2. Daily (computed on a daily basis): total 5 indices Daily maximum, minimum, mean temperature Daily total precipitation KBDI (Keetch-Byram Drought Index) Weekly (computed on a weekly basis): total 43 indices Weekly, biweekly, monthly average maximum, minimum, mean temperature Weekly PDSI, PHDI, PMDI Estimated Monthly PDSI, PHDI, PMDI Monthly (4-weeks) PDSI, PHDI, Z–Index, PMDI * CMI (Crop Moisture Index) 1–, 2– week, 1–, 3–, 6–, 9–, 12–, 24–month SPI 1–, 2– week, 1–, 3–, 6–, 9–, 12–, 24–, 60–month total precipitation 1–, 2– week, 1–, 3–, 6–, 12–, 24–month total streamflow Monthly (computed on a monthly basis): total 24 indices Monthly average maximum, minimum, mean temperature Monthly PDSI, PHDI, Z–Index, PMDI 1–, 3–, 6–, 9–, 12–, 24–month SPI 1–, 3–, 6–, 12–, 24–, 60–month total precipitation 1–, 3–, 6–,12–, 24–month average daily total streamflow * Rhee, J. and G.J. Carbone. A Comparison of Weekly Monitoring Methods of the Palmer Drought Index. Journal of Climate 20(24): 6033-6044.

3. Percentiles Using Empirical Cumulative Distributions Total 55 years (1950 ~ 2004) Palmer indices and SPI: all stations, all months Streamflow and precipitation: each station, each month Raw data: - 0.75 Percentile: 22.78 Steinmann, A. 2003. Drought indicators and triggers: A stochastic approach to evaluation. Journal of the American Water Resources Association 39: 1217–1233.

4. Interpolation 4 km X 4 km grids Available weather stations within a fixed radius circle (i.e. 50 km) Inverse Distance Weighted; Kriging No data Rhee, J., G. J. Carbone, and J. Hussey. 2008. Drought index mapping at different spatial units. Journal of Hydrometeorology DOI: 10.1175/2008JHM983.1.

6. Aggregation Rhee, J., G. J. Carbone, and J. Hussey. 2008. Drought index mapping at different spatial units. Journal of Hydrometeorology DOI: 10.1175/2008JHM983.1.

7. Map Navigation Tools GIS Tools Metadata

12. Comparing: - spatial layers - indices - months/weeks/days) Comparisons of multi-maps on one screen

13. Displaying map/graph and table on one screen

14. Output Options - Scalable vector graphics (SVG) - Arc shapefiles - Google Earth overlay (& KML export) - Excel spreadsheets (for tables)

25. Structure ACIS – Applied Climate Information System NWIS – National Water Information System ECMAScript – Standardized JavaScript PHP – PHP: Hypertext Preprocessor SVG – Scalable Vector Graphics