Precipitation Analysis - National Weather Service

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These pages graphically describe the short-term climatic trends of precipitation across the NWS Southern Region area of responsibility.Click here to read the original technical write-up regarding production of these graphics.

"Observed precipitation estimate" images are a composite of all daily precipitation estimates for the specified duration.
"Normal precipitation" images are derived from PRISM climate data. ¹ ² The PRISM gridded climate maps are considered the most detailed, highest-quality spatial climate datasets currently available.
¹ CONUS data -- 2003 precipitation analysis uses PRISM data from 1961-1990. 2004 analysis uses PRISM data from 1971-2000.
² Puerto Rico PRISM data comes from a separate project by the International Institute of Tropical Forestry (Ref: Daly, C, E.H. Helmer and M. Quiñones. 2003. Mapping the climate of Puerto Rico, Vieques and Culebra. International Journal of Climatology 23:1353-1381.)
"Departure-from-Normal" images are produced by subtracting each "normal precipitation" grid cell from its "observed precipitation estimate counterpart.
"Percent-of-Normal" images are the product of dividing each "observed precipitation estimate" grid cell by its "normal precipitation" counterpart.

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