Precipitation index: Threshold Temporal information Spatial information Pi (Ps) Total precipitation 1mm in 24-hr Record at station level As a wet spell evolves with time information on the it is important to use preferably a starting time, ending GIS to: description: Quantitative time and duration of wet 1. Calculate the area affected by spell. Keep the the wet spell information in a 2. Locate the coordinates of the database. impact stations and the center with the peak values of the Magnitude Duration Extent Percent of total precipitation during the spell compared to Computed at station The geographical area computed the seasonal average. level which is a number based on multi-station data with of consecutive days gridding when observing satisfying the threshold. networks are dense. Another option is to use remote sensing Severity: characterizations: and model analysis. Is on duration. It should be categorized in three levels: minor, long, and very long. Additional information can be provided in terms of maximum daily total recorded during the spell.
Quantitative description: Precipitation index: Pi Threshold (Ps) Temporal information Spatial information Total precipitation 1mm in 24-hr Record at station level information on the starting time, ending time and duration of wet spell. Keep the information in a database. As a wet spell evolves with time it is important to use preferably a GIS to: 1. Calculate the area affected by the wet spell 2. Locate the coordinates of the impact stations and the center with the peak values of the characterizations: Magnitude Duration Extent Percent of total precipitation during the spell compared to the seasonal average. Computed at station level which is a number of consecutive days satisfying the threshold. The geographical area computed based on multi-station data with gridding when observing networks are dense. Another option is to use remote sensing and model analysis. Severity: Is on duration. It should be categorized in three levels: minor, long, and very long. Additional information can be provided in terms of maximum daily total recorded during the spell.
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