[Tutor] grb.select for multiple times

[Jason Snyder]

I have a grib2 file with wind data at multiple taus as shown below:

3:485167:d=2017030112:UGRD:10 m above ground:3 hour fcst:
8:1652471:d=2017030112:UGRD:10 m above ground:6 hour fcst:
13:2704909:d=2017030112:UGRD:10 m above ground:9 hour fcst:
18:3865964:d=2017030112:UGRD:10 m above ground:12 hour fcst:
23:5030535:d=2017030112:UGRD:10 m above ground:15 hour fcst:
28:6089549:d=2017030112:UGRD:10 m above ground:18 hour fcst:
33:7148742:d=2017030112:UGRD:10 m above ground:21 hour fcst:
38:8216961:d=2017030112:UGRD:10 m above ground:24 hour fcst:
43:9390488:d=2017030112:UGRD:10 m above ground:27 hour fcst:


Now what I would like to do is plot these wind values at the different taus
in a time series.  I have tried to work with the following code:

grbs=pygrib.open(grib)
uwind = grbs.select(name='10 metre U wind component')
uwnddata=uwind.values

however I am not able to from this code get a list of the uwind values over
the period of time from 3 to 27 hours at 3 hour intervals.  How can I tweak
the code to get this desired result?