MANILA — The Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) raised Public Storm Warning Signal (PSWS) No. 1 over 11 more areas at mid-morning Sunday as severe tropical storm “Nona” continues to gain strength as it heads toward the Samar-Bicol area.

PAGASA said that as of 10 a.m. Sunday, the center of storm “Nona” was estimated based on all available data at 565 kilometers east of Catarman, Northern Samar.

Its maximum sustained winds increased from 95 kilometers per hour (kph) to 110 kph near the center and its gustiness also went up from 120 kph to 140 kph.

The storm continues to move west-northwest at 19 kph and maintaining its speed and movement, it is expected to make landfall in Samar-Bicol area on Monday night, the state-run weather agency said.

Meanwhile, PSWS No. 1 (30-60 kph winds expected in 36 hours) is hoisted over the provinces of Catanduanes, Camarines Sur, Albay, Sorsogon and Masbate, including Burias and Ticao Islands in Luzon; Northern Samar, Eastern Samar, Samar, Biliran, Leyte and Southern Leyte in the Visayas; and Dinagat province in Mindanao.

The estimated rainfall amount is from moderate to heavy within the 300-km diameter of the tropical storm.

PAGASA said it is possible that PSWS #1 would be raised over Camarines Norte, Southern Quezon, Marinduque and Romblon tonight.

Tropical storm “Nona” is forecast to be at 140 km east of Catarman, Northern Samar on Monday morning; and at 65 km north of Romblon, Romblon or 150 km east-southeast of Calapan City, Oriental Mindoro by Tuesday morning. PNA