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The first tropical cyclone warning in the country was issued in July 1879. In 1931, the earliest formalized warning system for tropical cyclones was implemented by PAGASA's predecessor, the Philippine Weather Bureau. [5] In the late 20th century, this system gradually became the more familiar four-tiered public storm warning signal system. [6]
The PAGASA began releasing bulletins on the storm on September 22. Initially expected to remain a tropical depression, the agency raised the possibility of raising tropical cyclone wind signals up to Signal No. 1. [44] The PAGASA began raising Signal No. 1 as early as September 23; signals were first raised in Isabela and Aurora. [45]
On September 28, JMA upgraded 14W into a tropical storm and attained the name Koinu, which replaced the name Tembin. PAGASA later followed suit at their 5 AM PHT bulletin, also upgrading Jenny into a tropical storm; JTWC followed thereafter.
TCWS #1 winds of 39–61 km/h (21–33 kn; 24–38 mph) are prevailing or expected to occur within 36 hours: TCWS #2 winds of 62–88 km/h (33–48 kn; 39–55 mph) are prevailing or expected to occur within 24 hours
The Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) releases tropical cyclone warnings in the form of Tropical Cyclone Wind Signals (TCWS, or "wind signals"). [29] Within this warning system, an area having a wind signal may be under:
Upon the system's designation as a tropical depression, the PAGASA raised Tropical Cyclone Wind Signals for Eastern Visayas and the extreme tip of Mindanao as well as the Bicol Region and some areas of Calabarzon and Mimaropa. [42] [43] [44] As the system developed into a typhoon, portions of Samar and Eastern Samar were placed under Signal #3 ...
The Philippine Atmospheric, Geophysical and Astronomical Services Administration (Filipino: Pangasiwaan ng Pilipinas sa Serbisyong Atmosperiko, Heopisiko at Astronomiko, [4] abbreviated as PAGASA, which means "hope" as in the Tagalog word pag-asa) is the National Meteorological and Hydrological Services (NMHS) agency of the Philippines mandated to provide protection against natural calamities ...
Signal #1 – Tropical cyclone winds of 39 km/h (24 mph) to 61 km/h (38 mph) are expected within the next 36 hours. If a tropical cyclone forms very close to the area, then a shorter lead time is seen on the warning bulletin. Signal #2 – Tropical cyclone winds of 62 km/h (39 mph) to 88 km/h (55 mph) are expected within the next 24 hours.