PAGASA Rainfall Warning Colours (Yellow, Orange, Red, Class Suspension)

A rainfall warning is a measurement, not a prediction. That single distinction explains almost everything people get wrong about the yellow, orange and red system.

A wind signal says what the wind is expected to do over the next day or two. A rainfall warning says what is falling right now and what is expected within the next few hours over a much smaller area. They run on different clocks, they cover different sized boxes on the map, and the rainfall one changes far faster — which is why the colour you checked at breakfast tells you very little by lunchtime.

The system it belongs to has three colours, and knowing which one you are looking at is more useful than knowing whether a typhoon exists.

Photographs here are stock images for illustration and are not pictures of the events described.

Yellow is the one people ignore

Yellow means rainfall of 7.5 to 15 millimetres per hour is observed or expected to continue.

The official wording is that flooding is possible in low-lying areas. In practice a yellow warning means the rain has already started and is heavy enough that somebody at a desk decided the public needed telling. It is not a forecast of what might happen later, it is a description of what is falling now.

Fifteen millimetres in an hour does not sound like much written down. It is enough to make a road undriveable if the drains are already full, which after two weeks of monsoon they are.

The reason to care about yellow is not yellow itself. It is that the colours escalate quickly and you would rather make your decision at yellow than at the next one.

Orange is where it turns

Orange means 15 to 30 millimetres per hour, and the official phrasing changes from possible to threatening.

At orange, communities are told to be alert for the possibility of evacuation. That is the tell. Yellow describes weather and orange starts describing what you might have to do about it.

This is the band where the practical decisions live. Whether the road out is still passable, whether the last ferry goes, whether you move the car. An orange warning that holds for several hours is doing more damage than a brief red one, because the total volume is what fills a river, not the peak rate.

And orange is common. This is not a rare alert that means something extraordinary is happening. In monsoon season on the west side of Luzon it can appear on an ordinary afternoon, which is exactly why people stop reacting to it.

Red means you are already late

Red is more than 30 millimetres per hour. There is a second trigger too: rain that has kept falling for three hours and passed 65 millimetres total.

The wording at red is serious flooding expected and evacuation is necessary. Not advisable. Necessary.

That second trigger is the one worth remembering, because it means a red warning does not require a dramatic downpour. Steady rain that simply refuses to stop for three hours gets you there. The sky at red does not necessarily look worse than the sky at orange.

By the time red is issued, the water that will flood your street has largely already fallen. Warnings describe rainfall, but flooding is what the ground does with rainfall an hour or two later. Treating red as the moment to start deciding is treating it as a forecast, and it is not one.

Class Suspension is a different decision

Here is the part that catches people, and it is genuinely counterintuitive.

The rainfall colours do not automatically close anything. Under the Department of Education's current rules, the automatic suspension of classes is tied to tropical cyclone wind signals, and it kicks in at Signal No. 3 or higher. Below that, at Signal No. 1 and 2, it is the local mayor's call. School heads and division superintendents handle heat and other local conditions.

Rainfall warnings are not in that automatic tier at all.

So you can have a red rainfall warning over a city, with streets flooding, and no automatic suspension anywhere, because there is no tropical cyclone and therefore no wind signal for the rule to attach to. It comes down to whether the mayor of that particular city declares one, and mayors declare at different thresholds on different days.

This is why announcements arrive at odd hours and why neighbouring cities do different things on the same morning. It is not disorganisation. It is a rule written around wind being applied to a hazard that is made of water.

For anyone travelling, the practical version is that you cannot infer anything about closures from the rainfall colour. You have to check the specific local government, and the rain warning is a signal to go looking rather than an answer in itself.

Why this beats watching for a typhoon

Most people planning a trip check whether there is a storm. It is the obvious thing to check and it is the wrong single question for this country in this season.

The rainfall warnings are issued per area and updated through the day by the regional forecasting divisions, which means they are far more local and far more current than any national storm bulletin. They also exist when no storm does, which is the situation right now and was the situation through most of the flooding this month.

A reasonable habit looks like this. Check whether there is a tropical cyclone, because that governs wind signals and closures. Then check the rainfall warning for the specific province or city you will be standing in, because that governs whether the roads work. Then, if either is active, check the local government's announcements, because that is where suspensions actually get declared.

Three checks, and only the first one is the one visitors normally do.

The colours have been around long enough that Filipinos read them without thinking about it, in the same way a Korean reads a heat advisory or a Japanese reads a seismic intensity number. Nobody explains them to you when you arrive, because to everyone local they are just the weather.

The catchments, and why the colour is local

Rainfall warnings are issued for small areas — cities and municipalities rather than provinces — and in Metro Manila that granularity matters more than anywhere else in the country, because the flooding is driven by catchments that do not follow administrative boundaries.

The Marikina river system is the one that decides how bad a Metro Manila event becomes. Rain falling on the Sierra Madre to the east arrives in the Marikina valley hours later, which means Marikina, Pasig and parts of Quezon City can flood under a clear sky while the rain that caused it fell somewhere the warning never covered. The river has published alarm levels, and those levels are a better indicator for the eastern half of the capital than the colour over your own barangay.

West of that, the problem is different. Manila, Malabon, Navotas and Valenzuela flood on a combination of rainfall and tide, and a moderate orange event arriving on a high tide does more damage than a red one arriving on a low one. Tide tables are published and rarely mentioned in coverage, which is a gap worth closing yourself if you are staying in that part of the city.

Outside the capital the same logic applies with different names. Pampanga and Bulacan sit on a floodplain fed by catchments well to the north, and the water arrives long after the rain stops. Cagayan de Oro and the northern Mindanao coast have short, steep rivers that rise and fall within hours rather than days — a completely different failure mode, where the danger window is narrow and immediate. The mountain provinces of northern Luzon fail by landslide rather than flood, and the trigger there is cumulative rainfall over several days rather than intensity in any single hour.

This is why a national-level summary of a rainfall event is close to useless for deciding what to do. The colour tells you about the sky above one municipality. What happens to you depends on which catchment you are standing in, what that catchment has already absorbed in the preceding days, and, near the coast, what the tide is doing when the water arrives.

There is a timing point buried in this too. Rainfall warnings are reviewed and reissued frequently through an event, and they are downgraded as soon as the rate eases — not when the water goes down. A municipality can drop from red to yellow while the streets beneath it are still impassable and the river is still rising, because the river is responding to rain that fell an hour ago somewhere upstream. Treating a downgrade as an all clear is the most common and most expensive mistake people make with this system, and it is the reason so many vehicles are lost on roads that looked survivable.

The practical version: find out which river system your accommodation sits in before the season starts, not during an event. It takes five minutes and it converts a meaningless colour into an actual decision.

Colour by colour, what to actually do

The official definitions describe rainfall rates. This is the same ladder rewritten as decisions, which is the form it is actually needed in.

Colour	What it means	Decision
Yellow	Heavy rain now; flooding possible in low-lying spots	Keep the plan. Check again in two hours. Do not start a mountain road.
Orange	Flooding is threatening; heavier rates sustained	Stop moving around the city. Cancel the airport run unless it is hours away. Charge everything.
Red	Serious flooding expected; evacuation may be required	Do not travel at all. Move up a floor if you are at ground level near a river.

Three habits are worth more than knowing the definitions. Check the colour for the municipality you are in, not the one in the headline. Check the river level, not just the sky — in Metro Manila that means the Marikina alarm level. And treat a downgrade as unfinished: yellow after orange does not mean the water has gone, only that the rain has eased. The water leaves hours later, and on a floodplain, days later.

Warning systems by region

This page is part of a series that takes each warning system in the western Pacific on its own terms rather than translating them into one another.

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