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Time Series Graph
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Extreme Rainfall
- Heavy Rainfall Criterion
The heavy rainfall criterion is the top 10% precipitation intensity (90th percentile) over the 22 years (April 2000 to March 2022).
- Extreme Rainfall
An area where "mean rainfall amount exceeds the criterion" and "the heavy rainfall criterion is 1 mm/day or more" is colored as an area of extreme rainfall. The value is the corresponding from 90th to 99th percentile values.
Drought Index (SPI)
Standardized Precipitation Index (SPI) is a drought index that is able to calculate using only precipitation. The larger the negative value, the stronger the drought tendency.
【Drought classification】
| Moderate Drought: | -0.8 | to | -1.2 |
| Severe Drought: | -1.2 | to | -1.5 |
| Extreme Drought: | -1.5 | to | -2.0 |
| Exceptional Drought: | -2.0 | or | less |
【Reference】
NOAA/CPC Drought Indices Web site
https://www.cpc.ncep.noaa.gov/products/Drought/Monitoring/spi.shtml
【Acknowledgment】
The SPI calculation program was provided by NOAA/CPC.
Statistics
The long-term average of precipitation (statistics period: April 2000 to March 2022). The unit is [mm / day].