Diurnal

adj. Daily; pertaining especially to actions that are completed within 24 hours and are repeated every 24 hours (Whiteman 2000).

 

  • Discussion

 

The diurnal variability of nearly all of the meteorological elements is one of the most striking and consistent features of the study of weather.

 

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The diurnal variations of important elements at the earth's surface can be summarized as follows: 1) temperature maximum occurs after local noon and minimum near sunrise; 2) relative humidity and fog are the reverse of temperature; 3) wind generally increases and veers by day and decreases and backs by night; 4) cloudiness and precipitation over a land surface increase by day and decrease at night; over water, the reverse is true but to a lesser extent; 5) evaporation is markedly greater by day; 6) condensation is much greater at night; and 7) atmospheric pressure varies diurnally or semi-diurnally according to the effects of atmospheric tides. (AMS 2000)

 

  • See Also

     

  • References

    • American Meteorological Society (AMS). 2000. Glossary of Meteorology. [Online]. Available: http://amsglossary.allenpress.com/glossary.

    • Whiteman, David C. 2000. Mountain Meteorology: Fundamentals and Applications. New York, NY: Oxford University Press, Inc. 355 pp.

     

  • Notes

    • Author 

      Charles W. McHugh, Fire Spatial Analyst

      Rocky Mountain Research Station