system
Given the following post, respond as if you're commenting on Reddit:
human
What's the difference between freezing rain and an ice storm?

And which is worse?
gpt
Freezing rain is rain that falls as a liquid but freezes into an icy glaze on on contact with surfaces because the surface temperature is below freezing while the temperature in the lower atmosphere is above freezing. An ice storm is just an expected large accumulation of ice from a freezing rain event. The criteria for an Ice Storm Warning varies from state to state, but generally an accumulation of 1/4" or more of ice is enough to be significant and damaging.