Cooler days expected as Amihan season begins

Get your holiday playlists, decorations, and implements ready because the cold breeze of the Amihan season is now here for us to enjoy.

As many Filipinos feel the start of Yuletide merrymakings, the transition period from the Southwest Monsoon (Habagat) to cooler weather brought by the Northeast Monsoon (Amihan) takes 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 (HPA) usually develop. A high pressure area (HPA) exhibits heavier cold air from above which tend 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 the Amihan. It entails cool dry wind blowing from the North, normally bringing slight to sometimes heavy rains along the Eastern sections of the Philippines. This monsoon wind is relatively cold and dry, but when it interacts with Mid-Latitude Cyclones, also called a “Frontal System” (See Fig-1), its tail-end bring about precipitation.

 

fig1

Figure 1. A Mid-Latitude Cyclone (Frontal System) which normally persist over Central China heading Eastwards.

Tail-end of a cold front

During the months of November through April, it is not only the cool dry wind associated with Amihan that bring blustery wind condition and relatively good weather overall. When a deep-layered Frontal System exits the Eastern coast of China, chances are its Southernmost edge of a cold front extending along the Eastern coast of Luzon, and in most severe cases, it dips further South to the Visayas and Northern Mindanao.

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 Luzon and Visayas.

Staying ahead of the weather

Despite lesser rains during the Amihan season compared to that of Habagat’s, 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 sharing accurate and localized data, or the most convenient way, to have it within your hands’ reach via a free mobile application. Watch our for the coming weeks as WeatherPhilippines launches its website and mobile app’s new version both with improved design, user interface, and new weather features!


References:

Weather/Tropical Cyclone 101 Revised 2017 modules

NOAA/The COMET Program

http://climate.ncsu.edu

 

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