Palmer Drought Index
A definition of the Palmer Drought index from the National Climatic Data Center
The Palmer Drought Severity Index (PDSI) (known operationally as the Palmer Drought Index (PDI)) attempts to measure the duration and intensity of the long-term drought-inducing circulation patterns. Long-term drought is cumulative, so the intensity of drought during the current month is dependent on the current weather patterns plus the cumulative patterns of previous months. Since weather patterns can change almost literally overnight from a long-term drought pattern to a long-term wet pattern, the PDSI (PDI) can respond fairly rapidly.
Current Palmer Drought Index values for Pennsylvania from the USGS Water Resources of Pennsylvania
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Current PDI values are indicated by the color of the circle inside each county:
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For National Palmer Drought Information, go to the Climate Prediction Center and for archived data from the last three weeks visit their Palmer Drought Index page
Crop Moisture Index
A definition of the Crop Moisture index from the National Climatic Data Center
The Palmer Crop Moisture Index (CMI) measures short-term
drought on a weekly scale and is used to quantify drought's impacts on agriculture
during the
growing season.
Current Crop Moisture Index values for the US from the Climate Prediction Center
Evapotranspiration Data
For Evapotranspiration information in text form click here
Precipitation Totals
| Past 30 Days
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Past 90 Days
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