AAH Episode 44: Understanding Typhoons

Typhoon Development and Structure
📌 Typhoons (tropical cyclones) originate over warm tropical oceans where water temperature is 26.5° Celsius or greater, feeding on moisture to form intense circular storms.
🌀 The structure of a typhoon includes the Eye (center with lowest pressure and light winds), the Eyewall (innermost ring with severe weather, heaviest rain, and most intense winds), and Spiral Rain Bands spiraling outward.
↔️ In the Northwestern Pacific, the storm is called a typhoon; in the Northeastern Pacific/Northern Atlantic, the equivalent is a hurricane.

Typhoon Monitoring and Path Tracking
📍 The Philippine Area of Responsibility (PAR) is the monitored region where PAGASA tracks tropical cyclones entering the vicinity of the Philippines.
🗺️ Tropical cyclones generally move in a northwest direction across the country, often making landfall in Eastern Visayas, Bicol Region, and Northern Luzon.
📉 Typhoons weaken and dissipate when they move over land masses because they are cut off from the warm ocean waters that sustain their energy.

Tropical Cyclone Classification and Warning Signals
📊 PAGASA classifies tropical cyclones based on maximum sustained wind speed, ranging from Tropical Depression (up to 61 km/h) to Super Typhoon (exceeding 220 km/h or $>120$ knots).
⚠️ PAGASA issues Tropical Cyclone Wind Signals (TCWS), replacing older storm signals, ranging from TCWS #1 (winds of 30–60 km/h expected within 36 hours) up to TCWS #5 (winds $>220$ km/h expected within 12 hours).
🏫 Cancellation of classes is correlated with the TCWS level: Signal #1 cancels preschool; Signal #2 cancels preschool, elementary, and high school; Signals #3, #4, and #5 cancel all levels.

Key Points & Insights
➡️ An average of 20 tropical cyclones enter the PAR annually, with June to September being the most active period.
➡️ Understanding typhoon nature helps in mitigating negative impacts on life, property, and crops, especially since the Philippines is located in the West Pacific Basin, which has the warmest ocean temperature globally.
➡️ The Eye serves as a crucial reference point for plotting a typhoon's location during weather forecasting.

📸 Video summarized with SummaryTube.com on Feb 28, 2026, 12:14 UTC