feet up, can bo up to 180 miles an lyinfluence ems over s, yet tence  suspected untilpilots began to fly into t deal ofatmospood. A form of ion popularly knourbulence occasionally enlivens airplane flig ty sucs a yearare serious enougo need reporting. t associated ructures oranyt can be detected visually or by radar. t pockets of startlingturbulence in tranquil skies. In a typical incident, a plane en route fromSingapore to Sydney ral Australia in calm conditions —enougo fling unsecured people against twelve peoplewere injured, one seriously. No one knows w causes sucive cells of air.

    t moves air around in tmosp drives ternal engine of t, namely convection. Moist, orial regionsrises until it s tropopause and spreads out. As it travels aor and cools, it sinks.  s bottom, some of to fill and or, completing t.

    At tor tion process is generally stable and tably fair,but in temperate zones tterns are far more seasonal, localized, and random, tle betems of ems are created by rising air, o tually rain. arm air can ure tropical andsummer storms tend to be t. tend to be associated , itoften becomes manifest in tance, stratus clouds—tureless spra give us our overcast skies—ure-bearing updraftslack to break table air above, and instead spread out, likesmoke ting a ceiling. Indeed, if you cime, you can get a very goodidea of cte in a still room. Atfirst, it goes straigo impress anyone), and t spreads out in a diffused, est supercomputer in takingmeasurements in t carefully