For clarity:  The Hazard rules in Revised add an extra table for rolling the consequences.  But where I say the GM is free to invent hazards on the fly see page 161 of the Revised rules.  There is a list of sample Hazard Episodes used as illustrations and the GM is specifically directed to “tailor a Hazard event to the current adventure and its circumstance”.  The sample list is clearly not exhaustive because it doesn’t cover every possible combination of role and consequence.