Severe Tropical Storm SIONY (ATSANI) Advisory No. 06

24-hr Outlook: STS SIONY (ATSANI) is forecast to begin accelerating westward at an increased forward speed of 19 km/hr later today, and could become a minimal Typhoon (Category 1) by early tomorrow morning (Nov 06), before passing over or very close to Batanes Group. 

• Location of Center/Eye: Over the mid-southern portion of the North Philippine Sea  (near 20.0°N 127.8°E)
• Distance 1: 614 km east of Basco, Batanes
• Distance 2: 612 km east-northeast of Santa Ana, Cagayan
• Distance 3: 673 km east-northeast of Aparri, Cagayan

• None

• BATANES & BABUYAN ISLAND GROUP – beginning Friday Early Morning (Nov 06).

Damaging Winds (gusts of more than 100 km/hr expected):

• BATANES – beginning Friday Early Morning (1 AM) until Early Afternoon (2 PM).

• Coastal Waters of Extreme Northern Luzon – Today through Friday.

+Waves of 3 meters in height is expected in storm surge-prone areas, particularly in coastal areas on where the Tropical Cyclone is headed. Kindly visit the PAGASA Storm Surge Updates  for more details.

• FRIDAY EARLY MORNING: Approaching the coastal waters of Batanes-Babuyan Island Group as a Category 1 Typhoon…about 163 km E of Basc0, Batanes [2AM Nov 06: 20.3°N 123.5°E @ 120 kph].  Confidence Level: HIGH
  
• SATURDAY EARLY MORNING: Strenghens further as it exits the northwestern border of the Philippine Area of Responsibility (PAR), while moving on a WNW track…about 256 km W of Itbayat, Batanes [2AM Nov 07: 21.1°N 119.4°E @ 130 kph].  Confidence Level: MEDIUM
  

**Important Note: Please be reminded that the Forecast Outlook changes every 6 hours, and the Day 2 and 3 Forecast Track have an average error of 100 and 250 km respectively… while the wind speed forecast error, averages 35 km/hr per day. Therefore, a turn to the left or right of its future track and changes in its wind speed must be anticipated from time to time.

• 24-hr. Rain Accum. (across its circulation): 25 to 300 mm [Light to Heavy]
• Minimum Central Pressure: 994 millibars (hPa)
• Size of Rain Circulation (in Diameter): Average (560 km)
• Size of Wind Circulation (55-kph Wind Diameter): Small (495 km)
• Area of Damaging Winds (100 kph or more wind gusts): 110 km from the center