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Effects of Weather Disturbances in the Philippines

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Gabriel Flores

on 23 February 2014

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Transcript of Effects of Weather Disturbances in the Philippines

Origin and Formation of Cyclones
Most tropical cyclones form over large and warm areas in the ocean. Those that reach the Philippines generally form near the Caroline-Marianas Island Group and move towards the Philippines in a west-northwest direction.
Effects of Typhoons
Typhoons are generally associated with dreadful outcomes such as loss of human lives and widespread damage to property and agricultural lands. But did you know that typhoons also have beneficial effects?
The Philippines is located in the North Pacific Ocean where the greatest number of cyclones form. An average of 22 cyclones form in this area every year, about 19 of which enter the Philippine Area of Forecast Responsibility (or Philippine Area of Responsibility, PAR). The Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) issues warning bulletins about a typhoon only when it is within the PAR.
Kinds of Cyclopes
Tropical cyclopes are classified, according to maximum winds blowing near the center, as follows:
a. Tropical depression - with wind speed less than 63 kilometers per hour (kph)
b. Tropical storm - with wind speed of 63 to 118 kph
c. Typhoon - with wind speed of more than 118 kph
Torrential rains, flash floods, thunderstorms and thypoons─these are not "news" to Filipinos of any age. They are common occurences in this tropical country. Every now and then, you also hear a tornado that forms quickly and causes much distraction in certain places on land. When a tornado forms over the sea or lake, it its called a waterspout.

Effects of Weather Disturbances in the Philippines
Tropical Cyclones
Tropical cyclones are low pressure areas in the tropics. The wind blows toward the center or "eye" of a cyclone, turning a counterclockwise direction in the North Hemisphere and clockwise direction in the Southern Hemisphere. *Wind direction in a cyclone (A) in the Northern Hemisphere and (B) in the Southern Hemisphere
First of all typhoons bring abundant supply of fresh water, although this may be accompanied by temporary flooding. Secondly, typhoons clean the environment effectively removing pollutants from the air, rivers, and coastal waters of the country
In the area where a cyclone forms, the water is warmer than the surrounding waters, its temperature being higher than 26°C. The warm air above the water rises, causing low pressure.
The rising air expands. The expansion of air against pressure ─ that is, pressure of the overlying atmosphere ─ results in cooling. This kind of cooling, where no heat transfer is involved, is said to be adiabatic. Rising moist air cools adiabatically at the rate of 1/2 degree Celsius for every 100 meters ascent. Cooling causes condensation of water vapor in the air, releasing large amounts of heat.
A low pressure area will fully develop into a cyclone only if the following conditions exist:
a. continuous supply of rising warm moist air;
b. sufficient lifting of the air (meaning, high enough) and;
c. continuous exit of air above to permit a continuous flow of rising air from below.
If these conditions are not maintained, the low pressure are may dissipate.
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