"'It wasn't that bad when he left the yard officer'"
If I was checking such a risk assessment I would expect to see under "Special Measures - Where high winds are forecast within xx miles of the planned route the duty fleet manager will obtain detailed local weather forecast from (an accredited forecasting agency). Where such a forecast is not already in writing, e.g. fax or download, the call must be logged.
If such a forecast shows winds in excess of xx mph drivers are expected to ............." (you cannot actually tell a driver what to do in such circumstances, like the captain of a ship, he is in charge at the scene, but like any other worker he must be prepared to justify any deviation from the recommended H&S procedure. It is a defence to show that alternative arrangements were necessary and adequate to meet changed circumstances)
Believe me, I've risk assessed government funded ice/winter climbing expeditions by student parties in the Highlands, and I wouldn't have lasted long if I'd tried to stop that funding coming in by banning the activity. Risk assessing weather affected activities does require some thought, but it's not difficult, even for a leader, let alone a trained H&S professional.