The highest heat index on Friday, April 2, was recorded in Catbalogan, Western Samar, at 43 degrees Celsius, according to the Philippine Atmospheric, Geophysical and Astronomical Service Administration (PAGASA).Â
Two other stations also recorded high heat indices ---42 degrees Celsius in Dagupan, Pangasinan and 41 degrees Celsius in Davao City in Davao del Sur.
PAGASA defines heat index as a "human discomfort index that gives the apparent temperature or what humans perceive or feel as the temperature affecting their body."
"High air temperatures and high relative humidity will give high apparent temperatures or indices," it added.
Heat index level between 41 degrees Celsius and 54 degrees Celsius is classified under the "danger" level. The state weather bureau said that heat cramps and heat exhaustion are likely, while heat stroke is "probable with continued activity."
PAGASA advised the public to stay indoors as much as possible. "If air conditioning is not available, stay on the lowest floor out of the sunshine."
Wear lightweight and light colored clothing. Also, drink plenty of water regularly.
"Water is the safest liquid to drink during heat emergencies. Avoid drinking liquor because it dehydrates the body," said PAGASA.
"Eat small meals however, eat more often. Avoid eating foods high in protein which can increase metabolic heat," it added.