utopia
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Posts posted by utopia
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what do you mean 'provenance' ?
Origin / source. Can the number be produced by an equation such as can be done for adiabatic and pseudoadiabatic lapse rates? All I can find is a wiki article stating it is an average chosen for the ICAO ISA model.
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What is the provenance of the 6.5 K/km environmental lapse rate in the troposphere under ISA?
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Does anyone have a site archiving TAF/METAR/SPECI?
http://www.ogimet.com/index.phtml.en
Found one. Not an easy site to locate - posted here for benefit to others.
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Does anyone have a site archiving TAF/METAR/SPECI?
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Impressive stuff. Am I to take it that these gust fronts won't generally extend more than say 20 nm?
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How far in front of a thunderstorm can a gust front extend? And are there any key 'signatures' by which it can be unmistakenly identified?
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I want a blank graph for the skew-T.
For example, here's a blank T-phi: http://maths.ucd.ie/met/msc/Met-Labs/Colour-Tephigram.pdf
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Does anyone have a template skew-T to hand?
Isa Environmental Lapse Rate
in Spring Weather Discussion
Posted
John thanks for the reply. If you have a technical publication on precisely how the environmental lapse rate (-6.5 K/km) is derived I'd be very grateful.
I don't have a copy of ISO 2533:1975 or ICAO Doc 7488 but the freely available US Standard Atmosphere 1976 appear not to explain the figure (obviously all the usual hydrostatic and hypsometric equations are there but I can't see how the 6.5 K/km comes into existence).
Thanks.