Issued at: 7:00 PM PhT (11:00 GMT) Sunday, 18 April 2021
Next update: 7:00 AM PhT (23:00 GMT) Monday, 19 April 2021
Current Status & Outlook BISING (SURIGAE) has weakened rapidly into a Category 4  Super Typhoon (STY) while slowing down over the Philippine Sea, east of Bicol Region.

This typhoon will bring occasional rains with severe thunderstorms and gusty winds across Samar and Bicol Provinces today and tomorrow.  Meanwhile, its Trough will also bring rainy conditions across the Visayas and Mindanao.

24-hr Outlook: STY BISING (SURIGAE) is forecast to turn north-northwestward slowly at a speed of 08 km/hr and will pass well to the east-northeast of Catanduanes, more or less 245 km away from the island province by 2:00 PM tomorrow afternoon. This howler will therefore weaken further to below Super Typhoon strength within the next 12 to 24 hours.

Where is BISING (SURIGAE)? As of 5:00 PM PhT today, April 18…0900 GMT:

  • Location of Center/Eye: Along the western portion of the Central Philippine Sea (near 13.5°N 126.9°E)
  • Distance 1: 279 km east of Bato, Catanduanes
  • Distance 2: 344 km east of Legazpi City, Albay
  • Distance 3: 401 km east of Naga City, Camarines Sur
How strong is it? Maximum Sustained Winds (1-min avg): 250 kph near the center…Gustiness: 305 kph.
Past Movement (06 hrs) West-Northwest @ 08 kph, across the 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):

  • Bicol Region & Samar Provinces – Today & Tomorrow.

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

  • None. 
Potential Storm Surge/Coastal Flooding Areas+
  • Coastal Areas of Eastern Visayas & Bicol Region.

+Waves of 3 to 5 meters in height is expected in storm surge-prone areas, particularly in coastal areas on where the Tropical Cyclone is headedKindly visit the PAGASA Storm Surge Updates  for more details.

3-Day Forecast Outlook Summary**
  • MONDAY AFTERNOON: Weakens to a Category 4 Typhoon (TY) as it moves slowly NNW-ward across the western portion of the Central Philippine Sea, ENE of Catanduanes…about 245 km ENE of Bato, Catanduaens [2PM Apr 19: 14.8°N 126.3°E @ 220 kph].  Confidence Level: HIGH
  • TUESDAY AFTERNOON: Weakens to a Category 3 TY while continuing moving slowly NNW-ward across the Central Philippine Sea farther away from Catanduanes…about 298 km NE of Pandan, Catanduanes [2PM Apr 20: 16.2°N 125.8°E @ 195 kph].  Confidence Level: LOW
  • WEDNESDAY AFTERNOON: Maintains its decaying trend, just a Category 2 TY while accelerating slightly NNW-ward entering the North Philippine Sea…about 270 km ENE of Palanan, Isabela  [2PM Apr 21: 17.8°N 124.8°E @ 175 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 Accumulation (across its circulation): 25 to 825 mm [Light to Extreme]
  • Minimum Central Pressure: 900 millibars (hPa)
  • Size of Rain Circulation (in Diameter): Medium (905 km)
  • Size of Wind Circulation (55-kph Wind Diameter): Medium (880 km)
  • Area of Damaging Winds (100 kph or more wind gusts): 170 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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