Odd plot of wind vectors

Hi:

I have a regional model output (100m resolution). When I ploted an area about 30x30km (plot_1.png attached) using plot_1.ncl, the plot seems OK. However, when I tried to plot an area about 10x10km within the 30x30km area, the plotted wind vectors are quite odd (plot_2.png by plot_2.ncl), and wind vectors were not plotted in most areas. Can anyone help me fix the problem? Thanks!

Ed

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