In addition to Charlie's answer on building a shelter:

**Make sure you don't have to move once the storm hits.**

You'll likely hardly be able to walk around safely, so make sure you're in the best spot already.

* Stay well above the waterline to avoid *raising rivers/flash floods*.
* Stay away from canyons that could be dangerous because of *avalanches/mudslides*.
* Stay away from any trees (at the wind speeds you're describing also avoid forests!)
* Keep some distance from cliffs (unless you can get inside some cave/crack) because of *rockfall*.
* Winds of these strengths could well be coming with a thunderstorm, so keep the usual [*lightning* protection advice][1] in mind.


**Make sure you'll be warm enough**

Trying to mess about with your equipment in these conditions might be rather hard, do prepare as well you can:

* Put on enough layers of clothing (insulation, wind/rain protection)
* In extreme cases you could improvise a bivouac by wrapping a tarp/tent floor/tent fly around you before crouching behind your shelter.
* Have enough snacks/drinks ready (e.g. make some hot tea in preparation)

  [1]: https://outdoors.stackexchange.com/questions/10215/protect-yourself-from-a-lightning-strike