[gradsusr] station data when all undef time series with wind barbs

[Luan Jia]

'd const(s2g1d(u10(stid='id.sn')),0,-a);s2g1d(maskout(u10(stid='id.sn
'),500-u10(stid='id.sn')))*2.5;s2g1d(maskout(v10(stid='id.sn
'),500-v10(stid='id.sn')))*2.5'

when all data 999,
[image: Inline image 1]

 Any help would be greatly appreciated...thanks!
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