AN ACT REORGANIZING PAGASA IN ORDER TO FURTHER STRENGTHEN AND ENHANCE ITS CAPABILITY FOR THE MITIGATION OF THE EFFECTS OF NATURAL CALAMITIES CAUSED BY TYPHOONS AND OTHER SEVERE ATMOSPHERIC, GEOPHYSICAL AND SPACE PHENOMENA AND FOR OTHER PURPOSES, BYFURTHER AMENDING PRESIDENTIAL DECREES NO. 78, DATED DECEMBER 9, 1972 AS AMENDED BY P.D. 1149 AND P.D. 1753