I will use hurricanes in this example:
During Hurricane Zeta, it was reported that it was a Category 2 by the National Hurricane Center. Cat 2 - no big deal (for those who live on the coastal areas and understand surge vs wind speed and deal with this on a regular basis). A few days later, AFTER the storm had passed, they reclassified it as a Cat 3.
That type of information could have persuaded people to evacuate - at the very least, I would've sent my wife and kids away as I stayed.
We can call it "uncertainty" - or we can call it failure.