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Tropical Cyclone Advisory Number 11 for Tonga on Severe Tropical Cyclone Yasa (Category 3)

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TONGAN
ISSUED FROM THE FUA’AMOTU TROPICAL CYCLONE WARNING CENTRE AT 01:00AM SATURDAY 19 DECEMBER 2020
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A TROPICAL CYCLONE WARNING REMAINS INFORCE FOR TONGA
WARNINGS:
A HURRICANE WARNING REMAINS INFORCE TONGATAPU AND ‘EUA LAND AREAS 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 REMAINS 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” Category 3 was located at about Latitude 19.7° South, Longitude 177.6° West or about 305KM Northwest of Nuku’alofa, 340KM Northwest of ‘Eua, 345KM West of Pangai Ha’apai  and 405 Southwest of Neiafu Vava’u, 505KM South of Niuafo’ou, 585KM Southwest of Niuatoputapu at 11:00pm tonight. This system is moving Southeast at about 12 knots (24km/hr). The sustained maximum winds near the center is about 70 knots (140km/hr) with momentary gust up to 100 knots (200km/hr). On its current track, Tropical Cyclone “YASA” is expected to lie at about 250KM Northwest of Nuku’alofa, 290KM Northwest of ‘Eua and 315KM West of Pangai Ha’apai at 7:00am this morning. Associated strong, gale and destructive storm to hurricane force winds, cloudy conditions and periods of heavy rain and thunderstorms with very rough to high seas will affect whole of the group today.
 

FOR TONGATAPU AND ‘EUA:
East to Northeast winds 20-30 knots (40-60km/hrs) and it is expected to rise up to damaging gale force winds of 35-45 knots(70-90km/hrs) by today with momentary gusts of storm to hurricane 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) today. A heavy damaging Northwesterly swell (up to 4-9 metres).

FOR HA’APAI:
East to Northeast winds 20-30 knots (40-60km/hrs) and it is expected to rise up to damaging gale force winds of 35-45 knots(70-90km/hrs) by today  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) today. A heavy damaging Northwesterly swell (up to 4-9 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/hrs) today. 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) today. A heavy damaging Northwesterly swell (up to 4-9 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/hrs). 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 4-9 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 4-6 metres). A heavy damaging Northwesterly swell (up to 4-9 metres).

TIDE PREDICTION FOR NUKU’ALOFA
LOW TIDE                  :    05:00AM
HIGH TIDE                 :    11:25AM
THE MEAN SEA LEVEL PRESSURE RECORDED AT FUA’AMOTU AIRPORT AT 01:00AM WAS 1004.8 MILLIBARS AND THE RELATIVE HUMIDITY WAS 97%. THE NEXT TROPICAL CYCLONE ADVISORY ON SEVERE TROPICAL CYCLONE “YASA” FOR TONGA WILL BE ISSUED ABOUT 4:00AM THIS MORNING.
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 FCD: LF/STP/TTK/FV/NH/PT=                                                                                       CRS: UV/=

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