[gradsusr] Wind Barbs

[Andrew Revering]

Couple questions about wind barbs:

- Is it possible to plot 'nothing' where a calm wind barb would go? Right
now it shows a circle or a zero where calm wind is. I'd rather it plot
nothing in those locations.

- Also, the speed is incorrect in my wind barbs. I'm trying to plot it in
knots and I'm using: 'display u500;v500*1.94384'
The mag() function returns different values than what is being plotted for
my barbs, so apparently I'm not converting my wind barb from m/s to knots
properly. Thoughts?

Thanks,
Andy
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