Region:
Year/Month
It is noted that the SPI value with -9999 (9999) will be displayed in the case of extreme low (high) precipitations where occurrence frequencies of such event are significantly small during a certain period. "Occurrence frequencies are significantly small" means cumulative probability equals zero (one) or is very close to zero (one).
Tokyo Climate Center, Climate Prediction Division.
Copyright(C) 2002. Japan Meteorological Agency.
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