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30 Year PRISM Normals Have Been Updated

The precipitation images, shapefiles and downloads have been reprocessed utilizing the updated 1981-2010 PRISM normals. Read More...

Notice: New features, functions, and enhancements to AHPS pages as of 8/11/2015. Click here for details

The precipitation generation is currently processing November 26, 2015 UTC and began at November 28, 2015 - 00:00 UTC.

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Long-Range River Flood Risk
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QPE: Quantitative
Precipitation Estimates
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Precip Analysis
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Data for the entire country are usually available by 12:30 pm Eastern Time (9:30 am Pacific Time).

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