This weather updates section provides "easy-to-understand" tropical cyclone information over the South China Sea and Northwest Pacific Basin (from Malay Peninsula - 100° E up to the International Date Line - 180°). This website is updated every 6 hours (12pm, 6pm, and 6am Philippine Time ~ GMT+8) during times of tropical cyclone activity except 12am Philippine Time (to be included if Tropical Cyclone will pass over the Philippine Islands or close to Bicol Region).

The tropical cyclone information available on this site are taken from different online meteorological agencies from around the world-wide web namely: WeatherPhilippines Foundation Inc., Philippine Atmospheric Geophysical & Astronomical Services Administration (PAGASA), U.S. Navy's Joint Typhoon Warning Center (JTWC) based in Pearl Harbor, Hawaii, United Nations' Regional Specialized Meteorological Centre (RSMC) Tokyo-Typhoon Centre (Japan Meteorological Agency), & Hong Kong Observatory.

Monday, October 11, 2021

Severe Tropical Storm MARING (KOMPASU) Advisory No. 04

Severe Tropical Storm MARING (KOMPASU) Advisory No. 04



SEVERE TROPICAL STORM MARING (KOMPASU) ADVISORY NO. 04

Issued at: 7:00 PM PhT (11:00 GMT) Monday, 11 October 2021
Next update: 1:00 AM PhT (17:00 GMT) Tuesday, 12 October 2021
Current Status & OutlookSevere Tropical Storm MARING (KOMPASU) has accelerated westward and is now traversing the Babuyan Group of Islands, and is also passing along the coastal waters of Northern Cagayan. Its rainbands continue to affect Northern & Central Luzon.

24-hr Outlook: STS MARING (KOMPASU) is forecast to maintain its westerly course at a speed of 24 km/hr, and could intensify further. The core of STS MARING is expected to be along the coastal waters of Ilocos Norte by early tomorrow morning, and will emerge over the northern portion of the West Philippine Sea, exiting the northwestern border of the Philippine Area of Responsibility (PAR) by tomorrow afternoon (Oct 12)

The presence of this large Tropical Cyclone will continue to enhance the Southwest Monsoon (Habagat) bringing cloudy skies with passing "on-and-off" monsoon rains with possible Severe Thunderstorms and gusty winds of 30-60 kph across Central & Southern Luzon including Metro Manila, MiMaRoPa, Sulu Archipelago, Visayas, & Mindanao today through tomorrow (Oct 12). The effect of this monsoon weather will be more frequent along the western sections with rough seas across the archipelago.

Where is MARING (KOMPASU)?As of 5:00 PM PhT today, October 11…0900 GMT:

  • Location of Center/Eye: Along the southern portion of the Balintang Channel or along the coastal waters of Northern Cagayan (near 18.8°N 122.1°E)
  • Distance 1: 36 km north of Santa Ana, Cagayan
  • Distance 2: 69 km northeast of Aparri, Cagayan
  • Distance 3: 490 km north-northeast of Metro Manila
How strong is it?Maximum Sustained Winds (1-min avg): 95 kph near the center…Gustiness: 120 kph.
Past Movement (06 hrs)West @ 30 kph, towards the Babuyan Islands-Coastal Areas of Ilocos Norte.
Potential Philippine Landfall Area(s)
  • No major landfall expected…just minor landfalls, along the Babuyan Islands between 6-11 PM tonight (Oct 11) – with a high strike probability of >90%.  However, if the forecast track will dip more to the south, a major landfall could occur along the coastal areas of Northern Cagayan & Northern Ilocos Norte.
What Philippine areas will be directly affected?Heavy to Extreme Rainfall (50 mm to >100 mm expected for 24 hrs):

  • Northern Luzon – Today until Tomorrow (Oct 12).

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

  • Southern Batanes, Babuyan Islands, Northern Cagayan – Today until early Tomorrow (Oct 12).
Potential Storm Surge/Coastal Flooding Areas+
  • None

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

3-Day Forecast Outlook Summary**
  • TUESDAY AFTERNOON: Nearing Typhoon classification as it exits the northwestern border of the PAR, while moving westward…about 336 km WNW of Laoag City, Ilocos Norte [2PM Oct 12: 18.9°N 117.5°E @ 110 kph].  Forecast ConfidenceHIGH
  • WEDNESDAY AFTERNOON: Weakens slightly as it approaches Hainan Island, China…about 479 km SW of Hong Kong, China [2PM Oct 13: 18.8°N 111.5°E @ 100 kph].  Forecast ConfidenceHIGH
  • THURSDAY AFTERNOON: Prepares to make landfall over Northern Vietnam…weakens into a Tropical Storm (TS)…about 890 km WSW of Hong Kong, China [2PM Oct 14: 18.6°N 106.6°E @ 75 kph].  Forecast ConfidenceMEDIUM

**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 350 mm [Light to Extreme]
  • Minimum Central Pressure: 980 millibars (hPa)
  • Size of Rain Circulation (in Diameter): Very Large (1,610 km)
  • Size of Wind Circulation (55-kph Wind Diameter): Very Large (1,750 km)
  • Area of Damaging Winds (100 kph or more wind gusts): 20 km outward 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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Image/Screenshot Source: DOST-PAGASA (http://bagong.pagasa.dost.gov.ph/tropical-cyclone-bulletin-iframe)

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