Re: Metric wind barbs

From: Jack Glendening <ncarg_drjack_at_nyahnyahspammersnyahnyah>
Date: Tue Dec 01 2009 - 18:20:43 MST


Thanks, that's the best explanation I've seen so far, and makes sense in
that the difference between knots and m/s is only 3% so metric and
non-metric barbs are comparable within observation/prediction error.


Andrew Wiebe wrote:
> Appendix II-4, Manual on the Global Data-Processing and Forecasting
> System WMO-No. 485
> "2.2 The following rules determine the symbols to be used for the
> plotting of the various upper-air observation elements
> which appear on the constant pressure charts.
> (a) The wind at the level of the chart should be plotted with a solid
> shaft touching the station circle, the barbs and
> solid pennants flying to the left of the wind shaft in the northern
> hemisphere and to the right of the wind shaft
> in the southern hemisphere. The full barbs represent 5 m s-1 or 10
> knots, the half-barbs represent 2.5 m s-1 or 5
> knots, and the solid pennant represents 25 m s-1 or 50 knots."

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Received on Tue Dec 1 18:20:51 2009

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