policy statement A Policy Statement of the American Meteorological Society as adopted by the Council on 5 January 1992 1. Introduction and their application to the measurement of super- cooled liquid water (SLW) has revealed the existence Humans modify the weather deliberately and unin- of low altitude SLW within winter orographic clouds tentionally; this is well founded in both theory and above the crestlines of mountain barriers. Aircraft- observation. Evidence accumulated over the last 40 based sensing platforms often fail to detect low-level years suggests that certain local weather conditions SLW because aircraft cannot safely fly sufficiently including fogs, low clouds, and precipitation in some close to the mountain barriers. Vertically pointing areas can be altered by carefully controlled cloud radiometers sited at or near barrier crestlines have seeding. Similarly, the effects of inadvertent weather often observed quantities of SLW sufficient to give modification are becoming better understood. Cities useful additional snowfall if successfully precipitated and industrial complexes affect local weather condi- by cloud seeding. tions and alter precipitation. Regional weather changes Multiparameter radars, which can distinguish be- result from other human activities such as deforesta- tween liquid and ice-phase hydrometeors in clouds, tion and vehicle traffic on major
Bulletin of the American Meteorological Society – American Meteorological Society
Published: Mar 1, 1992
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