Several people are skating in a skating rink.  Perched above them is a lifeguard on a lifeguard chair.  There's also a safety cone in the middle of the ice
It's unusual to see a lifeguard setup like that unless it's at a beach or pool
What is that lifeguard doing there?
There's a warm front coming through this afternoon.
scene: an ice skating rink description: Several people are skating in a skating rink. Perched above them is a lifeguard on a lifeguard chair. There's also a safety cone in the middle of the ice uncanny: It's unusual to see a lifeguard setup like that unless it's at a beach or pool entities: Lifeguard, Ice_rink. caption: There's a warm front coming through this afternoon.
The joke is that a lifeguard, a safety measure at a pool, could be required if the ice rink melted into water. However, a warm front, even in the winter, probably wouldn't be enough to melt the ice rink and turn it into a pool. Nonetheless, the lifeguard, unusually placed at the rink, believes this might happen.