Jeff,
A old problem with wind barbs & pennants not displaying correctly for Subregions of grids from the NOMADS sites is back again. They are backwards. I went back to the previous version of Ngrb2pcg32 released in Dec. 2005 and they display correctly. Not so with the new versions released this month including the one released yesterday (March 4).
Regards,
Kevin
Data source: http://nomad5.ncep.noaa.gov/ncep_data/
Model: GFS 0.5x0.5 degree (5 days)
Subregion I used:
left longitude: -105
right longitude: -70
top latitude: 50
bottom latitude: 20