Dew point depression

The dew point depression (T-Td) is the difference between the temperature and dew point temperature at a certain height in the atmosphere.

The smaller the difference, the more moisture there is, and the higher the relative humidity. In the lower troposphere, more moisture (small dew point depression) results in lower cloud bases and is also important to severe thunderstorms.[clarification needed] Conversely, instability is increased when there is a mid-level dry layer (large dew point depression) known as a "dry punch", which is favorable for convection if the lower layer is buoyant.

As it measures moisture content in the atmosphere, the dew point depression is also an important indicator in agricultural and forest meteorology, particularly in predicting wildfires.

See also



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Look at other dictionaries:

  • dew-point spread — [do͞o′point΄, dyo͞o′point΄] n. the degrees of difference between the air temperature and the dew point: also called dew point deficit or dew point depression …   English World dictionary

  • dew-point spread — /dooh poynt , dyooh / the number of degrees of difference between the air temperature and the dew point. Also called dew point deficit, dew point depression. * * * …   Universalium

  • dew-point spread — /dooh poynt , dyooh / the number of degrees of difference between the air temperature and the dew point. Also called dew point deficit, dew point depression …   Useful english dictionary

  • depression of the dew point — the number of degrees that the dew point is lower than the temperature …   Useful english dictionary

  • Dew (disambiguation) — Dew is the condensation of atmospheric water vapor into droplets. Dew point is the air temperature at which dew will form. Dew point depression is an atmospheric weather term in meteorology. Dew pond, artificial pond for watering livestock Dew,… …   Wikipedia

  • Depression — De*pres sion, n. [L. depressio: cf. F. d[ e]pression.] 1. The act of depressing. [1913 Webster] 2. The state of being depressed; a sinking. [1913 Webster] 3. A falling in of the surface; a sinking below its true place; a cavity or hollow; as,… …   The Collaborative International Dictionary of English

  • Depression of the dewpoint — Depression De*pres sion, n. [L. depressio: cf. F. d[ e]pression.] 1. The act of depressing. [1913 Webster] 2. The state of being depressed; a sinking. [1913 Webster] 3. A falling in of the surface; a sinking below its true place; a cavity or… …   The Collaborative International Dictionary of English

  • Depression of the pole — Depression De*pres sion, n. [L. depressio: cf. F. d[ e]pression.] 1. The act of depressing. [1913 Webster] 2. The state of being depressed; a sinking. [1913 Webster] 3. A falling in of the surface; a sinking below its true place; a cavity or… …   The Collaborative International Dictionary of English

  • Depression of the visible horizon — Depression De*pres sion, n. [L. depressio: cf. F. d[ e]pression.] 1. The act of depressing. [1913 Webster] 2. The state of being depressed; a sinking. [1913 Webster] 3. A falling in of the surface; a sinking below its true place; a cavity or… …   The Collaborative International Dictionary of English

  • Angle of depression — Depression De*pres sion, n. [L. depressio: cf. F. d[ e]pression.] 1. The act of depressing. [1913 Webster] 2. The state of being depressed; a sinking. [1913 Webster] 3. A falling in of the surface; a sinking below its true place; a cavity or… …   The Collaborative International Dictionary of English

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