It was announced by the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) a few days ago, the Amihan season is well among us already. And as observed by the WeatherPhilippines meteorology team, there is significant weakening in the the southwest monsoon – locally known Habagat.
As many Filipinos feel the start of the Yuletide merry-making, the transition period from Habagat to cooler weather brought by the Amhan begins to take place. This happens usually when we approach the month of October through early November.
With this, Habagat diminishes in strength while the dominant wind feature now comes from the mainland region of Siberia, where strong anticyclones (high-pressure areas or HPAs) usually develop. An HPA exhibits heavier cold air from above which tends to sink into the surface. As it does, wind blows away from the center swirling in a clockwise direction.
The cool, dry season, which runs from November to March, prevails across the country dominated by Amihan. It entails cool, dry winds blowing from the North, normally bringing occasional heavy rains along the Eastern sections of the Philippines. This monsoon wind is relatively cold and dry, but when it interacts with the wind that interacts with Low Pressure Areas emanating from mainland China, its tail-end brings about precipitation.
According to the North Carolina State University in the United States, a monsoon climate is marked by dry winters and wet summers. About a quarter of the globe experiences a monsoon climate. On that note, with the onset of the cool dry months this year, we can expect a few strong Tropical Cyclones that may take a swipe over the whole of the region before the year closes.
Staying ahead of the weather
Despite less rains during the Amihan season compared to Habagat, it is best that we are always prepared for any possible severe weather system that may enter the Philippines. It is best to stay updated with the weather through different weather channels such as websites that share accurate and localized data, or even better, to stay updated in the most convenient way: to have data within your hands reach via a free mobile application (app). You can visit https://weatherph.org or download the WeatherPH app, available for free in Google Play or the Apple Store. Stay ahead of the weather by being #WeatherWiser!
Interested in being #WeatherWiser? Contact us at firstname.lastname@example.org.
Written by: Adonis S. Manzan, Typhoon Specialist, WeatherPhilippines Foundation, Inc.
Weather/Tropical Cyclone 101 Revised 2017 modules
NOAA/The COMET Program