Low End
Expected
High End
Exceedance Probabilities
| At least 0.01 inches | |
| At least 0.1 inches | |
| At least 0.25 inches | |
| At least 0.5 inches | |
| At least 0.75 inches | |
| At least 1 inch | |
| At least 1.25 inches | |
| At least 1.5 inches | |
| At least 2 inches | |
| At least 3 inches | |
| At least 4 inches | |
| At least 6 inches | |
| At least 8 inches | |
| At least 12 inches | |
| At least 18 inches |
Welcome to the Probabilistic Precipitation Portal, a resource provided by the National Weather Service (NWS) to communicate the range and probability of possible precipitation amounts over the next 72 hours (3 days).
Data on this page are based on the NWS National Blend of Models (NBM), a combination of various numerical weather prediction models that create a skillful and consistent starting point for weather forecasts. National Weather Service forecasters provide the official NWS forecast, shown on this page as the "Expected Amount", and the remaining probabilities come from the NBM. In the case that NBM probabilities are inconsistent with the "Expected Amount", the probabilities are adjusted to ensure that they align with the official NWS forecast.
This page updates each hour, typically by 20 minutes past the hour.
Information about the gridded files produced by the PPP can be found in the link below
PPP GRIB2 and Geotiff_Information.pdfDeveloped at the Weather Prediction Center, part of the National Centers for Environmental Prediction (NCEP) and the National Weather Service.
To provide feedback please contact wpcservices@noaa.gov.
