Siony slightly weakens but remains within the Tropical Storm category over the Philippine Sea, Pagasa said on its severe weather bulletin.
At 10:00 on November 1, the center of Tropical Storm Siony was estimated based on all available data at 990 km East of Northern Luzon.
It is moving West Northwestward at 30 km/h with maximum sustained winds of 65 km/h near the center and gustiness of up to 80 km/h.
The center of Tropical Storm “SIONY” is forecast to continue moving west-northwestward tonight through tomorrow evening before slows down significantly and becomes almost stationary tomorrow evening through Tuesday evening. 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 a high degree of uncertainty in the forecast track.
Siony is likely remain within tropical storm category within the next 36 to 48 hours. It may intensify to severe tropical storm category during the period when it becomes almost stationary on Tuesday.
Hazards affecting land areas and coastal waters: Siony remains less likely to directly affect the weather and coastal water conditions in the country over the next 2 to 3 days. However, the public and disaster managers, especially those situated in Northern Luzon, are advised to continue monitoring for updates on this tropical cyclone.
Tropical Storm Siony Forecast Position
- 24 Hour(Tomorrow evening): 770 km East of Aparri, Cagayan(18.9°N, 128.9°E)
- 48 Hour(Tuesday evening):780 km East of Aparri, Cagayan( 18.6°N, 129.0°E)
- 72 Hour(Wednesday evening): 415 km East of Aparri, Cagayan( 17.7°N, 125.5°E)
- 96 Hour(Thursday evening):85 km West Northwest of Laoag City, Ilocos Norte( 18.4°N, 119.8°E)
- 120 Hour(Friday evening):670 km West of Calayan, Cagayan (OUTSIDE PAR)( 19.7°N, 115.1°E)
Meanwhile, Tropical Storm Rolly weakens over the West Philippine Sea after leaving extreme damage in Bicol, Albay, and Catanduanes area.
According to Pagasa’s severe weather bulletin issued 5 am on November 2, Rolly is moving West Northwestward at 20 km/h with maximum sustained winds of 65 km/h near the center and gustiness of up to 80 km/h.
On the forecast track, Rolly is expected to exit the Philippine Area of Responsibility (PAR) tomorrow morning. It is forecast to remain 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.