1. 評估前 

天氣狀況 應變措施
日間評估
天文台在上午6時15分至中午12時前發出八號或以上熱帶氣旋警告信號或黑色暴雨警告信號 當日上午9時至下午6時舉行的所有日間評估將會取消。
夜間評估
天文台在中午12時或以後發出八號或以上熱帶氣旋警告信號或黑色暴雨警告信號 當日下午6時至晚上10時舉行的所有夜間評估將會取消。

2. 評估期間

天氣狀況 應變措施
八號或以上熱帶氣旋警告信號生效 有關評估將即時停止。
黑色暴雨警告信號生效 有關評估仍會繼續進行,直至完結為止。

1. Before assessment

Weather condition Contingency measures
Day-time assessment
Tropical Cyclone Warning Signal no.8 or above, or Black Rainstorm Signal is issued by The Observatory before 6:15 a.m. and 12:00 noon All daytime assessments scheduled between 9:00 a.m. to 6:00 p.m. on that day will be cancelled.
Evening assessment
Tropical Cyclone Warning Signal no.8 or above, or Black Rainstorm Signal is issued by The Observatory at 12:00 noon or after All evening assessments scheduled between 6:00 p.m. to 10:00 p.m. on that day will be cancelled.

2. During assessment

Weather condition Contingency measures
Tropical Cyclone Warning Signal no.8 or above is in force Assessment will be terminated immediately.
Black Rainstorm Signal is in force Assessment will continue until the end