Depending on the magnitude of the meteorological parameters and the intensity of the associated events, three categories (colors) of alerts are introduced:
1) Yellow (low level warning)
2) Orange (medium level warning)
3) Red (high level warning)

All the warnings refer to the 6-hour period ending at the indicated time (e.g. a warning for the 21:00 Local time refers to the period 15:00-21:00 Local time).