Severe Tropical Storm SIONY (ATSANI) Advisory No. 05

, 2020 Season, STS Siony

SEVERE TROPICAL STORM SIONY (ATSANI) ADVISORY NO. 05

Issued at: 7:00 PM PhT (11:00 GMT) Wednesday, 04 November 2020
Next update: 7:00 AM PhT (23:00 GMT) Thursday, 05 November 2020
Current Status & Outlook SIONY (ATSANI) strengthens into a Severe Tropical Storm (STS) as it remains quasi-stationary over the past 6 hours…will start to move slowly westward towards Extreme Northern Luzon.

24-hr Outlook: STS SIONY (ATSANI) is forecast to begin accelerating westward at an increased forward speed of 19 km/hr, and could intensify further by tomorrow morning (Nov 05).
Where is SIONY (ATSANI)? As of 5:00 PM PhT today, November 04…0900 GMT:

  • Location of Center/Eye: Over the mid-southern portion of the North Philippine Sea  (near 20.0°N 129.2°E)
  • Distance 1: 752 km east of Basco, Batanes
  • Distance 2: 758 km east-northeast of Santa Ana, Cagayan
  • Distance 3: 814 km east-northeast of Aparri, Cagayan
How strong is it? Maximum Sustained Winds (1-min avg): 95 kph near the center…Gustiness: 120 kph.
Past Movement (06 hrs) Southwest @ 03 kph (Quasi-Stationary), towards North Philippine Sea
Potential Philippine Landfall Area(s)
  • None
What Philippine areas will be directly affected? Heavy to Extreme Rainfall (50 mm to >100 mm expected for 24 hrs):

  • None

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

  • None
Potential Storm Surge/Coastal Flooding Areas+
  • 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.
3-Day Forecast Outlook Summary**
  • THURSDAY AFTERNOON: Starts to track and accelerate WSW to Westward…about 350 km E of Basc0, Batanes [2PM Nov 05: 19.9°N 125.3°E @ 100 kph].  Confidence Level: HIGH
  • FRIDAY AFTERNOON: Strenghens further as it passes very near Batanes while moving on a WNW track…about 139 km W of Itbayat, Batanes [2PM Nov 06: 20.8°N 120.5°E @ 120 kph].  Confidence Level: MEDIUM
  • SATURDAY AFTERNOON: Intensifies at near-Typhoon strength as it moves across the northern part of the South China Sea (outside of PAR)…about 320 km WSW of Kaohsiung, Taiwan  [2PM Nov 07: 21.6°N 117.4°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.
Other Storm’s Meteorological Information
  • 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): Average (560 km)
  • Area of Damaging Winds (100 kph or more wind gusts): 35 km from the center
Information based on data collected by Typhoon2000 (T2k) shall not be taken as official data. Weather information broadcasted and distributed by PAGASA remains as official data. Typhoon2000 (T2k) shall not be responsible for the private use and reliance of its weather information.

Issued by: David Michael V. Padua for Typhoon2000 (T2K)

 

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PAGASA TROPICAL CYCLONE WIND SIGNAL



Image/Screenshot Source: DOST-PAGASA (http://pubfiles.pagasa.dost.gov.ph/tamss/weather/signals.jpg)

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