Drought of varying intensity occurs in almost all parts of Thailand every year due to inadequate rains during November-April. Losses due to drought during 1987-97 have been estimated at $1.44 billion. All the regions of Thailand (north, northeast, central, and southern) have been mapped with drought categories using either the radiative index or drought index by different organizations. Although there are several organizations involved in drought-related data collection and some sorts of preliminary analysis, there is no integrated system for drought monitoring or early warning. At the initiative of the Ministry of Agriculture and Cooperatives, the proposed system as explained in this chapter is a prototype early warning system for agricultural drought monitoring that integrates both vertically (all planning levels) and horizontally (all sectors). The monitoring is carried out in the time and event modes using field information, a GIS database, and remotely sensed data.

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