ABRFC Monthly Precipitation Images - National Weather Service
Monthly/Annual Precipitation Products
These pages graphically describe the monthly and annual precipitation across the ABRFC area of responsibility.
"Observed precipitation estimate" images are a composite of all daily precipitation estimates for the specified duration. Since December 1997 the ABRFC has used Process 1 (P1) almost exclusively to create these precipitation estimates.
"Normal precipitation" images are reprojections of PRISM climate data. These gridded climate maps are considered the most detailed, highest-quality spatial climate datasets currently available.
"Percent-of-Normal" images are the product of dividing each "observed precipitation estimate" grid cell by its "normal precipitation" counterpart.