When a named weather disturbance within the PAR has made or is expected to make a landfall in the Philippines, PAGASA is mandated to issue Severe Weather Bulletins (SWB) every three to six hours. If the weather disturbance is not affecting land, the weather agency has to issue SWBs every 12 hours.
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Plant cells have a cell wall, chloroplasts and other specialized plastids, and a large central vacuole, whereas animal cells do not.
Answer:
When a named weather disturbance within the PAR has made or is expected to make a landfall in the Philippines, PAGASA is mandated to issue Severe Weather Bulletins (SWB) every three to six hours. If the weather disturbance is not affecting land, the weather agency has to issue SWBs every 12 hours.