TCAR - Typhoon Committee

in Localized Systems) nowcasting system agreed
reasonably well with the measurement at the nearest
rain gauge but did not serve as a good predictor
of flooding over a small catchment due to spatial
variation and time fluctuation.Further studies would
be conducted to establish a better correlation between
actual rainfall over the catchment area and flooding.
Rainfall nowcast data would be usedas an input later.
The Observatory provided the Drainage Service
Department with a forecast guidance on the likelihood
of having rainstorms (widespread and persistent
heavy rain with hourly rainfall at 30 mm or higher) in
Hong Kong in the next couple of hours to facilitate their
flood control operations.It was presented in iconic
form, with intuitive graphical content flipping between
two possible states: “(80%” or “