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Posts Tagged ‘Vava’u’

Super Cyclone IAN Targeting Ha’apai islands, Tonga

Posted by feww on January 11, 2014

EXTREME CLIMATIC EVENT

IAN the most powerful cyclone to hit northern islands of Tonga

Tonga has declared a state of emergency for the northern islands, after the authorities reported extensive damage to homes on Hunga.

IAN is forecast to track east of Tonga’s capital, Nuku’alofa, but could still cause large scale destruction to property and infrastructure.

FIRE-EARTH Models showed IAN had intensified to a super cyclone with sustained winds of about 235 km/h gusting to over 280 km/h at 04:20UTC on January 11, 2014.

IAN 11jan14
Super Cyclone IAN.  Water Vapor [FIRE-EARTH Enhancement] Satellite Image. Recorded at 03:52UTC on Saturday, January 11, 2014.  Initial Image Sourced from: CIMSS/SSEC/WISC.

The FIJI Met Office has just issued the following Warning:

Special Weather Bulletin Number TWENTY EIGHT for Tonga
ON SEVERE TROPICAL CYCLONE IAN –
ISSUED FROM RSMC NADI (FIJI) – Jan 11, 2014  at 04:20UTC

TROPICAL CYCLONE WARNING.

A HURRICANE WARNING REMAINS IN FORCE FOR THE HA’APAI GROUP.
A GALE WARNING REMAINS IN FORCE FOR THE TONGATAPU GROUP BUT IS NOW
CANCELED FOR VAVAU GROUP.

A STRONG WIND WARNING REMAINS IN FORCE FOR THE REST OF TONGA.

SEVERE TROPICAL CYCLONE IAN CENTRE [935HPA] CAT 5 WAS LOCATED NEAR 19
DECIMAL 5 SOUTH 174 DECIMAL 2 WEST OR ABOUT 55 NAUTICAL MILES
SOUTH-SOUTHWEST OF VAVA’U AND 10 NAUTICAL MILES SOUTHEAST OF HA’APAI
AT [11 Jan 03:00UTC ]  IAN IS CURRENTLY MOVING TOWARDS THE SOUTH-SOUTHEAST AT
ABOUT 08 KNOTS. CLOSE TO ITS CENTRE, THE CYCLONE IS ESTIMATED TO HAVE
AVERAGE WINDS UP TO ABOUT 110 KNOTS WITH MOMENTARY GUSTS TO 155
KNOTS.

ON THIS FORECAST TRACK, THE CYCLONE IS EXPECTED TO BE LOCATED ABOUT
95 NAUTICAL MILES SOUTH-SOUTHEAST OF HA’APAI OR ABOUT 85 NAUTICAL
MILES EAST OF NUKUALOFA AT [11 Jan at 15:00UTC] AND ABOUT 140 NAUTICAL MILES
SOUTHEAST OF NUKUALOFA OR ABOUT 185 NAUTICAL MILES SOUTH-SOUTHEAST OF
HA’APAI AT [12 Jan 03:00UTC]

DESTRUCTIVE WINDS MAY BEGIN SEVERAL HOURS BEFORE THE CYCLONE CENTRE
PASSES OVERHEAD OR NEARBY.

FOR THE HA’APAI GROUP:
EXPECT VERY DESTRUCTIVE HURRICANE FORCE WINDS WITH AVERAGE SPEED OF
110 KNOTS AND MOMENTARY GUSTS TO 155 KNOTS. WINDS EXPECTED TO EASE TO
AVERAGE SPEED OF 65 KNOTS WITHIN THE NEXT 6 HOURS. HEAVY RAIN AND
SQUALLY THUNDERSTORMS. FLOODING INCLUDING SEA FLOODING OF LOW LYING
COASTAL AREAS. PHENOMENAL SEAS. DAMAGING HEAVY SWELLS.

FOR THE TONGATAPU GROUP:
EXPECT DAMAGING GALE FORCE WINDS WITH AVERAGE SPEED OF 40 KNOTS AND
MOMENTARY GUSTS TO 55 KNOTS. RAIN, HEAVY AT TIMES AND SQUALLY
THUNDERSTORMS. FLOODING INCLUDING SEA FLOODING OF LOW LYING COASTAL
AREAS. HIGH SEAS. DAMAGING HEAVY SWELLS.

FOR THE REST OF TONGA:
CLOCKWISE WINDS 20 TO 25 KNOTS, GUSTING TO 40 KNOTS. OCCASIONAL RAIN
AND SQUALLY THUNDERSTORMS. ROUGH TO VERY ROUGH SEAS. MODERATE TO
HEAVY SWELLS.

Tropical Cyclone Scales

Aus Cyclone scale -s
Australian Tropical Cyclone Intensity Scale. Copyright: FIRE-EARTH Blog.

Southwest Indian Ocean
Very Intense Tropical Cyclone: sustained winds  >115 kt  (>212 km/h)
Intense Tropical Cyclone: sustained winds of 90–115 kt (166–212 km/h)
Tropical Cyclone:  sustained winds of 64–89 kt (118–165 km/h)
Severe Tropical Storm: winds of 48–63 kt (89–117 km/h)
Moderate Tropical Storm:  winds of 34–47 kt (63–88 km/h)
Tropical Depression: wind of 28–33 kt (51–62 km/h)
Tropical Disturbance: winds <28 kt ( <50 km/h).

Related Links

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IAN Threatens Tonga with Cat 4 Hurricane Winds

Posted by feww on January 10, 2014

Severe Tropical Cyclone IAN moving toward Vava’u island chain, Tonga

Severe Tropical Cyclone IAN (Tropical Cyclone 07P) was packing sustained winds of about 175 km/h at 02:00UTC on Friday, January 10, 2014, with wind gusts of about 215 km/h moving ESE at about 10 km/h.

IAN could strike Vava’u with destructive winds by as early as 03:00UTC on Saturday, January 11.

IAN-WV
Severe Tropical Cyclone  IAN. Water Vapor [FIRE-EARTH Enhancement] Satellite Image. Recorded at 01:52UTC on Friday, January 10, 2014.  Initial Image Sourced from: CIMSS/SSEC/WISC.

Severe Tropical Cyclone IAN
Time: 02:00UTC Friday January 10, 2014
Position: Near 17.5ºS, 175.3ºW
Location: 655km East (84 degrees) of Suva, Fiji
Movement: ESE at 10 km/h
Max Sustained Winds: 175 km/h
Max wind Gusts: 225 km/h
Max Significant Wave Height: 8m
Source: Various Satellites

Note: Category 4 Cyclone has average sustained winds of 159km/h (86 kt) – 198km/h (107kt) and a central pressure of 945-910 hPa.

See also: FEWW New Hurricane Scale

Posted in Climate Change, Global Disaster watch, Significant Event Imagery, significant events | Tagged: , , , , | Leave a Comment »

Cyclone RENE (TC 15P) Update 4 (14 Feb)

Posted by feww on February 14, 2010

RENE Headed Toward Tonga

At its current intensity and forecast track, Cyclone RENE could cause major damage to Tonga Isls.

Cyclone RENE could strike Hunga Island, the smaller islands to its SSW, and cause major damage to Tongatapu and Eua Islands.

An archipelago in the S. Pacific Ocean, Tonga is located south of Western Samoa. Its 176 islands (only 36 of them inhabited) are divided into three main groups: Vava’u, Ha’apai, and Tongatapu). The largest island, Tongatapu, covers about 258 sq. km (~ 100  sq. mi) and is home to the capital city of Nukuʻalofa.

The island of Niue must already be experiencing some of the peripheral forces of RENE, as it passes by.


Tropical Cyclone RENE – IR-WV Difference Satellite Image – Source: UW-CIMSS. Click image to enlarge.


Map of Tonga Island Groups. Source: USGovt. Click image to enlarge.

Background:

Tropical Cyclone RENE (TC 15P) Details

  • Date/Time: 14 February 2010 –  01:00 UTC
  • Position:  Near 16.5ºS, 171.0ºW
  • Sustained Movement: 215  degrees
  • Forward speed: 22 km/hr (~ 12 kt)
  • Tropical Cyclone RENE has been tracking  SOUTHWEST over the past 6 hours.

Current Wind Distribution:

  • Maximum Sustained winds: ~ 175km (~ 95 kt)
  • Maximum Gusts:  ~ 230 km/hr (~ 125 kt)
  • RENE is now a Cat 2B Hurricane on FEWW New Hurricane Scale and could further strengthen to  Cat 3B on the scale in the next 24 hours.

Wave Height and Location:

  • Maximum significant wave height: ~ 9m (27 ft)
  • Location: TC RENE was located about 240 km (~ 130 NM) SSW of Pago-Pago
  • Sources: CIMSS, JTWC and Others

Additional Satellite Imagery

NOAA East Pacific Floater 1 GOES Satellite ImageryCyclone FIFTEEN (TC 15P)

See also: UW- CIMSS Cyclone Portal

Related Links:

Posted in Cyclone RENE, Cyclone RENE Update 4, RENE Update feb 14, South Pacific, TC 15P | Tagged: , , , , , , , , , , , , | 3 Comments »