Category 5 cyclone Yasi is going to land near Innisfail, Queensland around 11 pm tonight. It is in the middle of Cairns to Townsville. Government has ordered people in the region to evacuate to safer place instead of staying home. I just hope that it won't cause too many severe damage, but the strong wind, heavy rain and tidal surge. Sigh! <Ref links> 1. Basic information about category 1 to 5 on wiki
Tropical systems are officially ranked on one of several tropical cyclone scales according to their maximum sustained winds and in what oceanic basin they are located. Only a few scales of classifications are used officially by the meteorological agencies monitoring the tropical cyclones, but some alternative scales also exist, such as Accumulated Cyclone Energy, the Power Dissipation Index, the Integrated Kinetic Energy Index, and Hurricane Severity Index. Should a tropical cyclone form in the North Atlantic Ocean or the North-eastern Pacific Ocean, it will be classified using one of the categories in the Saffir-Simpson Hurricane Scale. In the Western Pacific, tropical cyclones will be ranked using the Japan Meteorological Agency's scale. The Regional Specialized Meteorological Centre (RSMC) in New Delhi, India also uses a different scale to assess the maximum sustained winds of a tropical cyclone. In the Southern Hemisphere, the Météo-France forecast center on La Reunion uses a scale that covers the whole of the South West Indian Ocean. Both the Australian Bureau of Meteorology and the RSMC in Nadi, Fiji use the Australian tropical cyclone intensity scale.
AustraliaAny Tropical Cyclone that forms to the east of 90°E in the Southern Hemisphere, is monitored by either the Australian Bureau of Meteorology and or the Regional Specialized Meteorological Center in Nadi, Fiji.[4] Both warning centres use the Australian tropical cyclone intensity scale, which measures tropical cyclones using a six category system.[4] It is based on estimated maximum windgusts, which are a further 30-40% stronger than the 10-minute average sustained winds. This is different from the Saffir-Simpson Hurricane Scale, which uses 1-Minute Maximum Sustained winds.[1] When a Tropical Cyclone that has wind speeds below 35 knots (65 km/h, 40 mph) forms east of 160°E it is labelled as either a Tropical Disturbance or a Tropical Depression by RSMC Nadi.[4] If it forms to the west of 160°E it is labelled as a Tropical Low by the Australian Bureau of Meteorology.[4] However if it forms to the north of 10°S and between 90°E to 125°E the low is labelled as a Tropical Depression by the Tropical Cyclone Warning Center in Jakarta, Indonesia.[18] If a tropical depression should reach 35 knots (65 km/h, 40 mph), it will be named by the TCWC or RSMC and be classified as aTropical Cyclone.[19] Should the cyclone intensify further reaching maximum sustained winds of 65 knots (145 km/h, 75 mph) then the cyclone will be designated as a Category Three Severe Tropical Cyclone.[19] A Severe Tropical Cyclone will be classified as a Category Five Severe Tropical Cyclone should the cyclone's maximum sustained wind speed be greater than 110 Knots (200 km/h, 130 mph) and gusts be above 150 knots (280 km/h, 175 mph).[19] ![]() ![]() ![]() 4. The information from AUSTRALIAN GOVERNMENT BUREAU OF METEOROLOGY - TROPICAL CYCLONE WARNING CENTRE BRISBANE(Issued at 6:04 pm EST Wednesday 2 February 2011. Refer to Tropical Cyclone Advice Number 18. )
The outermost boundary of the winds shown in the Coral Sea represent strong gale force (41kt) winds. Elsewhere gale force (34kt) winds are shown. The forecast path shown above is the Bureau's best estimate of the cyclone's future movement and intensity. There is always some uncertainty associated with tropical cyclone forecasting and the grey zone indicates the range of likely tracks of the cyclone centre. Due to the uncertainty in the future movement, the indicated winds will almost certainly extend to regions outside the rings on this map. The extent of the warning and watch zones reflects this. This product is designed for land-based communities; mariners should read the coastal waters and high seas warnings. Remarks: SEVERE TROPICAL CYCLONE YASI IS A LARGE AND VERY POWERFUL TROPICAL CYCLONE AND POSES AN EXTREMELY SERIOUS THREAT TO LIFE AND PROPERTY WITHIN THE WARNING AREA, ESPECIALLY BETWEEN CAIRNS AND TOWNSVILLE. People between Cape Flattery and Sarina and extending west across the tropical interior to the Northern Territory border, should complete preparations quickly and be prepared to shelter in a safe place. Name: Severe Tropical Cyclone Yasi Details:
The next Forecast Track Map will be issued by 7:00 pm EST Wednesday |
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