May 21 ------ Many parts of the country will continue to experience warm and humid weather in the next four days, with heat index reaching as high as 44 degrees Celsius in Sangley Pt., Cavite on Thursday. According to the Philippine Atmospheric, Geophysical, and Astronomical Services Administration (PAGASA), the 44 degrees Celsius heat index in Sangley Pt. could be the highest in the next few days.
Metro Manila may also experience a high heat index reaching 41.2 degrees Celsius on Thursday and Friday. Weather specialist Meno Mendoza said the warm easterly winds will be the dominant weather system in most parts of the country until the weekend. By Sunday Baler, Aurora may reach a maximum heat index of 42.9 degrees Celsius; Cabanatuan City, Nueva Ecija at 42.6 degrees Celsius; Daet, Camarines Norte at 42.3 degrees Celsius; and San Jose, Occidental Mindoro at 42 degrees Celsius.
Heat index is the measurement of how hot it really feels when relative humidity is factored in with the actual air temperature. The highest heat index so far this year was recorded in San Jose last April 20 at 58 degrees Celsius. There is “extreme danger” if the forecast heat index is over 54 degrees Celsius (over 130 degrees Fahrenheit) because heat stroke is imminent, PAGASA said. PAGASA advised the public to observe “extreme caution” if the forecast heat factor is between 32 and 41 degrees Celsius (90-105 degrees Fahrenheit) because heat cramps and heat exhaustion are possible, while continuing activity could result in heat stroke.
Expect “danger” if the forecast heat factor is between 41 and 54 degrees Celsius (105-130 degrees Fahrenheit) as heat cramps and heat exhaustion are likely, while heat stroke is probable with continued activity. It added that full exposure to sunshine can increase the heat index by 8 degrees Celsius. Meanwhile, Mendoza said the frontal system may bring cloudy skies with scattered rains and isolated thunderstorms over Batanes and Babuyan Islands. He advised the public to remain vigilant for possible flooding or landslide in the event of severe thunderstorms in the afternoon or evening.