Rainy season has set in, Pagasa says
05/14/2009 | 05:40 PM
MANILA, Philippines - Now it's official: the rainy season this year has started, the Philippine Atmospheric Geophysical and Astronomical Services Administration said.
In an advisory on its website, Pagasa noted several causes for above-normal rainfall conditions in the past several weeks.
"For the past several weeks, the country has been experiencing above normal rainfall conditions due to the presence of the rain-producing weather systems such as low-pressure areas (LPAs), intertropical convergence zone (ITCZ), and the tropical cyclones. The series of LPAs that developed into tropical cyclone such as Crising, Dante and Emong were embedded in the ITCZ and caused excessive rainfall in some parts of Luzon and Visayas," it said.
Pagasa said the early migration of the ITCZ is enhancing the southwest windflow over the western and southern parts of the country.
"The characteristically moist southwest windflow is expected to prevail due to the intensification of the high-pressure area over Australia especially in the months of July and August," it said.
Other rainfall causing systems relative to the southwest monsoon such as the ITCZ and tropical cyclones may be modulated by the recession of the North Pacific high-pressure area and breaks in the rain periods could be expected before the normal peak of the rainy season in July and August, it said.
It added the rainy season will start receding toward the end of August until its normal termination by the end of September. - GMANews.TV
In an advisory on its website, Pagasa noted several causes for above-normal rainfall conditions in the past several weeks.
"For the past several weeks, the country has been experiencing above normal rainfall conditions due to the presence of the rain-producing weather systems such as low-pressure areas (LPAs), intertropical convergence zone (ITCZ), and the tropical cyclones. The series of LPAs that developed into tropical cyclone such as Crising, Dante and Emong were embedded in the ITCZ and caused excessive rainfall in some parts of Luzon and Visayas," it said.
Pagasa said the early migration of the ITCZ is enhancing the southwest windflow over the western and southern parts of the country.
"The characteristically moist southwest windflow is expected to prevail due to the intensification of the high-pressure area over Australia especially in the months of July and August," it said.
Other rainfall causing systems relative to the southwest monsoon such as the ITCZ and tropical cyclones may be modulated by the recession of the North Pacific high-pressure area and breaks in the rain periods could be expected before the normal peak of the rainy season in July and August, it said.
It added the rainy season will start receding toward the end of August until its normal termination by the end of September. - GMANews.TV
