Green usually means precipitable water. It doesn't mean they're falling as rain. They could also be suspended in the clouds, waiting to get heavy enough to fall as rain. I don't know the standard operating procedures of PAGASA. But, precipitable values can vary from location to location. For some, it may be green. Others? Yellow.
The Dopplers can also analyze wind flows and vertical cross sections. They can also apply algorithms to filter out useless frequencies or colors. They can even see where the potential for rain amounts are highest. It's a powerful tool. Obviously, a lot of these can only be seen from the control console.
As you could see, there are already showers at the mountainous areas around the metro. They'll only get worse as the daytime temperatures rise.
Just like here where I am, you don't need rain overhead to see flash floods. If heavy rain fall over the mountains, they have to flow somewhere, usually the lower elevations such as the coast and the metro.





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