A worker updates the data of the water elevation of the La Mesa Dam, which dropped to 76.49 meters Tuesday morning, March 28, 2023. Normal water level at La Mesa is usually between 78 and 80 meters. Water concessionaires have advised the public to conserve water during the dry season and brace for possible water interruptions due to the threat of El Niño, a weather phenomenon that could lead to a dry spell. State weather bureau PAGASA warned heat indexes between 41°C and 51°C carry impending danger, with the probability of a heat stroke with continued activity and the likelihood of heat cramps and heat exhaustion. Tacloban City logged the highest heat index on Tuesday at 42 degrees Celsius, followed by Dipolog City, Zamboanga del Norte (40℃); NAIA, Pasay City (40℃); Virac, Catanduanes (40℃); and Zamboanga City, Zamboanga del Sur (40℃). The highest heat index recorded this month was 47℃ in San Jose, Occidental Mindoro on March 25.