Walking on ice is generally a bad idea, but it’s especially bad when the ice is melting and the ground underneath it is unpredictable. In addition to that, there is a much higher chance of getting caught in an avalanche in warmer weather, so keep that in mind.
Rising River Levels
If river levels are rising, there is likely to be a high-pressure storm system moving in that can cause huge amounts of flooding if the river is high enough. Even if there isn’t a storm moving in, the higher a river level is, there will be a significantly higher chance of a flash flood happening.