Tropical Cyclone Position

Tropical Depression NIDA at 08:00 HKT 03 December 2009

Forecast Positions and Intensities
        Date time           Position       Classification     Maximum sustained wind
08:00 HKT 04 December 2009 22.7 N 134.0 E Low Pressure Area           40 km/hour

Past Positions and Intensities
        Date time           Position       Classification     Maximum sustained wind
08:00 HKT 03 December 2009 21.7 N 134.2 E Tropical Depression         45 km/hour
20:00 HKT 02 December 2009 21.0 N 135.0 E Tropical Storm              75 km/hour
08:00 HKT 02 December 2009 21.2 N 137.2 E Severe Tropical Storm      110 km/hour
20:00 HKT 01 December 2009 20.8 N 137.6 E Typhoon                    120 km/hour
08:00 HKT 01 December 2009 20.3 N 138.3 E Typhoon                    130 km/hour
20:00 HKT 30 November 2009 19.9 N 139.0 E Typhoon                    145 km/hour
08:00 HKT 30 November 2009 19.6 N 139.6 E Severe Typhoon             165 km/hour
20:00 HKT 29 November 2009 19.4 N 139.2 E Super Typhoon              185 km/hour
08:00 HKT 29 November 2009 19.3 N 139.3 E Super Typhoon              185 km/hour
20:00 HKT 28 November 2009 19.2 N 139.1 E Super Typhoon              185 km/hour
08:00 HKT 28 November 2009 19.0 N 139.1 E Super Typhoon              185 km/hour
20:00 HKT 27 November 2009 18.3 N 138.9 E Super Typhoon              185 km/hour
08:00 HKT 27 November 2009 16.8 N 139.1 E Super Typhoon              205 km/hour
20:00 HKT 26 November 2009 15.7 N 139.7 E Super Typhoon              205 km/hour

Tropical Cyclone Track

The analyzed tropical cyclone positions on this table are based on Hong Kong Observatory's tropical cyclone warning for shipping issued about two hours after the time of observation. They incorporate additional information derived from surface and upper-air data and may therefore be slightly different from the real-time satellite or radar-based positions given in the hourly bulletins for public.

Accuracy in the analyzed positions is usually within 30 kilometres. Average errors in the 24, 48 and 72-hour forecast positions are of the order of 150, 250 and 350 kilometres respectively.

There can be short term erratic departures from the general direction of movement. These departures are partly due to difficulties in locating the centre of the tropical cyclone, and partly due to short term fluctuations in the direction and speed of movement of the centre.