The Drought Observatory is a collection of maps and other figures that monitor drought at present, near furture and in the recent past. The maps and figures can be manipulated and are linked to the original data. Even if you are primarily interested in data rather than figures, this is a good place to see which datasets are particularly useful for monitoring current conditions

Indicator

Standardized Precipitation Index (SPI), 1979 - present

Reservoirs levels,

Normalized Difference Vegetation Index (NDVI), 2000 - 2017

Water balance,

Combined Drought Indicator (CDI)