Tropical storm ‘Siony’ targets extreme Northern Luzon

Published November 1, 2020, 11:45 PM

by Ellalyn De Vera-Ruiz

Tropical storm “Siony” (international name:: “Atsani”) is initially projected to move towards the extreme Northern Luzon but this may still change as there remains a “high degree of uncertainty” in its final track owing to its “erratic” movement, according to the state weather bureau.


The Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) estimated the location of Siony about 990 kilometers (km) east of Northern Luzon as of 10 p.m. Sunday.

It has slightly weakened but remains a tropical storm with maximum sustained winds of 65 kilometers per hour (kph) and gustiness of up to 80 kph. It is currently moving west-northwest at 30 kph. 

PAGASA said the center of ‘Siony’ will likely to continue moving west-northwest on Sunday evening through Monday evening.
It is projected to slow down and barely move from Monday evening through Tuesday evening. 

Afterwards, Siony will begin tracking west-southwest or west towards extreme Northern Luzon. 

Based on its projected track, Siony will be about 770 km east of Aparri, Cagayan by Monday evening; 780 km east of Aparri by Tuesday evening; 415 km east of Aparri by Wednesday evening; 85 km west-northwest of Laoag City, Ilocos Norte by Thursday evening; and 670 km west of Calayan, Cagayan or outside the Philippine area of responsibility by Friday evening.

However, PAGASA said that due to the projected erratic movement of the storm in the next 48 hours, there remains a high degree of uncertainty in its forecast track.

Siony may remain a tropical storm within the next 36 to 48 hours, and intensify to severe tropical storm when it becomes almost stationary on Tuesday.

PAGASA said Siony remains less likely to directly affect the weather and coastal water conditions in the country over the next two to three days but advised those in Northern Luzon to continue monitoring possible developments regarding this weather disturbance.