Snow and winter weather is officially signaling the beginning of winter which means some services will be closing until next spring. Currently the Mariposa Grove Gift Shop is now closed for the season. Also, the RV sanitary dump at Wawona is closed for the season. If you should need to use the RV dump station please use the one in Yosemite Valley.
As more snow precipitates you can expect the gates to the Mariposa Grove to close, the Glacier Point and Tioga Roads to close and many trails leading from the Valley to higher elevations to also close.
If you do decide to go into the back country or hike in the snow be sure to take adequate winter clothes, food and water. Leave an itinerary with where you are going and the exact date you plan to return. Leaving a photo of what you in your gear (takes 5 seconds at home) with your itinerary will also help searchers should you become lost. Make sure the person you leave your itinerary with is trustworthy and knows to call if you do not show up on time. That minute you save being rescued could mean life or death.