- Tephigram
A tephigram is one of four
thermodynamic diagrams commonly used inweather analysis and forecasting. The name evolved from the original name "T--gram" to describe the axes oftemperature (T) andentropy () used to create the plot. Usually, temperature anddew point data fromradiosonde s are plotted on these diagrams to allow calculations of convective stability orconvective available potential energy (CAPE). Wind barbs are often plotted at the side of a tephigram to indicate the winds at different heights.The tephigram was invented by
Napier Shaw in 1915 and is used primarily in theUnited Kingdom andCanada . Other countries use similar thermodynamic diagrams for the same purpose however the details of their construction vary. In the tephigram,isotherm s are straight and have a 45 degree inclination to the right whileisobar s are horizontal and have a slight curve. Dryadiabat s are also straight and have a 45 degree inclination to the left while moist adiabats are curved.The principal reason that tephigrams are used by the BritishMet Office is the property that areas contained by the curves have equal energies for equal areas, leading to better comparisons of CAPE and hence convective systems.ee also
*
Thermodynamic diagrams
*SkewT
*Emagram
*Stüve diagram References
* [http://homepage.ntlworld.com/booty.weather/metinfo/thdyndia.htm Thermodynamic diagrams]
Bibliography
* M K Yau and R.R. Rogers, "Short Course in Cloud Physics, Third Edition", published by Butterworth-Heinemann,
January 1 ,1989 , 304 pages. EAN 9780750632157 ISBN 0-7506-3215-1* J.V. Iribarne and W.L. Godson, "Atmospheric Thermodynamics, 2nd Edition", published by D. Reidel Publishing Company,
Dordrecht ,Holland , 1981, 278 pages, ISBN-10: 9027712972, ISBN-13:978-902771297External links
* [http://www.met.rdg.ac.uk/~sws97mha/Tephigram Department of Meteorology, University of Reading] page about tephigrams including pdfs of blank printable colour and monochrome tephigrams.
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