Originally Posted by FBinNY

No one is ever held responsible for an act of god. But the decision to go ahead in the face of a predicted storm can be viewed as poor judgement and actionable. This is why schools close when snow is forecast, dive and fishing boats don't leave port when there are small craft warnings (even in Mexico), and all manner of events are delayed or cancelled because of actual or predicted "dangerous" weather.

At the very least a ride sponsor would have to remind riders of the predicted hazards, and suggested proper responses. Remember, we live in a litigious society and ride sponsors don't allow helmetless participation, even from adults because they may be found liable for failure to effectively promote safety.