Though I am no longer actively stage managing, living in Miami pretty much necessitates an up to date and extensive hurricane plan. Irene was staring us down for a while but tracked East. Nevertheless a good "practice run" of our company's emergency plan.
Distilled down, the main thing you will want to do as an SM is establish clear lines of communication and a clear timeline. The plan should be clearly communicated to everyone in the company several days prior to the event, and it should be clear who will activate the emergency plan (if necessary) and how they will communicate that. The nature of stage management is already very agile and well suited to these types of situations.
Think about how you will communicate with your team and the company after the storm if the internet, cell phones, power are out. Plan to not have these services for up to 72 hours after a storm. Obviously during the storm the only goal is to stay safe, however in the event of a severe storm you will likely need to resume daily life at some capacity before modern conveniences are fully restored.
On a personal level, have enough food and water for 72 hours. Think about what kind of food you will have, how will you cook if power is out? Canned foods, pre-cooked/frozen portions in a cooler? Flashlites and batteries for 72 hours (Hah! If you're a stage manager and don't have this already, maybe consider another career
). Have a battery operated radio and enough batteries for a few days, a first aid kit. In addition to your food and water... booze. Seriously. Not much else to do immediately after the storm, have a hurricane party.
Even a category 1 storm is nothing to sneeze at, especially in the Northeast where infrastructure is not built to withstand this type of weather (The thought of peoples' reaction to snow in Miami is terrifying). Be prepared and stay safe!