(1) Typhoon sea warning:

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A sea warning will be issued when the typhoon's radius of sustained winds of 34 knots or greater is anticipated to touch the 100 km sea area of Taiwan, Penghu, Kinmen, and Matsu (TPKM) in 24 hours; and then be updated 3 hourly. Additional warnings will be announced whenever essential (Fig. 2a).

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(2) Typhoon land warning:

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A land warning will be issued if the typhoon's radius of sustained winds of 34 knots or greater is going to hit the land of TPKM in 18 hours;
and then be renewed every 3 hours. Additional warnings will be announced whenever necessary (Fig.2b).

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(3) Termination of a typhoon warning:

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A typhoon land warning will be terminated when the typhoon's radius of sustained winds of 34 knots or greater leaves the land area of TPKM. A typhoon sea warning will be terminated when the typhoon's radius of sustained winds of 34 knots or greater leaves the coastal area in TPKM. The warnings can also be terminated when the typhoon dissipates or changes its direction.