Dublin Ireland lost the jib of a Wolffkran in a windstorm over night. No injuries were reported but a apartment had to be evacuated and a rail line halted. Early reports focused on weather vaning the crane.
When a tower crane is out of service the slewing (swing) brakes are opened so that the longer jib of the crane can point in the direction the wind is blowing and change directions with the wind. This keeps the crane profile as small as possible and since cranes are counterweighted then lean back, and weathervaning allows the crane to lean into the wind just like when we try to walk into the wind.