Tendency: Difference between revisions
From Glossary of Meteorology
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<div class="definition"><div class="short_definition">The local rate of change of a [[vector]] or [[scalar]] quantity with time at a given point in space.</div><br/> <div class="paragraph">Thus, in symbols, ∂''p''/∂''t'' is the [[pressure tendency]], ∂ζ/∂''t'' is the [[vorticity]] tendency, etc. Because of the difficulty of measuring instantaneous variations in the [[atmosphere]], variations are usually obtained from the differences in magnitudes over a finite period of time and the definition of tendency is frequently broadened to include the [[local time]] variations so obtained. An example is the familiar three-hourly pressure tendency given in [[surface weather observations]]; in fact, the term | <div class="definition"><div class="short_definition">The local rate of change of a [[vector]] or [[scalar]] quantity with time at a given point in space.</div><br/> <div class="paragraph">Thus, in symbols, ∂''p''/∂''t'' is the [[pressure tendency]], ∂ζ/∂''t'' is the [[vorticity]] tendency, etc. Because of the difficulty of measuring instantaneous variations in the [[atmosphere]], variations are usually obtained from the differences in magnitudes over a finite period of time and the definition of tendency is frequently broadened to include the [[local time]] variations so obtained. An example is the familiar three-hourly pressure tendency given in [[surface weather observations]]; in fact, the term "tendency" alone often means the pressure tendency.</div><br/> </div> | ||
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Latest revision as of 15:17, 20 February 2012
tendency
Thus, in symbols, ∂p/∂t is the pressure tendency, ∂ζ/∂t is the vorticity tendency, etc. Because of the difficulty of measuring instantaneous variations in the atmosphere, variations are usually obtained from the differences in magnitudes over a finite period of time and the definition of tendency is frequently broadened to include the local time variations so obtained. An example is the familiar three-hourly pressure tendency given in surface weather observations; in fact, the term "tendency" alone often means the pressure tendency.
