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Rains due to the ITCZ will likely affect some parts of Visayas over the weekend, he added.
The intertropical convergence zone (ITCZ) has long been assumed to be a major control on tropical rainfall over both oceans and land.
In addition to the passage of ITCZ over the region, the weather balloon launched from Hamad International Airport on Tuesday dawn indicated the presence of relative cold advection in the upper levels of the atmosphere, which helped the formation of thundery clouds with scattered light to moderate rain.
But, the storm clouds in the ITCZ can merge to create towering thunderclouds whose upper reaches are higher than most commercial planes fly.
During the weekend, alow-pressurearea which is embedded in the ITCZ will bring partly cloudy to cloudy skies withrainshowersand thunderstorms across the country that may trigger flash floods and landslides.
Researchers utilized two different state-of-the-art general circulation models for the period 850-1850 to study how large and powerful volcanic explosions known as Plinian eruptions affected the intertropical convergence zone (ITCZ)--the narrow band of convective rain clouds near the equator where the northeast and southeast trade winds converge and which has a significant influence on precipitation across the tropical world.
For some weeks now, the consistent presence of tropical moist air: the airmass linked to the broad range of the Inter-Tropical Convergence Zone (ITCZ), has become more and more evident as the summer advances.
Lamb suspects that the drought/SST pattern, which shifts the region of highest sea surface temperatures 300 km to the south, similarly shifts the so-called intertropical convergence zone (ITCZ), where wind fields from the two hemispheres meet.
Pagasa said the ITCZ will bring cloudy skies with scattered rain showers thunderstorms over Compostela Valley, Davao del Norte, Davao Oriental and Davao del Sur.
The Intertropical Convergence Zone (ITCZ) will affect Mindanao and Palawan areas on Sunday, the Philippine Atmospheric, Geophysical and Astronomical Services Administration (Pagasa) said.
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- ITCT 2k2 Automatic Processing System