TROPICAL CYCLONES IN 2009

TABLE 4.6

DURATION OF TROPICAL CYCLONE WARNING SIGNALS ISSUED IN HONG KONG : 1956-2009

Signal	Number of occasions	Duration of each occasion						Total duration per year
		Mean		Maximum		Minimum		Mean		Maximum		Minimum
		h	min	h	min	h	min	h	min	h	min	h	min
1 or higher	336	43	0	161	0	4	30	267	31	570	15	36	35
				(Tilda, 1964)		(T.D.,2000)				(1964)		(1959)
3 or higher	224	29	49	124	15	4	30	123	42	306	35	15	5
				(Mary, 1960)		(T.D.,2000)				(1974)		(2004)
8 or higher	80	15	0	66	50	2	40	22	13	100	55	0	0
				(Mary, 1960)		(Wynne, 1984)				(1964)
8 NW	23	5	47	15	45	1	30	2	28	18	0	0	0
8 SW	31	4	49	10	45	2	0	2	46	16	10	0	0
8 NE	58	7	49	35	35	2	0	8	24	40	20	0	0
8 SE	44	7	21	21	45	0	20	5	59	31	15	0	0
9 or higher	20	7	2	12	25	2	0	2	36	19	25	0	0
				(York, 1999)		(Dujuan, 2003)				(1964)
10	12	6	34	11	0	2	30	1	28	12	10	0	0
				(York, 1999)		(Alice, 1961)				(1964)

Note: ( ) are the years and the names of the tropical cyclones which created the record

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