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Cooperative Institute for Research in Environmental Sciences <br />UNIVERSITY OF COLORADO BOULDER and NOAA <br />•Tukey plotting position – non-parameteric <br />•Recommended for comparing drought indices (Hao and AghaKouchak, 2014) <br />•t is period during which E0 is observed. <br />o e.g., t for 2-month EDDI on Jan 31, 2015 starts on Dec 1, 2014. <br />P(E0t )=it E0t()-0.33 <br />n +0.33 ~N(0,1) <br />rank in <br />climo <br /># years in climo <br />(37: 1980-2016) <br />CDF <br />matching <br />Hobbins et al., JHM, 2016 <br />ED0: 0.524, > 70%ile <br />ED1: 0.841, or > 80%ile <br />ED2: 1.282, or > 90%ile <br />ED3: 1.645, or > 95%ile <br />ED4: 2.054, or > 98%ile <br />EW0: -0.524, < 30%ile <br />EW4: -2.054, or < 2%ile <br />EW1: -0.841, or < 20%ile <br />EW3: -1.645, or < 5%ile <br />EW2: -1.282, or < 10%ile <br />[Hobbins et al., JHM 2016] <br />[McEvoy et al., JHM 2016] EDDI < 0 EDDI > 0 <br />wetter than normal drier than normal 0 <br />ET0 reanalysis in drought monitoring <br />Evaporative Demand Drought Index (EDDI)