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 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)