During winter here in the northern hemisphere the sun rises from the southeast and sets to the southwest. In Yosemite Valley this means that the rock formations on the north side of the valley, like El Capitan, Three Brothers (right), and Yosemite Falls, get hit by the sun early and late in the day, while the south side of the valley, including Sentinel Rock, Cathedral Rocks, and Bridalveil Fall, gets little sunlight. Half Dome receives nice sunset light all year, but in winter this late-day illumination rakes across its face, amplifying the texture of the rock.
February is a transition month as we approach spring. Sentinel Rock and Bridalveil Fall start to get some late-day light. The waterfalls have just a little more flow than in December and January. In February Upper Yosemite Fall often has a nice combination of early morning sun and a decent amount of water. Of course there's the famous sunset light on Horsetail Fall.
The forecast calls for rain and higher elevation snow later this week. Storms, whether they bring rain or snow, always provide opportunities for great clearing storm photographs.