Another common misconception is that a tree swaying in the wind is dangerous. In fact, trees moving gently with the breeze are not necessarily unstable at all – they're simply trying to absorb the wind’s energy with subtle movement. If the branches didn’t sway, they would snap.
Rather than watching the swaying branches, look closely at the ground around the tree trunk for a clearer indication of any problems. If, on a windy day, you can spot signs of ground movement (‘heave’) or cracking, there may be genuine cause for concern. Look for raised soil opposite to the tree's natural lean, which could indicate uprooting.
Similarly, if a tree is precariously overhanging a road or building, don’t hesitate in seeking the advice of a professional tree surgeon or arboriculturist. Most commonly the tree will not have to be removed in its entirety – just the limbs causing the potential danger.