In the instructions and literature that comes with the shingles it usually says to take extra measures if they are installed in high wind exposure areas, like the seashore or in your case, in the mountains. What they say to do, and what I have always done in high wind areas, is to put extra dabs of roof cement under each and every tab. It is easiest to use the calking tube style of the "black gook" to leave small dabs basically on top of the ones that come on the shingles already. This will hold the shingles down, no problem. You don't want a continuous bead, as that could trap water under the shingles. If it is cold out you may want to warm the tube a little first as it can be tough to squeeze it out when cold.