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. Jour-nal of Climate 20(24): 6033-6044.

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

Empirical Cumulative Distribution Function

0

10

20

30

40

50

60

70

80

90

100

-4 -3 -2 -1 0 1 2 3 4

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.

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.

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.

MapNavigationTools

GIS ToolsMetadata

Comparing: - spatial layers - indices - months/weeks/days)

Comparisons of multi-maps on one screen

Displaying map/graph and table on one screen

Output Options

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

Structure

• ACIS– Applied

Climate Information System

• NWIS– National Water

Information System

• ECMAScript– Standardized

JavaScript• PHP

– PHP: Hypertext Preprocessor

• SVG– Scalable Vector

Graphics