Marikina acting mayor Dr. Jose Fabian Cadiz has urged residents near the banks of the Marikina River to evacuate immediately as the water level in the channel rises fast early Thursday morning. "Tataas ang tubig ng Marikina River mas mataas kaysa kahapon at nung isang araw. Lahat ng nasa tabing ilog ng Marikina move now," said director Mahar Lagmay of Project NOAH of the department of Science and Technology (DOST). Project NOAH is the technology-based, integrated disaster prevention and mitigation system of the DOST. "Marikina River water level (Sto Niño station) 20.04 meters now and rising," Lagmay said in a tweet. Rainfall Over the past hours, the color-coded PAGASA rainfall warnings issued for Metro Manila have switched back and forth through the three colors: red, green and yellow. The latest alert at 3:30 a.m. Thursday was a yellow but earlier at 12:30 a.m. it was at green. Wednesday afternoon, the alert was at red.
Yellow means “caution”. Residents are advised to monitor the news for further updates. “Yellow warning” represents 7.5-15 mm rain in an hour which could also cause flooding.
Green means “go”. Go ahead and prepare for possible evacuation. “Green warning” stands for 15-30 mm rain in an hour that is also expected to continue within the next two hours. At this point, low-lying areas are expected to suffer from floods because of relatively heavy downpour. The memorable Typhoon Pedring (Nesat), which hit the country on September 27, 2011, fell within the green warning range as it had a recorded rainfall of about 15-25 mm per hour.
Red means “stop”. Better stop what you are doing now if PAGASA says your area is under a “red warning.” Evacuate. Think about the amount of rain at Typhoon Ondoy’s (Ketsana) peak when it hit the country on September 26, 2009. The recorded rainfall at that time was approximately 56 mm in an hour. According to PAGASA, if more than 30mm rain is observed in an hour, and is expected to continue in the next two hours, then low-lying areas are expected to experience serious flooding. Residents in areas that have low elevation, such as coastal towns and cities, the CAMANAVA (Caloocan, Malabon, Navotas, Valenzuela) area, are advised to evacuate immediately. — ELR, GMA News