Tropical Storm VONGFONG (AMBO) Update No. 17





Issued at: 7:00 AM PhT (23:00 GMT) Saturday, 16 May 2020
Next update: 1:00 PM PhT (05:00 GMT) Saturday, 16 May 2020
Current Status and Outlook

VONGFONG (AMBO) has rapidly weakened into a Tropical Storm (TS)  after traversing Central Luzon last night…now in the vicinity of Naguilian, La Union. Disorganized rainbands of the storm will continue to spread across Central & Northern Luzon bringing scattered to widespread rains and thunderstorms for the next 12 to 24 hours.

24-hr Outlook: TS VONGFONG (AMBO) is forecast to move northward @ 18 km/hr upon emerging over the West Philippine Sea, near the coastal areas of Ilocos Provinces. It expected to weaken further while over the western part of the Balintang Channel around 2 AM tomorrow (May 17).

Where is VONGFONG (AMBO)? As of 5:00 AM PhT today, May 16…2100 GMT. The center was located over Naguilian, La Union (near 16.5°N 120.4°E), about 12 km south-southeast of San Fernando City, La Union or 24 km west-northwest of Baguio City, Benguet.
How strong is it?

Maximum Sustained Winds (10-min avg): 75 kph near the center…Gustiness: 95 kph.

Past Movement (06 hrs) North-Northwest @ 24 kph, towards Coastal Waters of Ilocos Provinces.
Potential Philippine Landfall Area(s) :: None
What Philippine areas will be directly affected? Heavy to Extreme Rains (50 mm to more than 100 mm expected):

>> Scattered sections of Central & Northern Luzon – Today

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

>> None.

Potential Storm Surge/Coastal Flooding Areas+ :: None.

+Waves of 1 to 3 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**

SUNDAY EARLY MORNING: Over the western part of Balintang Channel…weakened furtherabout 172 km NW of Pagudpud, Ilocos Norte [2AM May 17: 19.8°N 119.8°E @ 65kph].  Confidence Level: MEDIUM.

MONDAY EARLY MORNING: Accelerates towards the NE while over the East Taiwan Sea as it weakens into a Tropical Depression (TD)…about 186 km E of Taitung, Taiwan [2AM May 18: 22.5°N 122.9°E @ 55kph].  Confidence Level: LOW.

TUESDAY EARLY MORNING: Exits the northern border of the Philippine Area of Responsibility (PAR), while accelerates rapidly NE-ward across the Southern Islands of Japan…becoming an Extratropical Cyclone…about 467 km E of Taipei, Taiwan [2AM May 19: 24.9°N 126.2°E @ 35kph].  Confidence LevelLOW.

**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 Info > 24 hr. Rain Accumulation (across its circulation): 25 to 220 mm [Light to Heavy]

> Minimum Central Pressure: 998 millibars (hPa)

> Size of Circulation [Convective Cloud-Based, in diameter]: 545 km (Small)

> Area of Damaging Winds (100 kph or more wind gusts): None.

Additional Information Time/Date: 5:00 AM PhT Sat May 16, 2020
Location of Center/Eye: near 16.5°N Lat 120.4°E Lon
Distance 1:  51 km N of Dagupan City, Pangasinan
Distance 2: 100 km NW of San Jose City, Nueva Ecija
Distance 3: 57 km S of  San Jose City, Nueva Ecija
Distance 4: 119 km S of Vigan City, Ilocos Sur
Distance 5: 225 km NNW of Metro Manila
24 hr. Forecast Coordinates (Class): 19.8°N 119.8°E (TS)
48 hr. Forecast Coordinates (Class): 22.5°N 122.9°E (TD)
72 hr. Forecast Coordinates (Class): 24.9°N 126.2°E (LPA)

Information based on data collected by WeatherPhilippines Foundation, Inc. shall not be taken as official data. Weather information broadcasted and distributed by PAGASA remains as official data. WeatherPhilippines shall not be responsible for the private use and reliance of its weather information.

Issued by: David Michael V. Padua for WeatherPhilippines

Image Source: DOST-PAGASA (

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