Tropical Storm SIONY (ATSANI) Advisory No. 03

24-hr Outlook: TS SIONY (ATSANI) is forecast to move very slowly on a clockwise track, and shall intensify slowly while over the North Philippine Sea.

• Location of Center/Eye: Over the southern  part of North Philippine Sea  (near 20.0°N 128.9°E)
• Distance 1: 721 km east of Basco, Batanes
• Distance 2: 728 km east-northeast of Santa Ana, Cagayan
• Distance 3: 784 km east-northeast of Aparri, Cagayan

• None

• None

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

• None

• None

+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.

• WEDNESDAY EVENING: Starts to track SW to Westward…about 632 km E of Santa Ana, Cagayan [8PM Nov 04: 19.3°N 128.1°E @ 75 kph].  Confidence Level: HIGH
• THURSDAY EVENING: Continues to intensify while moving very slowly southward over the North Philippine Sea…about 153 km ENE of Santa Ana, Cagayan [8PM Nov 05: 19.2°N 123.4°E @ 95 kph].  Confidence Level: HIGH
• FRIDAY EVENING: Intensifies at near-Typhoon strength as it passes over the Balintang Channel…about 99 km WSW of Basco, Batanes  [8PM Nov 06: 20.2°N 117.8°E @ 100 kph].  Confidence Level: LOW
  

**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 Accumulation (across its circulation): 25 to 400 mm [Light to Extreme]
• Minimum Central Pressure: 998 millibars (hPa)
• Size of Rain Circulation (in Diameter): Small (420 km)
• Size of Wind Circulation (55-kph Wind Diameter): Small (390 km)
• Area of Damaging Winds (100 kph or more wind gusts): — km from the center