The computations are reinitated each year for week one using the output of the February Palmer data run. All initial data are replaced with the historical data received from the National Climatic Data Center in Asheville when available and the calculations rerun. The percent of field capacity of moisture in the soil at the end of the week. This value is the ratio of the soil moisture in the upper and lower layers to the available water capacity expressed in percent. RUN OFF Run off in inches at the end of the week.
Values indicate dry or wet conditions in the short term.
Values indicate long term conditions. A weather spell is established and the PDSI is final. For any PDSI greater than or equal to -.5, this parameter is left blank. Severe drought -4.0 and below Extreme drought Table 2 CMI values when the index increased or did not change from the previous week.