Damaging wind and snow storms have long been a way of life in the islands. Fortunately, the past 15 years or so have seen only a few memorable storms. Unfortuantely, this means many new arrivals to the islands haven't learned the lessons that come from being without power for a week or more and not being able to get to town.
First Step: ensure you are prepared to be on your own for a week.
And specific info for winter weather:
Windstorm: What to do Before and During a Windstorm
Winter Weather: Winter Weather Wisdom for San Juan County
How to Prevent and Respond to Feezing Pipes (courtesy of Eastsound WUA): Winter Storms and Your Water Service
What a PNW Windstorm Can Look Like: read up on the 1962 Columbus Day Storm
Use of a Generator: helpful tips from OPALCO