So far I have used the 3000m temperature (correlation = -0.64), the maximum ACV-ANC pressure gradient (+0.40), the depth of the temperature inversion aloft (+0.27), and the 2500-5000m shear (+0.49).
Using these variables weighted by their correlation, I have created an empirical formula with a correlation of +0.68 to the observed winds, and an average error of 4.8kts or 6.5%.
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