Just looking at the topography looks like downsloping from S, SE, E. As you and Alex know though you can reap the rewards on the Nw/N upslope flow.
HIE is known as the one of the biggest SE downslope pits I believe. Look at every 3k nam precip map, you could have March 93 redux coming up the coast and I swear it would print out .25" qpf for whitefield. It does the same for DDH, always a ridiculous minimum in any SE flow event. A bit overdone, but you get the idea.