Closely related to what you are looking for and what I think is a
really neat site is the following:

http://www.arl.noaa.gov/ready/traj_neus.html

which gives forward and backward trajectories. In other words, you
can see where parcels of air originated that are arriving at/near your
location. Take a look at it and play with it for a while. You can
also see where aprcels orininating at/near your locale will be in 36
hours. Useful stuff and Its cool!

In fact, the READY (arl) site on the whole is an excellent WX site to
bookmark and look over!

Jot


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