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Tropical Cyclone BasicsRelated Terms
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In Context
PAGASA typically issues bulletins every three to six hours while a cyclone is inside or near the Philippine Area of Responsibility, more frequently as landfall approaches.
Related Terms in Tropical Cyclone Basics
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Extratropical Cyclone
An extratropical cyclone is a storm system that draws its energy from temperature contrasts between air masses rather than warm ocean water, unlike a tropical cyclone.
Low Pressure Area (LPA)
A low pressure area, or LPA, is a region where atmospheric pressure is lower than its surroundings, often the earliest stage PAGASA flags before a system strengthens into a tropical depression.
Post-Tropical Cyclone
A post-tropical cyclone is a former tropical cyclone that has lost its tropical characteristics, such as a warm core, but can still produce heavy rain and strong wind.
Remnant Low
A remnant low is what remains of a tropical cyclone after its organized circulation and rain bands have broken down, though the low pressure center may persist.
Severe Tropical Storm
A severe tropical storm has maximum sustained winds between 89 and 117 km/h, one step below typhoon strength.
Super Typhoon
A super typhoon is PAGASA's classification for a typhoon with maximum sustained winds exceeding 220 km/h.
Tropical Cyclone
A tropical cyclone is a rotating low pressure weather system that forms over warm ocean water and draws its energy from heat released as moist air rises and condenses.
Tropical Depression
A tropical depression is a tropical cyclone with maximum sustained winds of 55 km/h or less, the first classification stage under PAGASA's wind signal system.
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This definition is part of the azifind.com Typhoon Wiki, informed by PAGASA and the World Bank/GFDRR catastrophe risk data used across our province pages. View all Typhoon Wiki terms →