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TROPICAL CYCLONE ADVISORY NUMBER 11 FOR TONGA ON TROPICAL DEPRESSION 11F

ISSUED FROM THE FUA’AMOTU TROPICAL CYCLONE WARNING CENTRE AT 08:00PM TUESDAY 26 FEBRUARY 2019 TONGAN

TROPICAL CYCLONE WARNING REMAINS INFORCE FOR TONGA.

WARNINGS FOR LAND AREAS AND COASTAL WATERS:

A GALE WARNING REMAINS INFORCE FOR ALL OF TONGA LAND AREAS AND COASTAL WATERS.

A HEAVY RAIN WARNING AND FLASH FLOOD ADVISORIES REMAIN INFORCE FOR THE NIUAS, VAVA’U AND HA’APAI.

A HEAVY DAMAGING SWELL REMAINS INFORCE FOR ALL OF TONGA COASTAL WATERS.

SITUATION:

TROPICAL DEPRESSION TD11F WAS LOCATED NEAR LATITUDE 15.8 SOUTH, LONGITUDE 176.0 WEST OR 55KM WEST SOUTHWEST OF NIUAFO’OU, 245KM WEST OF NIUATOPUTAPU OR 385KM NORTHWEST OF VAVA’U AT 7:00PM THIS EVENING. THIS SYSTEM IS GRADUALLY MOVING SOUTH SOUTHWEST AT THE SPEED OF 8 KNOTS (15KM/HR). THE POTENTIAL FOR THE SYSTEM TO DEVELOP INTO A TROPICAL CYCLONE IS HIGH WITHIN THE NEXT 6 HOURS. THE MAXIMUM WINDS NEAR THE CENTER IS ABOUT 30 KNOTS (55 KM/HR) WITH MOMENTARY GUST UP TO 40-45 KNOTS (74-83KM/HR). ON ITS CURRENT TRACK, TD11F IS EXPECTED TO LIE AT ABOUT 180KM SOUTH SOUTHWEST OF NIUAFO’OU, 290KM NORTHWEST OF VAVA’U OR 360KM NORTH NORTHWEST OF HA’APAI AT 1:00AM EARLY TOMORROW MORNING. HEAVY RAIN AND GALE FORCE WINDS MAY START TO AFFECT THE NIUAS AND SPREAD TO VAVA’U AND HA’APAI THIS EVENING.

FOR THE NIUAS: NORTHEAST TO NORTHWEST WINDS 15-20 KNOTS (27-37KM/HR), RISING UP 25-30 KNOTS (46-55KM/HR) WITH MOMENTARY GUST UP TO 40-45 KNOTS (74-83KM/HR). MOSTLY CLOUDY AND OVERCAST WITH OCCASIONAL RAIN, HEAVY AT TIMES WITH ISOLATED THUNDERSTORMS. ROUGH TO VERY ROUGH SEAS. A HEAVY DAMAGING NORTHERLY SWELL. POSSIBLE FLASH FLOOD AND SEA FLOODING IN LOW LYING AREAS DUE TO HEAVY RAIN AND HEAVY DAMAGING SWELL.FOR VAVA’U:

EAST TO NORTHEAST WINDS 15-20 KNOTS (27-37KM/HR). TENDING NORTH TO NORTHEAST WINDS 25-30 KNOTS (46-55KM/HR) WITH MOMENTARY GUST UP TO 40-45 KNOTS (74-83KM/HR) TONIGHT. MOSTLY CLOUDY AND OVERCAST WITH OCCASIONAL RAIN, HEAVY AT TIMES WITH ISOLATED THUNDERSTORMS. ROUGH TO VERY ROUGH SEAS. A HEAVY DAMAGING NORTHERLY SWELL. POSSIBLE FLASH FLOOD AND SEA FLOODING IN LOW LYING AREAS DUE TO HEAVY RAIN AND HEAVY DAMAGING SWELL.FOR HA’APAI:

EAST TO NORTHEAST WINDS 15-20 KNOTS (27-37KM/HR). TENDING NORTH TO NORTHEAST WINDS 25-30 KNOTS (46-55KM/HR) WITH MOMENTARY GUST UP TO 35-45 KNOTS (64-83KM/HR) EARLY TOMORROW MORNING. MOSTLY CLOUDY AND OVERCAST WITH OCCASIONAL RAIN, HEAVY AT TIMES WITH ISOLATED THUNDERSTORMS. ROUGH TO VERY ROUGH SEAS. A HEAVY DAMAGING NORTHERLY SWELL. POSSIBLE FLASH FLOOD AND SEA FLOODING IN LOW LYING AREAS DUE TO HEAVY RAIN AND HEAVY DAMAGING SWELL.FOR TONGATAPU AND ‘EUA:

EAST TO SOUTHEAST WINDS 15-20 KNOTS (27-37KM/HR), TENDING NORTH TO NORTHEAST WINDS, 25-30 KNOTS (46-55KM/HR) WITH MOMENTARY GUST UP TO 35-45 KNOTS (64-83KM/HR) TOMORROW.CLOUDY PERIODS WITH POSSIBLE OCCASSIONAL SHOWERS HEAVY AT TIMES TOMORROW.
ROUGH TO VERY ROUGH SEAS. A HEAVY DAMAGING NORTHERLY SWELL.
POSSIBLE FLASH FLOOD AND SEA FLOODING IN LOW LYING AREAS.

TIDE PREDICTION

LOW TIDE : 07:35PM
HIGH TIDE : 01:50AM EARLY TOMORROW MORNING

THE MEAN SEA LEVEL PRESSURE RECORDED AT FUA’AMOTU AIRPORT AT 08:00PM WAS 1004.2 MILLIBARS AND THE RELATIVE HUMIDITY WAS 93%.
THE NEXT TROPICAL CYCLONE ADVISORY ON TROPICAL DEPRESSION 11F FOR TONGA WILL BE ISSUED AT ABOUT 11:00PM THIS EVENING.

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FCD: VF/PK/SP/STP/NH/AA/SU= CRS: ST/HT/=