NDRRMC 24/7 Operations Center Officer-in-Charge Aimee Menguilla said in an interview with Rappler, “These alerts, if you already know your area, you know the characteristics of where you live, this EAWM is just a reminder to the people of what you’re supposed to do.”As soon as the Philippine Atmospheric, Geophysical and Astronomical Services Administration issues an advisory, the NDRRMC drafts a message to send to telcos, who in turn sends this to their customers.
On the other hand, a red rainfall warning means torrential rainfall has been observed for an hour and is expected to continue for the next two hours. According to NDRRMC Information and Communications Technology OIC Kelvin Ofrecio, two types of message broadcast systems are used to send alerts: short messaging system and cell broadcast service .
Ofrecio explained in Filipino: “What happens is, if the NDRRMC sends a red rainfall warning alert to Bulacan, and in that area, there are two million subscribers for example, there will be two million seconds of queuing time because it is point-to-point.”
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