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Tropical Cyclone Advisory Number 21 for Tonga on Tropical Cyclone Yasa

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TONGAN

ISSUED FROM THE FUA’AMOTU TROPICAL CYCLONE WARNING CENTRE AT 07:00AM SUNDAY 20 DECEMBER 2020

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A TROPICAL CYCLONE WARNING REMAINS INFORCE FOR TONGA
WARNINGS:
A GALE WARNING REMAINS INFORCE FOR TELE-KI-TONGA, TELE-KI-TOKELAU, TONGATAPU AND ‘EUA LAND AND COASTAL WATERS.

A STRONG WIND WARNING REMAINS INFORCE FOR THE NIUAS, VAVA’U AND HA’APAI LAND AREAS AND COASTAL WATERS.

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

A HEAVY RAIN WARNING AND FLASH FLOOD ADVISORY REMAINS INFORCE FOR THE NIUAS LAND AREAS

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

SITUATION:
Tropical Cyclone “YASA” Category 1 was located at about Latitude 22.9° South, Longitude 177.7 West or about 335KM Southwest of Nuku’alofa, 340KM Southwest of ‘Eua at 6:00am this morning. This system is moving South at about 8 knots (16km/hr). The sustained maximum winds near the center is about 45 knots (90km/hr) with momentary gust up to 65 knots (130km/hr). On its current track, Tropical Cyclone “YASA” (CAT 1) is expected to lie at about 350KM Southwest of Nuku’alofa and ‘Eua at 10:00am this morning. Associated strong and gale force winds, cloudy conditions and periods of heavy rain and thunderstorms with rough to very rough seas will affect the group today.
   

FOR TONGATAPU AND ‘EUA:
East to Northeast winds 15-20 knots (30-40km/hrs) rising up to strong winds of 25-30 knots (50-60km/hrs) with momentary gusts up to gale force winds 35-45knots (70-90km/hrs). Mostly cloudy with occasional showers. Very rough to high seas (up to 6-8 metres). A heavy damaging Northwesterly swell (up to 4-8 metres).

FOR VAVA’U AND HA’APAI:
East to Northeast winds 15-20knots (30-40km/hrs) with momentary gust up to strong force winds 25-30knots (50-60km/hrs) at times.
Mostly cloudy with occasional showers. Rough to very rough seas (up to 6 metres). A heavy damaging Northwesterly swell (up to 4-7 metres).

FOR THE NIUAS:
North to Northwest winds 10-15knots (20-30km/hrs) with momentary gust up to strong force winds 20-30knots (40-60km/hrs) at times. Mostly cloudy with occasional showers, heavy at times. Rough to very rough seas (up to 6 metres). A heavy damaging Northwesterly swell (up to 4-6 metres)

FOR TELE-KI-TONGA AND TELE-KI-TOKELAU COASTAL WATERS:
Southeasterly winds 20-25knots (40-50km/hrs) then rising up to 30-35knots (60-70km/hrs) with momentary gusts up to gale force winds 40-45knots (80-90km/hrs). Very rough to high seas (up to 6-8 metres). A heavy damaging Northwesterly swell (up to 4-9 metres).

TIDE PREDICTION FOR NUKU’ALOFA
HIGH TIDE                 :   12:15PM
LOW TIDE                   :   06:15PM
THE MEAN SEA LEVEL PRESSURE RECORDED AT FUA’AMOTU AIRPORT AT 7:00AM WAS 1004.0 MILLIBARS AND THE RELATIVE HUMIDITY WAS 91%. THE NEXT TROPICAL CYCLONE ADVISORY ON TROPICAL CYCLONE “YASA” FOR TONGA WILL BE ISSUED ABOUT 10:00AM THIS MORNING.
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