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Table 3 Drought intensity at different time scale for GWB during 1901–2002

From: Spatial and temporal appraisal of drought jeopardy over the Gangetic West Bengal, eastern India

Lag time Observed Peak Intensity (PID) During 1901–2002 Mean Intensity (MID)
SPI (D Scale) Year Month
3-month −3.72 (D3) 1999 April −2.68 (gross avg. −0.81)
12-month −2.83 (D3) 1939 June −1.68 (gross avg. −0.77)
24-month −2.62 (D3) 1968 January −2.13 (gross avg. −0.81)
48-month −2.43 (D3) 1968 May −1.49 (gross avg. −0.79)