Virac, Catanduanes registered the highest heat index on Holy Monday, April 14, at 45 degrees Celsius.
More than 20 other areas, mostly in Central and Southern Luzon, also reached dangerous heat index levels of 42-44 degrees Celsius.
A heat index within the 42°C to 51°C range is classified as 'danger' level by PAGASA, with potential for heat cramps and exhaustion.
Prolonged exposure to such heat conditions increases the risk of heat stroke.
PAGASA forecasts almost 50 areas may experience heat index values of 40 degrees Celsius or higher on Holy Tuesday, April 15.
Fourteen of these areas are expected to be at danger level, including Cavite City, Dumangas (Iloilo), La Carlota City, Puerto Princesa City, and Virac (Catanduanes).
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