Confirmed COVID-19 cases for Italy and New York State, from January 22, 2020, until April 13, 2021, are in Figures 1 and 2, respectively. Red dots correspond to time points that an early warning was issued according to \(Ind_{EVI_{t,t-1}}\), while grey dots to time points without an early warning indication. Further, the positive and negative predictive values at each time point are in Figures 3 and 4, respectively.