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Department of Meteorology
University of Hawaii
Source: Hawaii Drought Monitor
HRI time series (green bars) – 27 stations from 3 islands one time or another affecting virtually every part of the state. These events often reduce crop yields, diminish livestock herds, desiccate streams, irrigation ditches and reservoirs, deplete groundwater supplies, and lead to forest and brush fires. Normalized winter (NDJFM) rainfallNino 3.4 SST anomalies (solid curve), Diamond for El Niño
Correlation coefficients between the seasonal SOI and the seasonal Hawaiian rainfall index.Quenouille’s (1952) method was used to account for the reduction of effective numbers of degrees of freedom due to persistence. One and two asterisks indicate significance at the 5 and 1 percent levels, respectively.
Winter composite of east-west vertical circulation. Longitude-height section of zonal wind and negative pressure vertical velocity (U, -ω) is averaged over 15-25°N. Shading is for statistical significance. The Hawaiian Islands are bordered approximately by two vertical lines.
0.00 to -0.99 Mild Drought
-1.00 to -1.49 Moderate Drought
-1.50 to -1.99 Severe Drought
-2.00 or less Extreme Drought
2001-02 NWS/Honolulu Forecast Office.
● NWS/Honolulu Forecast Office.Another index, the Keetch/Byram Drought Index (KBDI), has been used for the southeast U.S. over 30 years.
● The KBDI, which conceptually describes the soil moisture deficit,
is used to assess wildfire potential as part of the revised 1988
U.S. National Fire Danger Rating System.
● This index depends on daily rainfall amount, daily maximum temperature, and the mean annual rainfall.