoted by alternating flags and semicircles (alternating in the same colors outlined above), each pointing toward their respective air mass. Dennis Mersereau, Outside Online, "How to Read a Surface Weather Map," 15 Oct. 2020 These days dominated by a marine air mass are notoriously tricky. Ian Livingston, Washington Post, "D.C.-area forecast: More pleasant than not in the days to come," 12 Sep. 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'air mass.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of air mass

1882, in the meaning defined above

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Time Traveler for air mass

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The first known use of air mass was in 1882

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Statistics for air mass

Last Updated

30 Nov 2020

Cite this Entry

“Air mass.” Dictionary, Merriam-Webster, Accessed 5 Dec. 2020.

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