A tropical disturbance formed about 130 km (80 mi) north of the equator and about 530 km (330 mi) south-southwest of Kosrae in the afternoon of 29 November, resulting in the Joint Typhoon Warning Center (JTWC) issuing a Tropical Cyclone Formation Alert on the next day for consolidating under favorable upper-level conditions.
Early on 1 December, the Japan Meteorological Agency (JMA) upgraded it to a tropical depression, and so did the JTWC designating it as 22W. Only six hours later, the JMA upgraded the system to a tropical storm and named it Hagupit, as well as the JTWC, owing to a consolidating low-level circulation center (LLCC) with tightly curved banding wrapping into the system.
However, the RSMC best track data indicated that the system had been already a tropical depression since 30 November and a tropical storm early on 1 December.
With low vertical wind shear and excellent radial outflow, Hagupit consolidated further on 2 December and was upgraded to a severe tropical storm by the JMA and a typhoon by the JTWC at noon.
Late on the same day, the JMA upgraded it to a typhoon when it began to track west-northwestward along the southern periphery of the subtropical ridge.

Remaining in a favorable environment, Hagupit underwent rapid deepening in the afternoon on 3 December and as a result, the JTWC upgraded it to a super typhoon due to the system depicting a significant eye.

The PAGASA named the typhoon Ruby as it entered the Philippine Area of Responsibility early on 4 December.
Simultaneously, Hagupit presented the very tightly curved and deep convective banding with a clear 35 km (25 mi) eye, which 1-minute maximum sustained winds reached 285 km/h (180 mph), equivalent to Category 5 of the Saffir–Simpson hurricane wind scale (SSHWS).
The JTWC also forecast that Hagupit would become as strong as Typhoon Haiyan, but it failed to intensify further.
The JMA analyzed that Hagupit had reached peak intensity at 06:00 UTC, with the 10-minute maximum sustained winds at 215 km/h (130 mph) and the central pressure at 905 hPa (26.72 inHg).
However, the system then started an eyewall replacement cycle and due to moderate easterly vertical wind shear, became less symmetric, with the bulk of the deep convection displaced over the western semi-circle.

As Hagupit slowed down and continued a weakening trend, the eye became cloud-filled early on 5 December, and as a result, was no longer equivalent to Category 5 of the SSHWS.
Because of a robust poleward outflow channel into the mid-latitude westerlies to the north, the eye became clearer and was surrounded by a symmetric annulus of intense convection; the JMA also indicated the brief intensification at noon.
Moreover, a slight break in the steering and the zonal flow along the southern periphery of the mid-latitude trough lacked the dynamics to influence Hagupit, making the typhoon move westward very slowly.
Outflow in the southeast quadrant got hampered due to subsidence associated with an upper-level trough, resulting in a cloud-filled eye again.
Thus, Hagupit weakened further, causing the JTWC to downgrade it to a typhoon early on 6 December.
At 21:15 PST (13:15 UTC), Typhoon Hagupit made landfall over Dolores, Eastern Samar, with the 10-minute maximum sustained winds of 165 km/h (105 mph).
Half a day later, the system made its second landfall over Cataingan, Masbate and turned west-northwestward.

Owing to land interaction and its slow movement, the JMA downgraded Hagupit to a severe tropical storm on 7 December, at 21:00 UTC.
The JTWC also downgraded Hagupit to a tropical storm early on 8 December, right before the fragmented system made its third landfall over Torrijos, Marinduque.
After its fourth landfall over San Juan, Batangas at 17:45 PST (09:45 UTC), the JMA downgraded Hagupit to a tropical storm at noon.
On 9 December, deep convection over the LLCC weakened significantly when Hagupit arrived at the South China Sea and turned westward, although good poleward outflow channel tapping into the mid-latitude westerlies helped the system sustain its minimal tropical storm i
A tropical disturbance formed about 130 km (80 mi) north of the equator and about 530 km (330 mi) south-southwest of Kosrae in the afternoon of 29 November, resulting in the Joint Typhoon Warning Center (JTWC) issuing a Tropical Cyclone Formation Alert on the next day for consolidating under favorable upper-level conditions. Early on 1 December, the Japan Meteorological Agency (JMA) upgraded it to a tropical depression, and so did the JTWC designating it as 22W. Only six hours later, the JMA upgraded the system to a tropical storm and named it Hagupit, as well as the JTWC, owing to a consolidating low-level circulation center (LLCC) with tightly curved banding wrapping into the system. However, the RSMC best track data indicated that the system had been already a tropical depression since 30 November and a tropical storm early on 1 December. With low vertical wind shear and excellent radial outflow, Hagupit consolidated further on 2 December and was upgraded to a severe tropical storm by the JMA and a typhoon by the JTWC at noon. Late on the same day, the JMA upgraded it to a typhoon when it began to track west-northwestward along the southern periphery of the subtropical ridge.
Remaining in a favorable environment, Hagupit underwent rapid deepening in the afternoon on 3 December and as a result, the JTWC upgraded it to a super typhoon due to the system depicting a significant eye.
The PAGASA named the typhoon Ruby as it entered the Philippine Area of Responsibility early on 4 December. Simultaneously, Hagupit presented the very tightly curved and deep convective banding with a clear 35 km (25 mi) eye, which 1-minute maximum sustained winds reached 285 km/h (180 mph), equivalent to Category 5 of the Saffir–Simpson hurricane wind scale (SSHWS). The JTWC also forecast that Hagupit would become as strong as Typhoon Haiyan, but it failed to intensify further. The JMA analyzed that Hagupit had reached peak intensity at 06:00 UTC, with the 10-minute maximum sustained winds at 215 km/h (130 mph) and the central pressure at 905 hPa (26.72 inHg). However, the system then started an eyewall replacement cycle and due to moderate easterly vertical wind shear, became less symmetric, with the bulk of the deep convection displaced over the western semi-circle.
As Hagupit slowed down and continued a weakening trend, the eye became cloud-filled early on 5 December, and as a result, was no longer equivalent to Category 5 of the SSHWS. Because of a robust poleward outflow channel into the mid-latitude westerlies to the north, the eye became clearer and was surrounded by a symmetric annulus of intense convection; the JMA also indicated the brief intensification at noon. Moreover, a slight break in the steering and the zonal flow along the southern periphery of the mid-latitude trough lacked the dynamics to influence Hagupit, making the typhoon move westward very slowly. Outflow in the southeast quadrant got hampered due to subsidence associated with an upper-level trough, resulting in a cloud-filled eye again. Thus, Hagupit weakened further, causing the JTWC to downgrade it to a typhoon early on 6 December. At 21:15 PST (13:15 UTC), Typhoon Hagupit made landfall over Dolores, Eastern Samar, with the 10-minute maximum sustained winds of 165 km/h (105 mph). Half a day later, the system made its second landfall over Cataingan, Masbate and turned west-northwestward.
Owing to land interaction and its slow movement, the JMA downgraded Hagupit to a severe tropical storm on 7 December, at 21:00 UTC. The JTWC also downgraded Hagupit to a tropical storm early on 8 December, right before the fragmented system made its third landfall over Torrijos, Marinduque. After its fourth landfall over San Juan, Batangas at 17:45 PST (09:45 UTC), the JMA downgraded Hagupit to a tropical storm at noon. On 9 December, deep convection over the LLCC weakened significantly when Hagupit arrived at the South China Sea and turned westward, although good poleward outflow channel tapping into the mid-latitude westerlies helped the system sustain its minimal tropical storm i
Typhoon Hagupit (2014)