Both the Australian Bureau of Meteorology and the RSMC in Nadi, Fiji use the Australian tropical cyclone intensity scale.
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Any tropical cyclone that develops within the Northern Hemisphere between 180° and 100°E is monitored by the Japan Meteorological Agency's Regional Specialized Meteorological Center in Tokyo, Japan, on behalf of the WMO/ESCAP's Typhoon Committee.
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Any 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.
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Peaking as a Category 4 cyclone, and making landfall as a Category 2, it caused significant damage in the Cairns region which it approached on two occasions.It was the largest cyclone to hit Northern Queensland in 1997.
Early on 22 April 2006, the Bureau of Meteorology (BoM) assessed Monica to have attained Category 5 status, on the Australian cyclone intensity scale.
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The storm quickly developed into a Category 1 cyclone the next day, at which time it was given the name Monica.