Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) deputy administrator for operations and services Nathaniel Cruz said the cloudless sky at night allows heat accumulated in the day to escape without restraint, resulting in cold early morning temperatures.
''What's happening is that we have cloudless sky at night. That is why earth's radiation or heat from the sun is not trapped and goes freely,'' Cruz said in an interview.
The minimum temperature recorded at the PAGASA Science Garden in Quezon City at 6 a.m. Sunday was 23 degrees Celsius, up by about 2 degrees Celsius from the minimum temperature recorded on Saturday at 21.6 degrees Celsius.
The cold early mornings in most parts of the metropolis are occurring at a time when the country is experiencing the impact of El Niño - the unusual warming of surface water at the Pacific Ocean that causes drought.
PAGASA said the prevalence of the ridge of the high pressure area over the country will continue to bring ''warm weather'' condition in the coming days. It warned the public to refrain from going out on the sun particularly between 10 a.m. to 3 p.m.
The weather bureau so far recorded the hottest day of the year in Metro Manila last March 6 with a temperature of 35.8 degrees Celsius.
In the PAGASA's 5 a.m. weather bulletin Sunday, the ridge of high pressure area is found to be extending across Luzon and Visayas.
It said that the entire archipelago will experience partly cloudy to cloudy skies except for isolated rainshowers or thunderstorms mostly over the eastern section.
''We have cloudy skies (in Metro Manila) sometimes but chances are still quite small that there will be rains in the coming days,'' Cruz said.
Meanwhile, moderate to strong winds coming from the east to southeast will prevail over the eastern sections of Luzon and Visayas and coming from the northeast over eastern Mindanao and the coastal waters along these areas will be moderate to rough.
Elsewhere, winds will be light to moderate blowing from the east to northeast with slight to moderate seas.
PAGASA said the El Niño-induced dry spell continuously affects the decline of water levels in major dams in the country.
It also significantly affected the water resource for power and irrigation supply over the affected areas in Luzon.
The Angat Dam, which is the main source of Metro Manila's domestic water supply has been threatened to reach the critical level if the ongoing dry condition continue for the next three months, PAGASA said.
Source: news.yahoo.com and mb.com
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