Tropical Storm Siony continues to decelerate northward over the Philippine Sea east of Extreme Northern Luzon, the latest Pagasa weather bulletin said.
At 10:00 PM Monday, the center of Tropical Storm “SIONY” was estimated based on all available data at 605 km East of Basco, Batanes.
It is moving Northward slowly with maximum sustained winds of 65 km/h near the center and gustiness of up to 80 km/h.
Siony is forecast to gradually enter into a quasi-stationary state in the next 36 hours. Afterwards, the tropical storm will move generally westward towards Extreme Northern Luzon.
A landfall scenario over Batanes-Babuyan Islands area around Friday remains likely. However, due to the projected quasi-stationary state of this tropical storm in the next 36 hours, there remains a high degree of uncertainty in the forecast track.
Tropical Storm Siony is likely remain within tropical storm category within the next 36 hours. Intensification into a severe tropical storm is likely on Wednesday and into a Typhoon on Thursday prior to close approach or landfall over Extreme Northern Luzon.
Tropical Storm Siony to landfall over Extreme Northern Luzon
The combined effects of the northeasterlies and the trough of Tropical Storm Siony will bring light to moderate with at times heavy rains over Batanes, Apayao, Cagayan, and Isabela.
Flooding (including flashfloods) and rain-induced landslides may occur during heavy or prolonged rainfall especially in areas that are highly or very highly susceptible to these hazards. PAGASA Regional Services Divisions may issue local thunderstorm/rainfall advisories and heavy rainfall warnings as appropriate.
The northeasterlies enhanced by Tropical Storms Rolly and Siony will bring strong to near gale conditions with higher gusts over Batanes, Babuyan Islands, and the northern portions of Cagayan and Ilocos Norte.
The combined effects of “ROLLY”, “SIONY”, and the enhanced northeasterlies will bring rough to very rough seas (2.8 to 4.5 m) over the entire seaboards of Northern Luzon and the western seaboard of Central Luzon. Sea travel is risky over these waters, especially for those using small seacrafts.
Moderate to rough seas (1.5 to 2.5 m) will be experienced over the remaining seaboards of Luzon and the eastern seaboards of Visayas and Mindanao. Mariners of small seacrafts are advised to take precautionary measures when venturing out to sea. Inexperienced mariners should avoid navigating in these conditions.