The authors propose a new climatic drought index: the standardized precipitation evapotranspiration index (SPEI). The SPEI is based on precipitation and temperature data, and it has the advantage of combining multiscalar character with the capacity to include the effects of temperature variability on drought assessment. The procedure to calculate the index is detailed and involves a climatic wa...

Drought indices are used to identify and monitor drought events. The standardized precipitation evapotranspiration index (SPEI) is a widely based on accumulated water balance. There is, however, no broad consensus which probability distribution the most appropriate for balances. This issue investigated Ethiopia using 125 meteorological stations spread across country. Based long-term series, sel...

The ever-increasing need for water, the alteration in climate, and its observed changes over recent years have triggered a lot of research studies associated with phenomenon drought. Within wider geographical region Mediterranean, relevant scientific subject seems to be great interest, since it is undoubtedly related number severe socio-economic consequences. This present effort focuses on evol...