Dangerous Typhoon Nock-ten Threatens the Philippines

Dangerous Typhoon Nock-ten intensified to super typhoon status on Saturday and it posed a significant threat to the northern Philippines.  At 10:00 a.m. EST on Saturday the center of Typhoon Nock-ten was located at latitude 13.5°N and longitude 127.1°E which put it about 440 miles (715 km) east of Manila, Philippines.  Nock-ten was moving toward the west at 8 m.p.h. (13 km/h).  The maximum sustained wind speed was 150 m.p.h. (240 km/h) and there were wind gusts to 185 m.p.h. (290 km/h).  The minimum surface pressure was 928 mb.

Typhoon Nock-ten is a very strong, well organized typhoon.  Nock-ten has a small eye surrounded by a ring of strong thunderstorms.  A rainband is wrapping around the eye and concentric eyewalls could be forming.  Additional rainbands are rotating around the core of the circulation.  Winds to typhoon force extend out about 40 miles (65 km) from the center.  Thunderstorms in the core of the typhoon are generating strong upper level divergence which is pumping out mass in all directions.

Typhoon Nock-ten is moving through an environment that is favorable for tropical cyclones.  It is moving over water where the Sea Surface Temperature is near 29°C.  The upper level winds are weak and there is little vertical wind shear.  If concentric eyewalls forms, then there could be a period of weakening as the inner eyewall dissipates and the inflow becomes concentrated in the outer eyewall.  Wind speeds could increase again if the outer eyewall starts to contract.  In either case Typhoon Nock-ten will be a dangerous typhoon when it reaches the Philippines

A subtropical ridge to the north of Nock-ten is steering the typhoon toward the west and that general motion is expected to continue.  On its anticipated track Typhoon Nock-ten will reach Catanduanes Island within 24 hours.  Nock-ten is expected to move across southern Luzon.

The Hurricane Intensity Index (HII) is 31.6 and the Hurricane Size Index (HSI) is 15.5.  The Hurricane Wind Intensity Size Index (HWISI) is 47.1.  Those indices indicate that Nock-ten is capable of producing regional significant wind damage.

Typhoon Nock-ten will cause significant wind damage when it moves across the Philippines.  It will also generate a significant storm surge in portions of the coast near the path of the center.  Nock-ten will cause heavy rain and create the potential for floods and mudslides over parts of Catanduanes Island and southern Luzon.