The 24-month Standardized Precipitation Index (SPI-24) is an indicator used to monitor meteorological drought based on precipitation anomalies over 24-month accumulation periods. SPI-24 serves as a proxy indicator for long-term impacts, such as reduced reservo...

The 12-month Standardized Precipitation Index (SPI-12) is an indicator used to monitor meteorological drought based on precipitation anomalies over 12-month accumulation periods. SPI-12 serves as a proxy for medium-term impacts, such as reduced stream flow and...

The 48-month Standardized Precipitation Index (SPI-48) is an indicator used to monitor meteorological drought based on precipitation anomalies over 48-month accumulation periods. SPI-48 serves as a proxy indicator for long-term impacts, such as reduced reservo...

The 9-month Standardized Precipitation Index (SPI-9) is an indicator used to monitor meteorological drought based on precipitation anomalies over 9-month accumulation periods. SPI-9 serves as a proxy indicator for medium-term impacts, such as reduced stream fl...

The 6-month Standardized Precipitation Index (SPI-6) is an indicator used to monitor meteorological drought based on precipitation anomalies over 6-month accumulation periods. SPI-6 serves as a proxy for medium-term impacts, such as reduced stream flow and res...

The 1-month Standardized Precipitation Index (SPI-1) is an indicator used to monitor meteorological drought based on precipitation anomalies over 1-month accumulation periods. SPI-1 serves as a proxy indicator for immediate impacts of droughts such as reduced ...