OK, now that I have figured out how to get my vector fields in qgis, I can't figure out how to reduce the number of vector arrows on the map. Is there a setting for how many vectors are sampled? Thanks.
Oh well, I found a workaround by only putting every fifth data point into the csv file with my python program (exports netcdf to csv). Not ideally what I'd like to do, but I was in a hurry.