Wet snow and ice can multiply a branch's weight 30 times. Don't be the final ounce that cracks the limb.
Brush up and out to remove snow when a limb sags, or put a prop under the sagging limb to bear some of the weight until it melts away.
'Nuf said, right? To read more and to join in the discussion and snowy-plant-photo fest, go to Snow laden branches at our Forum.
For more about which limbs are at risk of breaking,and what you can do about it, read When ice and snow deal crushing blows, in What's Coming Up #195.
In the photo below is a full grown pyramidal yew (Taxus cuspidata 'Capitata') that can bear the weight. (Designers note: It's also a great look at what a yew can become if given room and allowed to grow. Most pyramidal yews we see are kept small, clipped into a cone.)