Triangle warning light came on now off, cancel dealer appt?

[Blinker]

There is a malfunction in one of the sensors most likely. Could be a TPMS sensor going bad, or it could also have been a blockage on one of the radar sensors if this vehicle is equipped.

 

[Hall]

Could be a TPMS sensor going bad, or it could also have been a blockage on one of the radar sensors if this vehicle is equipped.

If a sensor is bad, the "tire!" light should be flashing. I agree that it was (probably) something (ice or frost) blocking a sensor that melted off.