In 1991 it started snowing on Halloween and didn't stop for something like four days.
We had four feet of snow in our yard. The town was paralyzed for days.
My sister and I took three hours walking to the corner store and back. She had to walk behind me because she was too short to even break a path through the snow.
I'd just raise the temp slowly until it starts boiling. The only reason I can think it wouldn't be simmering at that temp is that the water has been boiled off, but that's almost certainly not the case here.
I enjoyed Wonder Man too.
I'd elaborate, but don't want to spoil it for others.