Colliers Orientation Guide
T1 - If a typhoon is within 800km of Hong Kong.
T3 - Strong wind is expected or blowing generally in Hong Kong near sea level, with a sustained speed of 41- 62 km/h (kilometres per hour), and gusts which may exceed 110 km/h, and the wind condition is expected to persist. Winds are normally expected to become generally stronger in Hong Kong within 12 hours after the issue of this signal. Winds over o shore waters and on high ground may reach gale force.
T9 - Indicates either a direct hit or a very strong typhoon is in progress. T9 signals are rare.
T10 - Hurricane force winds are in effect, sustained wind speeds of 118 km/h and gusts may exceed 220 km/h.
Amber - heavy rain of 30 mm an hour or above is falling and is expected to continue.
Red - heavy rain of 50 mm an hour is falling and expected to continue.
Black - heavy rain of 70 mm or more is falling most likely resulting in flooding.