Skip to main content
Hong Kong Observatory Brand Hong Kong - Asia's world city
GovHK Text Only Traditional Chinese Simplified Chinese Search
Search Site Map Contact Us
Print Version
Print Version

Icon of System (GIS) version Geographic Information
System (GIS) version

Tropical Depression RAMMASUN
at 05:00 HKT 20 July 2014

Position: 23.2 N, 104.6 E
Maximum sustained wind near centre: 45 km/h

Tropical Cyclone Track at 05:00 HKT 20 July 2014

Forecast Positions and Intensities

Date timePositionClassificationMaximum sustained wind near centre
05:00 HKT 21 July 201423.2 N100.5 ELow Pressure Area40 km/h

( Past Positions and Intensities )


  • The symbol low pressure area symbol will be displayed when the tropical cyclone is expected to weaken into a low pressure area or transform into an extratropical low.
  • Past track is in black, forecast track is in red.
  • The accuracies, based on average errors, of the latest analysed and forecast positions are of the order of:

    Analysed Position30 km
    24-hour forecast position150 km
    48-hour forecast position250 km
    72-hour forecast position350 km

  • The centres of the red, blue and grey circles are the forecast positions of the tropical cyclone at different times (as shown at the upper left corner of the figure). The radii of the circles are the respective accuracies.
  • when an area of low pressure intensified into a tropical cyclone, the Observatory will issue the information of tropical cyclone track, analysed positions and maximum sustained wind near centre within two hours. It will be updated twice daily at around 10 a.m. and 10 p.m. about two hours after the time of observation. When the tropical cyclone is expected to enter the area bounded by 10N and 30N, 105E and 125E in about 24 hours, the Observatory will also update the tropical cyclone track at 04:00 and 16:00 Hong Kong time (corresponding to the observation time at 02:00 and 14:00 respectively).
  • The past tropical cyclone track, analysed positions and maximum sustained wind near centre may be updated when additional data is received.
  • Short-term erratic departures of the tropical cyclone from the general direction of movement may occur from time to time. These departures are partly due to uncertainties in locating the centre of the tropical cyclone, and partly due to actual short-term variations in the direction and speed of movement of the tropical cyclone itself.
Last revision date: <20 Jul 2014>