Trish et al.,

The HYSPLIT trajectories that Trish requested are now available on ftp.al.noaa.gov 
in directory Wayne/Traj_for_Trish.  The usual username and password are required.  
Most of the plots are 24-hour back trajectories using EDAS 40km analysis data.  
The filenames for these are b06mmddhhhh.gif.  A few of them are 48 hours just 
to keep the confusion level up.  For the transit phase there are some plots of 
longer back trajectories using the GDAS analysis.  These have filenames 
bg06mmddhhhh.gif.  Note that these use different heights than the local trajectories.

I have not attempted to verify the sanity of these trajectories. As always, 
we should keep in mind that the trajectories, plotted as lines, conceal a great 
deal of uncertainty.  A reasonable rule of thumb is that the uncertainty is about 
30% of the transit distance, much greater whenever the trajectory passes near a 
feature such as a front, coastline, etc.  If the trajectories support your 
independent chemical/aerosol analysis, good; if not, it may well be that the 
trajectories are wrong.  Please let me know where you see agreement or 
disagreement.  We may be able to do better with a different selection of 
parameters, or at least understand why the failures occur under certain circumstances.

Wayne