Monday, December 29, 2014

TD 23W (SENIANG) Update #001


for Sunday, 28 December 2014 [2:45 PM PhT]


Issued at: 2:30 PM PhT (06:30 GMT) Sunday 28 December 2014
Next Update: Sunday Evening, 28 December 2014

Tropical Disturbance 99W (LPA) becomes a Tropical Depression 23W (SENIANG) as it gains strength while over the South Philippine Sea, east of Mindanao. 23W (SENIANG) is expected to directly affect most parts of Visayas and Mindanao including Palawan this coming week.

This cyclone will enhance the Northeast Monsoon (Hanging Amihan) - bringing cooler, windy and mostly cloudy conditions with occasional slight to moderate rains along the northern and eastern sections of Luzon.

Residents and visitors along Visayas, Mindanao and Palawan. should closely monitor the development of 23W (Seniang).

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.


Below are the regions or places in the Philippines that could be affected or that are being affected by the hazards generated by the current tropical cyclone.


  • Heavy to Extreme Rains (100 mm or more): Eastern Mindanao especially Dinagat and Siargao Islands, Surigao Provinces, Eastern portions of Agusan Provinces, Northern portions of Compostela Valley and Davao Oriental. - today through Monday morning (Dec 29).
  • Heavy Rains (50 mm to 100 mm): Southern portion of Southern Leyte, Misamis Oriental, Bukidnon and the Northern portion of Davao Region. - today through Monnday morning (Dec 29).
  • Moderate to Heavy Rains (30 mmto 50 mm): Eastern Visayas, Cebu, Siquijor, Bohol, Northern portion of Zamboanga del Norte, Lanao Provinces, Cotabato, Northern part of Maguindanao, and Davao del Sur including Davao City and Samal Island. - today through Monday afternoon (Dec 29).

  • Moderate to Strong Winds (gusts of up to 75 kph): Caraga Region. - tonight through Monday morning (Dec 29).


As of 11:00 AM PhT today...0300 GMT.

Classification/Name: TD 23W (Seniang)
Location: Over the southwestern part of the Philippine Sea (near 8.0N 127.5E)
About: 135 km east-southeast of Bislig City, Surigao del Sur...or 115 km east-northeast of Cateel, Davao Oriental
Maximum Sustained Winds (10-min avg): 55 kph near the center...Gustiness: 75 kph
24 hr. Rain Accumulation (near and west of the center): 50 to 300 mm [Moderate to Extreme]
Minimum Central Pressure: 1000 millibars (hPa)
Size of Circulation [Convective Cloud-Based, in diameter]: 930 km (Medium)
Area of Damaging Winds (95 kph or more): None
Past Movement: West-Northwest @ 16 kph
Forecast Movement: West-Northwest @ 15 kph
Towards: Surigao del Sur


TD 23W (Seniang) is expected to continue moving west-northwestward throughout the forecast period. On the forecast track, TD 23W (Seniang) will be making landfall along Hinatuan-Bislig City area this evening (between 7-10 PM)...and will traverse the Caraga Region through Monday morning. It shall then proceed to move across the Bohol Sea and Southern Negros through Tuesday morning.

TD 23W (Seniang) will intensify into a Tropical Storm before making landfall...and shall lose strength while traversing the mountain ranges of the Caraga Region. Advance Intensity Forecast (AIF) shows its 10-minute maximum sustained winds increasing to 65 kph early this evening.

The following is the 3-day forecast outlook summary for this system:

MONDAY MORNING: Emerges over the Bohol Sea just off the coast of Misamis Oriental...downgraded back into a Tropical Depression after traversing Caraga Region...about 35 km south of Camiguin Island [8AM DEC 29: 8.9N 124.7E @ 55kph].
TUESDAY MORNING: Maintains its strength as it moves across southern Negros...about 55 km southwest of Kabankalan City, Negros Occidental [8AM DEC 30: 9.6N 122.4E @ 55kph].
WEDNESDAY MORNING: Re-intensifies into a Tropical Storm after traversing the Sulu Sea and central Palawan...emerges over the West Philippine Sea...about 25 km northwest of Puerto Princesa City, Palawan [8AM DEC 31: 9.9N 118.5E @ 65kph].

*Please be reminded that the Forecast Outlook changes every 6 hours, and the Day 2 and 3 Forecast Track has an average error of 100 and 250 km respectively...while the wind speed forecast error, averages 35 kph 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.

Important Note: Please keep in mind that the above hazards summary and forecast outlook changes every 6 to 12 hrs!


Time/Date: 11:00 AM PhT Sun Dec 28, 2014
Location of Center: Near 8.0º N Lat 127.5º E Lon
Distance 1: 250 km SSE of Siargao Island
Distance 2: 140 km ESE of Hinatuan, Surigao del Sur
Distance 3: 290 km SE of Surigao City
Distance 4: 330 km ESE of Camiguin Island
Distance 5: 235 km ESE of Butuan City









>> To know the meteorological terminologies and acronyms used on this update visit the ff:

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