SOUTH CHINA COASTAL WATERS

(NOT TO BE ISSUED AFTER 12:30 P.M.)

WEATHER INFORMATION FOR SOUTH CHINA COASTAL WATERS ISSUED
BY THE HONG KONG OBSERVATORY AT 9:45 A.M. ON 4 OCTOBER 2025

WARNINGS:

HURRICANE FORCE WINDS IN SOUTH OF HONG KONG AND SHANGCHUAN
DAO. GALE FORCE WINDS IN HONG KONG ADJACENT WATERS AND
SHANWEI. STRONG WINDS IN NAN'AO.

WEATHER SITUATION:

AT 10 A.M., SEVERE TROPICAL STORM MATMO WITH MAXIMUM
SUSTAINED WINDS OF ABOUT 110 KILOMETRES PER HOUR NEAR ITS
CENTRE WAS LOCATED AT 18.1 DEGREES NORTH, 116.2 DEGREES
EAST. IT IS FORECAST TO MOVE WEST-NORTHWEST AT ABOUT 25
KILOMETRES PER HOUR ACROSS THE NORTHERN PART OF THE SOUTH
CHINA SEA AND INTENSIFY GRADUALLY.

AREA FORECASTS FOR THE NEXT 24 HOURS

HONG KONG ADJACENT WATERS:

EAST TO NORTHEAST FORCE 4 TO 5, BECOMING SOUTHEAST FORCE 8
LATER.
FREQUENT HEAVY SQUALLY SHOWERS AND THUNDERSTORMS.
MODERATE SEAS, BECOMING VERY ROUGH LATER.

NAN'AO:
NORTHEAST FORCE 6 TO 7, BECOMING SOUTHEAST UP TO FORCE 7.
FREQUENT HEAVY SQUALLY SHOWERS AND THUNDERSTORMS.
ROUGH SEAS.

SHANWEI:
EAST TO NORTHEAST FORCE 7 TO 8, BECOMING SOUTHEAST UP TO
FORCE 9.
FREQUENT HEAVY SQUALLY SHOWERS AND THUNDERSTORMS.
ROUGH TO VERY ROUGH SEAS, BECOMING HIGH.

SOUTH OF HONG KONG:
NORTH TO NORTHEAST FORCE 6 TO 7, BECOMING SOUTHEAST UP TO
FORCE 12 LATER.
FREQUENT HEAVY SQUALLY SHOWERS AND THUNDERSTORMS.
ROUGH SEAS, BECOMING PHENOMENAL LATER.

SHANGCHUAN DAO:
NORTH TO NORTHEAST FORCE 6 TO 7, BECOMING CYCLONIC FORCE 12
LATER.
FREQUENT HEAVY SQUALLY SHOWERS AND THUNDERSTORMS.
ROUGH SEAS, BECOMING PHENOMENAL LATER.

OUTLOOK FOR THE FOLLOWING 48 HOURS

SOUTHEASTERLY WINDS OF FORCE 10 TO 11, CYCLONIC WINDS OF
FORCE 12 AT FIRST. FREQUENT HEAVY SQUALLY SHOWERS AND
THUNDERSTORMS.

LATEST REPORTS FROM SOUTH CHINA COASTAL WEATHER STATIONS

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WAGLAN ISLAND      WIND NORTH-NORTHEAST FORCE 4 
                   VISIBILITY 44 KILOMETRES

SHANTOU            WIND EAST-SOUTHEAST FORCE 2 
                   VISIBILITY 26 KILOMETRES

MACAU              WIND NORTH-NORTHEAST FORCE 3

XISHA              WIND NORTHWEST FORCE 3 
                   VISIBILITY 22 KILOMETRES

DISPATCHED BY HONG KONG OBSERVATORY AT 09:47 HKT ON 04.10.2025