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. 2015 May 26;2:150024. doi: 10.1038/sdata.2015.24

Table 2. Definition of levels of warming included in the Warming Index product from the values of standardized anomalies.

Standardized anomaly Probability (%) Level of warming
+0.5 to +0.8 39.1 to 57.6 Abnormally
+0.8 to +1.3 57.6 to 80.4 Moderate
+1.3 to +1.6 80.4 to 89 Severe
+1.6 to +2 89 to 95.4 Extreme
+2 or high >95.4 Exceptional