Zonal flow is a meteorological term meaning that the general flow pattern is west to east, or east to west, along the Earth's latitude lines (as opposed to meridional flow). Extratropical cyclones in this environment tend to be weaker, moving faster and producing relatively little impact on local weather.
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“The first principle of a free society is an untrammeled flow of words in an open forum.”
—Adlai Stevenson (19001965)