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Tropical Cyclone Advisory Number 8 for Tonga on Severe Tropical Cyclone Yasa (Category 3) (18 December 2020)

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TONGAN
ISSUED FROM THE FUA’AMOTU TROPICAL CYCLONE WARNING CENTRE AT 4:00PM FRIDAY 18 DECEMBER 2020

A TROPICAL CYCLONE WARNING REMAINS INFORCE FOR TONGA

WARNINGS:

A HURRICANE WARNING IS NOW INFORCE TONGATAPU AND ‘EUA LAND AND COASTAL WATERS.

A STORM FORCE WIND WARNING REMAINS INFORCE FOR HA’APAI LAND AREAS AND COASTAL WATERS.

A GALE WARNING REMAINS INFORCE FOR VAVA’U AND THE NIUAS LAND AREAS AND COASTAL WATERS.

A STRONG WIND WARNING REMAINS INFORCE FOR TELE-KI-TONGA AND TELE-KI-TOKELAU COASTAL WATERS.

A HEAVY RAIN WARNING AND FLASH FLOOD ADVISORY REAMINS INFORCE FOR ALL OF TONGA LAND AREAS.

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

A SMALL CRAFT ADVISORY REMAINS INFORCE FOR ALL OF TONGA COASTAL WATERS.

SITUATION:
Severe Tropical Cyclone “YASA” has been downgraded to Category 3 system. It was located at about Latitude 18.6° South, Longitude 178.7° West or 465KM Northwest of Nuku’alofa, about 475KM Southwest of Niuafo’ou, 480KM Northwest of Pangai Ha’apai, 500KM West of Neiafu Vava’u, 505KM Northwest of ‘Eua, 605KM Southwest of Niuatoputapu at 3:00pm this afternoon today. This system is moving Southeast at about 10 knots (20km/hr). The sustained maximum winds near the center is about 65 knots (130km/hr) with momentary gust up to 100 knots (200km/hr). On its current track, Tropical Cyclone “YASA” is expected to lie at about 365KM Northwest of Nuku’alofa at 10pm tonight. Associated strong, gale and destructive storm force winds, cloudy conditions and periods of heavy rain and thunderstorms with very rough to high seas will affect whole of the group by today.

FOR TONGATAPU AND ‘EUA:
East to Northeast winds 20-30 knots (40-60km/hr) and it is expected to rise up to damaging gale force winds of 35-45 knots(70-90km/hr) by tonight and tomorrow with momentary gusts up to storm force winds 50-70knots (100-140km/hrs). Mostly cloudy and overcast with periods of occasional rain, heavy at times. Moderate seas (up to 2.5 metres) becoming rough to very rough seas (up to 6-8 metres) by this evening. A heavy damaging Northwesterly swell (up to 4-6 metres).

FOR HA’APAI:
East to Northeast winds 20-30 knots (40-60km/hr) and it is expected to rise up to damaging gale force winds of 35-45 knots(70-90km/hr) by tonight and tomorrow with momentary gusts up to storm force winds 50-60knots (100-120km/hrs). Mostly cloudy and overcast with periods of occasional rain, heavy at times. Moderate seas (up to 2.5 metres) becoming rough to very rough seas (up to 6-8 metres) by this evening. A heavy damaging Northwesterly swell (up to 4-6 metres).

FOR VAVA’U:
East to Northeast winds 25-30knots (50-60km/hrs) with momentary gust up to gale force winds 35-45knots (70-90km/hr). Cloudy and overcast at times with periods of heavy occasional rain and thunderstorms. Moderate seas (up to 2.5 metres) becoming rough to very rough seas (up to 6-8 metres) by this evening. A heavy damaging Northwesterly swell (up to 4-6 metres).

FOR THE NIUAS:
North to Northwest winds 25-30knots (50-60km/hrs) with momentary gust up to gale force winds 35-45knots (70-90km/hr). Mostly cloudy and overcast with occasional rain, heavy at times with isolated thunderstorms. Moderate seas (up to 2.5 metres) becoming rough to very rough seas (up to 6-7 metres). A heavy damaging Northwesterly swell (up to 4-6 metres)

FOR TELE-KI-TONGA AND TELE-KI-TOKELAU COASTAL WATERS:
Southeast winds 20-25knots (40-50km/hrs) then rising up to 30-35knots (60-70km/hrs). Moderate to rough seas (up to 6-8 metres). A heavy damaging Northwesterly swell (up to 4-6 metres).

TIDE PREDICTION FOR NUKU’ALOFA

LOW TIDE : 04:30PM
HIGH TIDE : 10:30PM

THE MEAN SEA LEVEL PRESSURE RECORDED AT FUA’AMOTU AIRPORT AT 4:00PM WAS 1006.0 MILLIBARS AND THE RELATIVE HUMIDITY WAS 93%. THE NEXT TROPICAL CYCLONE ADVISORY ON SEVERE TROPICAL CYCLONE “YASA” FOR TONGA WILL BE ISSUED ABOUT 7:00PM THIS EVENING.