The IMD has four colour–coded warnings based on the intensity of an extreme weather event and issues them in the ascending order of green, yellow, orange, and red

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                         The India Meteorological Department (IMD)  issues four colour codes to indicate various categories of alerts. Here is what each alert means:

Green (All is well):  No advisory is issued

Yellow (Be aware): Severely bad weather is possible over the next few days, plan ahead thinking about possible travel delays and disruption of day-to-day activities possible. It indicates the weather may change or worsen in the next few days.

Amber (Be prepared): There is an increased likelihood of extremely bad weather, which could potentially cause travel delays, road and rail closures, and interruption of power supply. There could be risk to life and property. Amber means people need to be prepared to change plans and protect themselves, their family and community from the impacts of the severe weather based on the forecast from the Met Office.

Red (Take action): Extremely bad weather is expected. People need to take action to keep themselves and others safe. Widespread damage, travel and power disruption and risk to life are likely. People must avoid dangerous areas and follow the advice of the emergency services and local authorities.
IMD chief Mrutyunjay Mohapatra