Difference between revisions of "Rain"

From Glossary of Meteorology
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<div class="definition"><div class="short_definition">[[Precipitation]] in the form of liquid water drops that have diameters greater than 0.5 mm, or,  if widely scattered, the [[drops]] may be smaller.</div><br/> <div class="paragraph">The only other form of liquid precipitation, [[drizzle]], is to be distinguished from rain in that  [[drizzle drops]] are generally less than 0.5 mm in diameter, are very much more numerous, and  reduce [[visibility]] much more than does light rain. For observing purposes, the [[intensity]] of [[rainfall]]  at any given time and place may be classified as 1) "light," the rate of fall varying between a [[trace]]  and 0.25 cm (0.10 in.) per hour, the maximum rate of fall being no more than 0.025 cm (0.01  in.) in six minutes; 2) "moderate," from 0.26 to 0.76 cm (0.11 to 0.30 in.) per hour, the maximum  rate of fall being no more than 0.076 cm (0.03 in.) in six minutes; 3) "heavy," over 0.76 cm (0.30  in.) per hour or more than 0.076 cm (0.03 in.) in six minutes. When [[rain gauge]] measurements  are not readily available to determine the [[rainfall intensity]], estimates may be made according to  a descriptive system set forth in observing manuals.</div><br/> </div>
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<div class="definition"><div class="short_definition">[[precipitation|Precipitation]] in the form of liquid water drops that have diameters greater than 0.5 mm, or,  if widely scattered, the [[drops]] may be smaller.</div><br/> <div class="paragraph">The only other form of liquid precipitation, [[drizzle]], is to be distinguished from rain in that  [[drizzle drops]] are generally less than 0.5 mm in diameter, are very much more numerous, and  reduce [[visibility]] much more than does light rain. For observing purposes, the [[intensity]] of [[rainfall]]  at any given time and place may be classified as 1) "light," the rate of fall varying between a [[trace]]  and 0.25 cm (0.10 in.) per hour, the maximum rate of fall being no more than 0.025 cm (0.01  in.) in six minutes; 2) "moderate," from 0.26 to 0.76 cm (0.11 to 0.30 in.) per hour, the maximum  rate of fall being no more than 0.076 cm (0.03 in.) in six minutes; 3) "heavy," over 0.76 cm (0.30  in.) per hour or more than 0.076 cm (0.03 in.) in six minutes. When [[rain gauge]] measurements  are not readily available to determine the [[rainfall intensity]], estimates may be made according to  a descriptive system set forth in observing manuals.</div><br/> </div>
 
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Latest revision as of 17:44, 25 April 2012



rain

Precipitation in the form of liquid water drops that have diameters greater than 0.5 mm, or, if widely scattered, the drops may be smaller.

The only other form of liquid precipitation, drizzle, is to be distinguished from rain in that drizzle drops are generally less than 0.5 mm in diameter, are very much more numerous, and reduce visibility much more than does light rain. For observing purposes, the intensity of rainfall at any given time and place may be classified as 1) "light," the rate of fall varying between a trace and 0.25 cm (0.10 in.) per hour, the maximum rate of fall being no more than 0.025 cm (0.01 in.) in six minutes; 2) "moderate," from 0.26 to 0.76 cm (0.11 to 0.30 in.) per hour, the maximum rate of fall being no more than 0.076 cm (0.03 in.) in six minutes; 3) "heavy," over 0.76 cm (0.30 in.) per hour or more than 0.076 cm (0.03 in.) in six minutes. When rain gauge measurements are not readily available to determine the rainfall intensity, estimates may be made according to a descriptive system set forth in observing manuals.