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PAGASA TermsRelated Terms
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In Context
PAGASA operates under the Department of Science and Technology and maintains its own local naming list for tropical cyclones entering the Philippine Area of Responsibility, separate from the international naming system used by JMA.
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Gale Warning
A gale warning is issued for coastal and marine areas when winds of 39 to 61 knots are expected, advising against sea travel for most vessels.
Heavy Rainfall Warning
A heavy rainfall warning is PAGASA's color-coded alert for expected rain accumulation, issued separately from wind signals since heavy rain can occur without strong winds.
Hydrological Forecast
A hydrological forecast projects river and reservoir water levels, used to anticipate flooding downstream of dams and major waterways during heavy rain events.
Orange Rainfall Warning
An orange rainfall warning signals 15 to 30 mm of rain per hour expected to continue for two or more hours, with flooding likely in many areas.
Red Rainfall Warning
A red rainfall warning signals over 30 mm of rain per hour expected to continue for two or more hours, PAGASA's highest rainfall alert, with severe flooding expected even in areas not normally prone to it.
TCWS No. 1
TCWS No. 1 is raised when winds of 30 to 60 km/h are expected within 36 hours, PAGASA's lowest wind signal level.
TCWS No. 2
TCWS No. 2 is raised when winds of 61 to 120 km/h are expected within 24 hours, prompting the suspension of classes in affected areas.
TCWS No. 3
TCWS No. 3 is raised when winds of 121 to 170 km/h are expected within 18 hours, typically prompting preemptive evacuation in coastal and landslide-prone areas.
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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 →