This snippet from this mornings MWN discussion is impressive.
As far as wind chill values, if we go with a milder and less gusty setup of 33F below and winds of 95 mph, summits will have values around 87F below. If we go with a colder, windy setup of 40F below and 110 mph, summits will have values around 101F below. Either way, this means frostbite could start to develop on exposed skin in as little as 5 minutes or, at the extreme end, less than 1 minute. With this in mind, make sure to have someone check for any exposed skin or use a mirror or selfie cam to look for any gaps or holes in clothing, especially around where gear meets like goggles around balaclavas or jackets with pants or gloves with coats. It is far easier to maintain heat than it is to regenerate it. Bear in mind that the cold ambient air temperatures will affect anything with batteries shortening their available power or possibly not powering items on at all. Fuels, like those with camp stoves, may struggle or not operate as their pressurization alters or the fuel gels or freezes. Motorized vehicles you left at trailheads could see their batteries affected and their fuels and fluids could also gel or freeze.