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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 lower 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. Conversely, instability is increased when there is a mid-level dry layer (large dew point depression) known as an elevated mixed layer or "dry punch", which is favorable for convection if the lower layer is buoyant.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Dew_point_depression". A list of authors is available in Wikipedia.|