Yellow, Orange, Red: What Kerala Rain Alerts Actually Mean
Every monsoon the same undated screenshot goes around Kochi group chats. Here is what the four IMD colours mean, how much rain counts as heavy, where to check the real thing, and which numbers to save.
Every August the same sequence plays out in Kochi group chats. Someone forwards a screenshot with a red band across the top. Someone else asks whether schools are shut. A third person forwards it onward. By the time anybody checks the source, the alert turns out to be four days old and issued for a different district.
The system is not complicated. It is just that almost nobody reads it from the source.
What do the four alert colours mean?
The India Meteorological Department issues warnings in four colours, in ascending order of severity. Each carries an official warning level and an action phrase, and the phrase is more useful than the colour.
| Colour | Warning level | What you are being told to do |
|---|---|---|
| Green | No Warning | No action |
| Yellow | Watch | Be updated |
| Orange | Alert | Be prepared |
| Red | Warning | Take action |
Note what yellow is not. Yellow is a watch, and the instruction attached to it is to stay informed. It is not an instruction to cancel anything. Kochi spends a good part of the monsoon under yellow, and treating every one of them as an emergency is precisely how people train themselves to ignore the orange that actually matters.
Does an orange alert mean a fixed amount of rain?
No, and this is the most common misreading in every monsoon news cycle. IMD does classify rainfall by how much falls in 24 hours, measured 0830 to 0830 IST, and these categories turn up in the wording of a warning.
| Category | Rainfall in 24 hours |
|---|---|
| Heavy rainfall | 64.5 mm to 115.5 mm |
| Very heavy rainfall | 115.6 mm to 204.4 mm |
| Extremely heavy rainfall | 204.5 mm and above |
But the colour is not one of those bands. It is an impact based judgement for a whole district, weighing how widely the rain is spread, how long it has been falling, and whether the district is already in flood. Scattered heavy to very heavy rain can earn a red without any gauge recording 204.5 mm, and three straight days of isolated heavy to very heavy rain run orange, orange, then red on the third, with no change in the daily total.
So an orange alert broadly travels with very heavy rain, but read it as a statement about likely consequences rather than a promised number. It also means a district colour is not a reading for your own road. Kochi is perfectly capable of flooding one junction while a neighbourhood four kilometres away stays dry, and no district level colour can tell you which.
Where should you actually check?
- mausam.imd.gov.in and the Mausam app: IMD district warnings, where every forwarded screenshot originally came from
- sdma.kerala.gov.in: the Kerala State Disaster Management Authority daily alerts page, in English and Malayalam
The KSDMA page is the one worth bookmarking, because in Kerala in August a rain warning is rarely the only thing that matters. The same daily alerts section carries dam levels, lightning warnings, high wave and strong wind warnings and fishermen advisories.
One trap there. Dam alerts run on their own separate scale, blue for the first stage, orange for the second and red for the third. An orange dam alert is not an orange rain alert, and the two get conflated in forwarded messages every single season.
Which numbers should a Kochi household save?
Save these before you need them. Searching for a control room number while the power is out is a bad experience.
- Disaster management helpline, Collectorate: 1077
- Kerala State Emergency Operations Centre: 1070 or 1079, both dialled without an STD code, or 0471 2778800
- Fire and Rescue control room, Ernakulam: 0484 2205550
- Kochi City police control room: 0484 2359200
- Ernakulam Rural police control room: 0484 2621100
- KSEB control room: 0484 2392358
- Kerala Water Authority control room: 0484 2361369
- District Medical Officer control room, for health matters: 0484 2369567
The KSEB number is the one you will use most, and worth keeping alongside our guide to KSEB connections and tariffs.
What should an orange alert change about your day?
This is where the colours become practical rather than decorative. Under yellow, carry the umbrella and get on with your life. Under orange the instruction is to be prepared, and in a city built partly on reclaimed backwater that means something specific: move the car off low ground, charge the power bank while there is still power, do not park under the old tree by the compound wall, and leave earlier if your commute crosses Vyttila or the bypass. Under red, take action means take action, including not driving out to see what the flooding looks like.
The other half is source discipline, and it is the part Kochi is worst at. A forwarded screenshot with no date and no district is worthless. Alerts are revised daily and sometimes withdrawn, and an expired red circulating on Thursday does real harm, because it teaches people to discount the next real one. Open the source, check the date, check the district.
And if the answer is that the day is washed out anyway, we have things to do in Kochi when it will not stop raining, plus more practical city explainers in our guides.
Written By
Haila Kochi Editorial Team
Part of the Haila Kochi editorial team, covering the food, business, lifestyle, and people that make Kochi what it is.
