- Isolated: Showers which are well separated in space (i.e. generally covering less than 10% of the total area) during a given period.
- Widely scattered: Means the precipitation areas are displaced a considerable distance from each other
(Covering 10 – 30% of the total area)
- Scattered: Irregularly distributed over an area (i.e. generally covering 30 to 60% of the total area). Showers which, while not widespread, can occur anywhere in an area. Implies a slightly greater incidence than isolated.
- Widespread: Occurring extensively throughout an area (i.e. generally covering over 60% of total area).
A small craft advisory must be issued whenever the state of the sea is expected to be “Rough or greater” (8 feet or more) within the forecast period.
Flash flood: A flood of which peak appears within, in general, six hours from the onset of torrential rainfall and confined to relatively small and poorly drained areas.
Landslide: Down slope movement of soil mass under the influence of precipitation, ground water and other causes.