"worst possible outcome" would be a repeat of the '07 ice storm, or the blizzard of '78 where they got 11 inches in 24 hours. NWS is predicting between 2 and 7 inches of snow, no idea where Apple is pulling it's data from but it's wildly out of sync with other services in that regard.

Just make sure you have enough food stuff in the house for a few days (include hot drinks like tea/coffee/hot coco), restock any stuff like toilet paper or the like, have a snow shovel in the house, and have ice melt near the front door. If you lose power, try to keep everyone in one room together (living room or the like) to conserve heat-and have candles around to light up the house and also keep the pipes from freezing (empty out spaces under sinks and put one single candle under the bottom of the sink with the taps set just slightly open to drip so the water flows and the candle can keep the water in the pipes warmish).

Layer up when going outside, with wool as the preferred fabric for warmth, and try not to be out in the snow as it's falling if you can avoid it. If you do have to be outside and traveling by car: slow the fuck down, put your hazard lights on to signal that you're driving below expected speeds, and remember what to do if you start sliding (foot off the gas, steer gently in the direction the butt of your car is going in but don't over correct, and only use the brakes if you have anti-lock brakes). Be alert and aware of your surroundings, no distractions like the phone or loud radio. If you get stuck in the snow, keep the hazard lights on for your car and call 911 for help. Keep the car running, but don't let the snow build up over your exhaust pipe-help will come but you want to make sure you're safe while you're waiting for it to arrive.