Tropical Storm Siony, Rolly update

Tropical Storm (TS) Siony maintains its strength as it accelerates West-Norwestaward over the Philippine Sea. TS Rolly also maintains strength while moving Westward over the West Philippine Sea.

On the forecast track, “ROLLY” is expected to exit the Philippine Area of Responsibility (PAR) tomorrow morning. It is forecast to remain as a tropical storm throughout the forecast period. However, there is an increasing likelihood that “ROLLY” will weaken into a tropical depression due to increasingly unfavorable conditions.

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Areas under Tropical Cyclone Wind Signal (TCWS) #1 are now lifted. However, occasional gusts will be experienced over Batanes, Babuyan Islands, Ilocos Region, Cordillera Administrative Region, and the northern portions of mainland Cagayan and Zambales.

Rough to very rough seas (2.8 to 4.5 m) will prevail over the 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 (1.2 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.

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Tropical Storm Siony Update

The center of Tropical Storm “SIONY” is forecast to continue moving west-northwestward or northwestward today through tonight before it slows down significantly and becomes almost stationary tomorrow morning through Wednesday morning.

Afterward, “SIONY” will begin tracking west-southwestward or westward towards Extreme Northern Luzon. Due to the projected erratic movement of this system in the next 48 hours, there is high degree of uncertainty in the forecast track.

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“SIONY” is likely remain within tropical storm category within the next 36 to 48 hours.

Today, the trough of tropical storm “SIONY” will bring light to moderate with at times heavy rains over Batanes, 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.